A5003633440- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organometallic Complex Synthesis and Catalysis
- Organoboron and organosilicon chemistry
- Synthesis and characterization of novel inorganic/organometallic compounds
- Carbon dioxide utilization in catalysis
- Crystallography and molecular interactions
- Synthetic Organic Chemistry Methods
- Various Chemistry Research Topics
- Inorganic and Organometallic Chemistry
- Coordination Chemistry and Organometallics
- Chemistry and Chemical Engineering
- Fluorine in Organic Chemistry
- Innovative Teaching Methods
- History and advancements in chemistry
- Innovative Teaching and Learning Methods
- biodegradable polymer synthesis and properties
- Radioactive element chemistry and processing
- Psychology, Coaching, and Therapy
- Inorganic Fluorides and Related Compounds
- Crystal structures of chemical compounds
- Mobile Learning in Education
- Magnetism in coordination complexes
- Visual and Cognitive Learning Processes
- Online and Blended Learning
University of East Anglia
2011-2024
Norwich Research Park
2012-2024
University of Tennessee Health Science Center
2016
University of Perugia
2008
University of Southampton
2005-2008
Boreskov Institute of Catalysis
2005-2008
Lomonosov Moscow State University
2008
University of Cambridge
2005
University of Konstanz
2005
Monash Medical Centre
2000-2003
The reactive cationic 14-electron complex 2 is stabilized by formation of methyl-bridged binuclear complexes type 1 and 3. compounds are highly active catalysts for the polymerization ethylene propylene. As expected dissociation equilibrium shown, neutral alkyl metal in excess act as inhibitors; thus, activity 3 decreases significantly with increasing AlMe3 concentration.
The formation of adducts tris(pentafluorophenyl)borane with strongly coordinating anions such as CN- and [M(CN)4]2- (M = Ni, Pd) is a synthetically facile route to the bulky, very weakly [CN{B(C6F5)3}2]- [M{CNB(C6F5)3}4]2- which are isolated stable NHMe2Ph+ CPh3+ salts. crystal structures [CPh3][CN{B(C6F5)3}2] (1), [CPh3][ClB(C6F5)3] (2), [NHMe2Ph]2[Ni{CNB(C6F5)3}4]·2Me2CO (4b·2Me2CO), [CPh3]2[Ni{CNB(C6F5)3}4]·2CH2Cl2 (4c·2CH2Cl2), [CPh3]2[Pd{CNB(C6F5)3}4]·2CH2Cl2 (5c·2CH2Cl2) reported. CN...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Base-Free Cationic Zirconium Methyl and Benzyl Complexes. The Crystal Molecular Structure {C5H3(SiMe3)2-1,3}2ZrMe(.mu.-Me)B(C6F5)3Manfred Bochmann, Simon J. Lancaster, Michael B. Hursthouse, K. M. Abdul MalikCite this: Organometallics 1994, 13, 6, 2235–2243Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBase-free cationic zirconium benzyl complexes as highly active polymerization catalystsManfred Bochmann and Simon J. LancasterCite this: Organometallics 1993, 12, 3, 633–640Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1993https://pubs.acs.org/doi/10.1021/om00027a012https://doi.org/10.1021/om00027a012research-articleACS PublicationsRequest reuse permissionsArticle...
Augmented reality (AR) has the capacity to afford a virtual experience that obviates reliance on using two-dimensional representations of 3D molecules for teaching stereochemistry undergraduate students. Using combination quantitative instruments and qualitative surveys/interviews, this study explored relationships between students' attitudes, perceived cognitive load, spatial ability, academic performance when engaging in an asynchronous online activity. Our activity was designed elements...
There is little doubt that motivation influences the extent to which individuals engage with online learning experiences. With increasing role of digital technologies within chemistry higher education, this study illustrates how an augmented reality (AR)-supported educational escape activity (EEA), based on topics inorganic stereochemistry, can be employed environment. The design aspects our were guided by principles Self-Determination Theory (SDT)─an intrinsic-extrinsic theory motivation....
The reaction between NaNH2 and B(C6F5)3 affords the amidodiborate anion [H2N{B(C6F5)3}2]-, structure of which shows multiple intramolecular NH···F hydrogen bonding. Reaction with HCl [H(OEt2)2][H2N{B(C6F5)3}2], while treatment zirconocene dimethyls [CPh3][H2N{B(C6F5)3}2] gives highly active alkene polymerization catalysts.
