Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

The Sebaou river valley (SRV) is located in the northern Tell region of Algeria, and is a significant source of ground and surface waters because of its geographical context within the northern Algerian Tell region. The water resources from the study area are important for both local people and environmental scientists since the area is undergoing significant industrial development. Therefore a quantitative and qualitative study of the surface and groundwater can help us to establish the current physico-chemical variables of the water resources, allowing comparisons with future studies. In this study we present the most comprehensive survey of the hydrogeological properties of this region reported to date, including the spatio-temporal variation of physico-chemical variables as studied by principal component analysis. This method allowed us to confirm the principal chemical facies and to differentiate the waters of the middle and upper Sebaou river from the waters of river tributaries, specifically the Aissi and Bougdoura rivers. The quality of these water resources is declining as a result of local development and so this study is expected to provide a valuable resource for future water management strategies in the region.

DOI： 10.1016/j.ejrh.2017.04.002

Language：English   Publishing type：Research paper (other academic)  

Language：English   Publishing type：Research paper (scientific journal)  

We report the first example of a μ-η¹:η¹-N₂ dinuclear Ru^II complex with a polyamine ligand and elucidate the structure by means of X-ray analysis. The N=N stretching vibration has been observed at 1994 cm^-1 by Raman spectroscopy, which is the lowest value of all the known N₂-coordinated RuII complexes. This low value strongly suggests the N=N bond is primed for activation.

DOI： 10.1246/cl.151004

Language：English   Publishing type：Research paper (scientific journal)  

We report the first example of a wholly inorganic mimic of a part of the FeMoco active centre of nitrogenases. We detail the synthesis, characterisation and reactivity of two related, transient hydride-containing inorganic clusters, a dihydride complex and a vinyl monohydride complex, which bear the [Fe₂MoOS₃] portion of FeMoco. The dihydride complex is capable of reducing acetylene to ethylene via the vinyl monohydride complex. In the reaction cycle, a transient low-valent complex was generated by the reductive elimination of H₂ or ethylene from dihydride or vinyl monohydride complexes, respectively.

DOI： 10.1039/c6dt01655c

Language：English   Publishing type：Research paper (scientific journal)  

Here, we report the first Fe-based model for metabolism linking between the dioxygen reduction of respiration and the water oxidation of photosynthesis. The reaction mechanism was investigated by X-ray analysis, UV-vis spectroscopy, and mass spectrometry.

DOI： 10.1246/cl.150468

Language：English   Publishing type：Research paper (scientific journal)  

Herein, we report a [NiRu] biomimetic system for O ₂-tolerant [NiFe]hydrogenases and demonstrate that electron donation to the [NiRu] center can switch the system between the activation of H ₂ and O ₂ through simple ligand effects by using hexamethylbenzene and pentamethylcyclopentadienyl ligands, respectively. Furthermore, we present the synthesis and direct observations of a [NiRu]-peroxo species, which was formed by the oxygenation of a Ni-SIa model [NiRu] complex, that we propose as a biomimetic analogue of O ₂-bound species (OBS) of O ₂-tolerant [NiFe]hydrogenases. The [NiRu]-peroxo complex was fully characterized by X-ray analysis, X-ray photoelectron spectroscopy (XPS), mass spectrometry, and ¹H NMR spectroscopy. The OBS analogue was capable of oxidizing p-hydroquinone and sodium borohydride to turn back into the Ni-SIa model complex.

DOI： 10.1002/asia.201101020

Language：English   Publishing type：Research paper (scientific journal)  

This review discusses the development of aqueous phase, homogeneous, transfer hydrogenation catalysis. Transfer hydrogenation catalysts, based on Ru, Ir and Rh, reduce organic substrates in water by assisting the transfer of hydrogen from simple donor species. These catalysts are expected to have significant benefits when compared with organic phase catalysts, including greater activity, greater selectivity and smaller environmental impact. They will therefore be expected to make a significant contribution to homogeneous catalysis and 'green chemistry'. Here, we comprehensively examine these catalysts, paying special attention to structural features.

DOI： 10.1039/c1dt10544b

Language：English   Publishing type：Research paper (scientific journal)  

A benzocrown-appended lanthanum(III) porphyrin double decker has been synthesized which is capable of binding simple K⁺ in a cooperative, allosteric fashion to form a 1:4 complex. Analysis of this system by means of the Hill equation gave an overall binding constant (K_b) of 1.0 × 10¹⁴ (mol dm^-3)^-4 and a Hill coefficient of 4.0. This same system, however, binds Na⁺ in a conventional, linear fashion. These results indicate that the novel allosteric binding occurs as the result of 1:2 sandwich complexes between K⁺ and appended crown ether moieties of the two joined porphyrins. The suitability of lanthanum(III) over cerium(IV) for preparing this highly crowded double decker porphyrin is also noted.

DOI： 10.1246/bcsj.74.883

Language：English   Publishing type：Research paper (scientific journal)  

Examples of chemical systems capable of templating and catalysing their own synthesis - self-replicating systems -have begun to appear in the chemical literature over the last 15 years. For the biologist, these systems represent a link with the origin of life - their study can shed light on prebiotic chemical evolution. However, for the synthetic chemist, they represent the ultimate synthetic machine, capable of templating the production of a large number of perfect copies of themselves from a single original molecule. In this Review, we describe the design and synthesis of synthetic minimal replicating systems and provide a general overview and critique of the field.

DOI： 10.1039/a803602k

Language：English   Publishing type：Research paper (scientific journal)  

This article is concerned with the incorporation of cooperative molecular recognition and metal ion coordination in the design of selective sensors that signal binding events through their optical properties. Sensors that rely on non-specific hydrophobic effects are first considered before looking at the use of specific, directed intermolecular interactions to achieve greater specificity and chiral discrimination. The natural development of the same design concepts to produce catalysts and actuating devices with similar discriminatory abilities is also discussed.

DOI： 10.1016/s0010-8545(00)00243-5

Language：English   Publishing type：Research paper (scientific journal)  

Cerium(IV) double decker porphyrins bearing one-to-four pairs of 4-pyridyl groups (3a, 3a′, 3bp, 3bd, 3c, and 3d) were synthesized from tetraarylporphyrins bearing mono-, bis-, tris-, and tetrakis(4-pyridyl) groups. In 3b bearing two pairs of 4-pyridyl groups, there exist two isomers in which the 4-pyridyl groups are either proximal or distal (3bp and 3bd, respectively). In a mixed solvent of dichloromethane: ethyl acetate (30:1 v/v), 3a′ bearing one pair of 4-pyridyl groups and three pairs of phenyl groups did not interact with any dicarboxylic acids whereas 3d bearing four pairs of 4-pyridyl groups interacted only with dicarboxylic acid guests with a dimethylene spacer [e.g., BOC-L-aspartic acid (L-4) and (1R,2R)-cyclohexane-1,2-dicarboxylic acid ((1R,2R)-5)]. Interestingly, the complexation process monitored by CD spectroscopy showed a positive homotropic allosterism which satisfied the Hill equation giving constants K = 2.63×1011M-4 and n = 3.9 for L-4 and K = 2.75×109 M-4 and n = 4.0 for (1R,2R)-5. The continuous variation plots (Job plots) also supported the formation of the 1:4 3d/dicarboxylic acid guest complexes. The results consistently indicate that four pairs of 4-pyridyl groups in 3d allosterically bind these guests. In 3d, the two porphyrin rings can still rotate, but once the rotation is suppressed by the first guest binding, the subsequent binding of the second, third and fourth guests can occur cooperatively. This is the origin of the present positive homotoropic allosterism. A similar positive homotropic allosterism was also observed for 3bp and 3bd with n = 1.5 and 1.7, respectively and 3c with n = 3.0. The X-ray crystallographic study of the 3d·[(1R,2R)-5]4 complex showed that the two porphyrin planes are warped outward to relax the electrostatic repulsion and chirally twisted. The two carboxylic acid groups form intermolecular hydrogen bonds (but not intramolecular bridge-type hydrogen bonds) with the pyridyl groups because of the close packing effect of rigid host 3d and rigid guest (1R,2R)-5. In conclusion, this is a rare example of positive homotropic allosterism in an artificial system which is frequently seen in nature where the biological events must be efficiently regulated in response to signals.

DOI： 10.1080/10610270008029453

Language：English   Publishing type：Research paper (scientific journal)  

A cerium(IV) double decker porphyrin 2 bearing two pairs of 4-pyridyl groups and two pairs of 3,5-dimethoxyphenyl groups was synthesized. In the presence of chiral dicarboxylic acid guests with a two carbon spacer [e.g., (1R,2R)-cyclohexane-1,2-dicarboxylic acid and Boc-L-aspartic acid] 2 gave a CD-active species. The plots of the CD intensity vs. the guest concentration showed a sigmoidal curvature, a sign of homotropic, positive allosterism. Analysis according to the Hill equation indicated that the guests were bound autoacceleratively. Even after the chiral guests were removed by the addition of excess pyridine, 2 remained CD-active because of its inherent chirality. Thereafter, the CD intensity decreased very slowly as a result of internal rotation of the porphyrin subunits. Thermodynamic analysis of this racemization process gave ΔG^‡ ₂₉₈ = 23.0 kcal mol^-1, ΔH^‡ ₂₉₈ = 18.1 kcal mol^-1 and ΔS^‡ ₂₉₈ = -16.4 cal mol^-1 K^-1. Observations and calculations indicate that the chiral memory can be preserved for 3 days at 0°C and for one year at -37°C. In conclusion, this is a rare artificial system for which a homotropic, positive allosterism is observable and in which the guest chirality is transcribed and stored.

DOI： 10.1039/a904890a

Language：English   Publishing type：Research paper (scientific journal)  

A novel PET sensor for sugar sensing which changes its fluorescence intensity in an 'on-off' manner was designed from (tetraphenylporphyrinato)tin(IV).

DOI： 10.1039/a906825b

Language：English   Publishing type：Research paper (scientific journal)  

The rational design of systems which are capable of accelerating and/or controlling the stereochemical outcome of the Diels-Alder cycloaddition reaction between a furan and a maleimide is presented. The origins of the acceleration and control of the cycloaddition reactions are traced by kinetic studies - allied to molecular mechanics calculations - to the formation of complexes in which the dienes and the dieneophiles are placed in the appropriate arrangements for reaction, and, more importantly, to the formation of intramolecular hydrogen bonds in the cycloadducts.

DOI： 10.1016/S0040-4020(99)00633-X

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

The rational design of a system which is capable of controlling the stereochemical outcome of a Diels-Alder reaction between a maleimide and a furan is presented.

DOI： 10.1039/a800559a

Nitrogen is abundant in the atmosphere but it's hard to obtain.

Other Link： https://youtube.com/shorts/2jmk02EoYZU?feature=share

Response to UK junior high school students science questions.

Other Link： https://youtu.be/K8yVua3jPAM

Response to UK junior high school students science questions.

Other Link： https://youtu.be/SnE3EjSnlzA

Response to UK junior high school students science questions.

Other Link： https://youtu.be/Q39Lcn26Jtw

Response to science questions from UK junior high school students.

Other Link： https://youtu.be/9G89_7n_LpY

Other Link： https://youtube.com/shorts/Zdmx02ezUPg?feature=share

Other Link： https://youtube.com/shorts/-qCVd6F_m38?feature=share

Why beryllium is not used more often in chemistry.

Other Link： https://youtube.com/shorts/MSIBUvugmFA?feature=share

An accessible explanation of molecular orbitals with 3D animations.

Other Link： https://youtu.be/oWzuqLl6Ito

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Other Link： https://youtube.com/shorts/w7CgGOjyx8Y?feature=share

Why the second row of the periodic table is so exceptional

Other Link： https://youtube.com/shorts/QeryVKJNODI?feature=share

Hydrogen ions do not exist in isolation.

Other Link： https://youtube.com/shorts/TrEoXKjBIyc?feature=share

Why don't we hear about negative hydrogen ions?

Other Link： https://youtube.com/shorts/irrZ7fW04Dg?feature=share

HHe+ was the first ever molecule.

Other Link： https://youtube.com/shorts/TuxJgQtC6WQ?feature=share

Explaining atomic orbitals in a far more accessible, yet accurate, manner than previous explanations.

Other Link： https://youtu.be/23bNW4G9DZk

I tell the story of how a dangerous bumping incident in a laboratory made me realise how unreliable the human memory can be.

Other Link： https://youtu.be/ZMSqhiX6OXM

Short illustration of a better illustration of atomic orbitals.

Other Link： https://youtube.com/shorts/0EW9ldmM6iw?feature=share

The molecular picture of boiling.

Other Link： https://youtu.be/RlBsG1ANcCo

How beads in a sound tube can illustrate principles of electronic orbitals.

Other Link： https://youtu.be/c972t-C3PU4

Fizzy drinks are literally boiling.

Other Link： https://youtube.com/shorts/gorWGyEKkz4?feature=share

3D animations to show how interpenetrating lattices work

Other Link： https://youtube.com/shorts/uGLCJ8uKsYE?feature=share

The chemistry of moisturisers short video

Other Link： https://youtube.com/shorts/diZg5On5Ztk?feature=share

The chemistry of evaporation.

Other Link： https://youtu.be/Ybs4yLrVcvU

High pressures don't slow down evaporation

Other Link： https://youtube.com/shorts/Zbzf8RiHqPM?feature=share

3D animations of how crystals form

Other Link： https://youtube.com/shorts/E9YjFUPbNPA?feature=share

YouTube video explaining the hydrogen economy.

Other Link： https://youtu.be/NaZ-xiq7EhY

Funny video about moles in chemistry

Other Link： https://youtube.com/shorts/osXtEGk-hv0?feature=share

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Other Link： https://youtu.be/yT1-sOnihg4

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A video about the chemistry of fire.

A video about the chemistry of fire.

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Scientific Questions and Answers with the public.

Questions and answers from the public on scientific topics.

I discuss a chemistry disaster.

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A story about a chemistry disaster.

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Questions and answers from the public on scientific topics.

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Scientific Questions and Answers with the public.

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A short version of my video on making STEM presentations.

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I teach nine rules (plus a free bonus rule) for making excellent presentations on STEM topics at the international level.

Other Link： https://youtu.be/OywS3XBzaII

I explain how and why chemists use moles. Duh.

Other Link： https://youtu.be/j6mqbTwuj2E

I answer questions on the topics of:02:18 How can I make alcohol easily at home? 05:36 Why did chemists believe Mendeleev? 11:52 What is the air speed of an unladen swallow? 12:15 Why is an octopus so squishy it can fit under a door? 15:04 Someone’s homework about pollution but also why ‘useless’ lessons are so useful 20:32 Can we really call subatomic particles ‘fundamental’? 24:10 Why do opposite charges attract and like charges repel?, and 28:14 When is a chemical bond not really a bond?

Other Link： https://youtu.be/CLQ2VZgMPFw

I answer questions from students and the public on: ‘My teacher says only electrons move, so what are positive lightning strikes made of?’ and ‘If glass is made of atoms, why can we see through it? Why can’t we see through walls then?’

Other Link： https://youtu.be/4ua8-O4pZUA

‘If gravity pulls everything to the centre of the Earth, why are things like people still on the outside?/Atoms are empty space/Why don’t atoms shrink?’ 00:48 ‘What’s the difference between S/R and D/L configuration?’ 13:35 , and ‘How do I contact PhD supervisors in Japan?’

Other Link： https://youtu.be/-tU_faQ_A18

I answer questions on the topics of:02:18 How can I make alcohol easily at home? 05:36 Why did chemists believe Mendeleev? 11:52 What is the air speed of an unladen swallow? 12:15 Why is an octopus so squishy it can fit under a door? 15:04 Someone’s homework about pollution but also why ‘useless’ lessons are so useful 20:32 Can we really call subatomic particles ‘fundamental’? 24:10 Why do opposite charges attract and like charges repel?, and 28:14 When is a chemical bond not really a bond?

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‘If gravity pulls everything to the centre of the Earth, why are things like people still on the outside?/Atoms are empty space/Why don’t atoms shrink?’ 00:48 ‘What’s the difference between S/R and D/L configuration?’ 13:35 , and ‘How do I contact PhD supervisors in Japan?’

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I teach nine rules (plus a free bonus rule) for making excellent presentations on STEM topics at the international level.

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I explain how and why chemists use moles. Duh.

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I answer questions from students and the public on: ‘My teacher says only electrons move, so what are positive lightning strikes made of?’ and ‘If glass is made of atoms, why can we see through it? Why can’t we see through walls then?’

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I ask for questions on the topic of chemistry, science and life from students and the general public.

Other Link： https://youtu.be/QReSqT76NJU

I show a practical demonstration of using moles to make solutions in the laboratory.

Other Link： https://youtu.be/f8PejpAPqA4

I ask for questions on the topic of chemistry, science and life from students and the general public.

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I show a practical demonstration of using moles to make solutions in the laboratory.

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I present a complete history of the Avogadro number, going as far back as 300 BC.

Other Link： https://youtu.be/SRiNc1AA8vg

I present a complete history of the Avogadro number, going as far back as 300 BC.

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I showcase the trials and tribulations of making videos outdoors.

Other Link： https://youtu.be/Up4SFGcdA90

I showcase the trials and tribulations of making videos outdoors.

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I explain the benefits and drawbacks of the three principle theories of molecular bonding.

Other Link： https://youtu.be/kWHV-6Bl81A

I explain why some elements expand their octet.

Other Link： https://youtu.be/FKmQgpTj9ro

I explain the benefits and drawbacks of the three principle theories of molecular bonding.

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I explain why some elements expand their octet.

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I explain that the octet rule is not a rule, but rather a useful guide to understanding how atoms make molecules.

Other Link： https://youtu.be/8mndz3e15Bo

I explain that the octet rule is not a rule, but rather a useful guide to understanding how atoms make molecules.

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I explain the difference between atoms and molecules.

Other Link： https://youtu.be/f9OQu-o0Aok

I show how to design slides and practise the presentation

Other Link： https://youtu.be/y4U5LzfaO7o

I show how to design slides and practise the presentation

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I explain the difference between atoms and molecules.

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I demonstrate how to create a first draught of a presentation from the linear list of topics produced in part 1.

Other Link： https://youtu.be/A-HktR3N39k

This video contains a sketch where scientist has to explain the concept of Three Twentysix to a madman.
This video contains a sketch where scientist has to explain the concept of Three Twentysix to a madman.

Other Link： https://youtu.be/x5KqjBoz020

This video follows the process of choosing topics and a running order for a presentation.
This video follows the process of choosing topics and a running order for a presentation.

Other Link： https://youtu.be/MiA5TOK-1xc

An entertaining introduction to the Three Twentysix YouTube channel.

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I video myself preparing a presentation on sustainable development goals for an international presentation.

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I demonstrate how to create a first draught of a presentation from the linear list of topics produced in part 1.

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A brief description of my plans for the Three Twentysix channel.

Other Link： https://youtu.be/BJmh_I3M2Ks

This is a simple video to begin my YouTube channel and attract viewers.

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From 2005 to the present, several of my presentation class students have won awards for presentations in English at international conferences, despite not being native speakers.

Audience：General,　Scientific,　Company,　Civic organization,　Governmental agency

Type：Lecture

Despite its many problems, YouTube has become a useful educational tool, with videos explaining almost any topic you can choose. For educators, YouTube has the potential to reach an international audience and provide quality tuition to anyone with an internet connection, anywhere, at any time. However, the sheer number of videos on YouTube mean that it is far more likely videos will disappear with a disappointing number of views, no matter how well taught they are. This talk will discuss the many difficulties of using YouTube as an educational medium but show how, with some research, thought, and creativity, it can be used to reach out across the world.