The new mixed-alkyl metallocene complexes (SBI)M(Me)CH2SiMe3 (M = Zr, Hf) are accessible by the successive treatment of (SBI)MCl2 with Me3SiCH2MgCl and MeMgCl in toluene (SBI rac-Me2Si(1-Ind)2). Reaction B(C6F5)3 or CPh3+[B(C6F5)4]- toluene/difluorobenzene affords (SBI)Mδ+(CH2SiMe3)(μ-Me)Bδ-(C6F5)3 ion pairs [(SBI)MCH2SiMe3+···B(C6F5)4-], respectively. Both types compounds thermally stable aromatic solvents at ambient temperature. Whereas MeB(C6F5)3- alkyl ligand points away from metal tight...
The formation of cationic species relevant to olefin polymerization based on (SBI)HfCl2, Me2C(C5H4)(Flu)HfCl2, Ph2C(C5H4)(Flu)HfCl2, and L′HfCl2 activated by MAO, AlMe3/CPh3[B(C6F5)4], AlBui3/CPh3[B(C6F5)4] (SBI = rac-Me2Si(Ind)2; L′ C2H4(Flu)(5,6-C3H6-2-MeInd)) was studied 1H, 13C, 19F NMR spectroscopy. Thermally stable heterobinuclear intermediates the type [LHf(μ-Me)2AlMe2]+[MeMAO]− [LHf(μ-Me)2AlMe2]+[B(C6F5)4]− were identified when using MAO AlMe3/CPh3[B(C6F5)4] as activators,...
Abstract The lithiation of 1,3‐dipropoxy‐ p‐tert ‐butylcalix[4]arene (LH 2 ) followed by reaction with n BuMgBr in THF resulted the formation hetero‐bimetallic complex [Li(THF)Mg( Bu)L] ( 1 ). By contrast, treatment tripropoxy‐ (L′H) Bu Mg afforded a mononuclear [L′Mg( Bu)] Single‐crystal XRD studies revealed that both structures calix[4]arene adopts cone conformation, and Li cation resides cavity for . Both were active ring‐opening polymerisation rac‐ lactide. Compound displayed not only...
An educational escape activity was developed, embedding elements of both augmented and immersive virtual reality technologies, in an active learning environment. The mental visualization abstract concepts can be difficult for students, inhibiting their ability to reason cogently regarding important topics stereochemistry. Consequently, room coupled with technologies utilized foster teamwork critical thinking while encouraging student interaction three-dimensional molecular phenomena. Nine...
Bis(pentafluorophenyl)boron fluoride (C6F5)2BF·OEt2 (1), readily accessible from BF3·OEt2 and 2 equiv of C6F5MgBr, reacts with fluorenyllithium to give (Flu)B(C6F5)2 (4), while the reaction indenyllithium leads regioisomers 1- 2-IndB(C6F5)2 5 6, which are separated by fractional crystallization. 4 form crystalline adducts tert-butylamine. The trimethylsilyl derivatives Flu(SiMe3)B(C6F5)2 (9) Ind(SiMe3)B(C6F5)2 (10) similarly prepared. Heating ether cleavage formation (C6F5)2BOEt. Treatment 6...
The reaction between B(C6F5)3 and NH3(g) in light petroleum yielded the solvated adduct H3N·B(C6F5)3·NH3. Treatment with a second equivalent of afforded H3N·B(C6F5)3. Attempts to prepare analogous alane were unsuccessful resulted protolysis. Related compounds form R'R' 'N(H)·M(C6F5)3 synthesized from M(C6F5)3 corresponding primary secondary amines (M = B, Al; R' H, Me, CH2Ph; ' CH2Ph, CH(Me)(Ph); cyclo-C5H10). solid-state structures 13 new have been elucidated by single-crystal X-ray...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Reactivity of New Mono(cyclopentadienyl)zirconium -hafnium Alkyl Complexes. Crystal Molecular Structure [{C5H3(SiMe3)2}HfMe2(.eta.6-toluene)][BMe(C6F5)3]Simon J. Lancaster, Oliver B. Robinson, Manfred Bochmann, Simon Coles, Michael HursthouseCite this: Organometallics 1995, 14, 5, 2456–2462Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1...
Abstract A new family of cyclometallated gold(III) thiolato complexes based on pyrazine‐centred pincer ligands has been prepared, (C^N pz ^C)AuSR, where C^N ^C=2,6‐bis(4‐Bu t C 6 H 4 )pyrazine dianion and R=Ph ( 1 ), Bu‐4 2 2‐pyridyl 3 1‐naphthyl (1‐Np, 2‐Np 5 quinolinyl (Quin, 4‐methylcoumarinyl (Coum, 7 ) 1‐adamantyl 8 ). The were isolated as yellow to red solids in high yields using mild synthetic conditions. single‐crystal X‐ray structures revealed that the colour deep‐red is associated...
The new borate [CPh3]+[CN{B(C6F5)3}2]– and the anionic isocyanoborate complex [Ni{CNB(C6F5)3}4]2– are readily accessible in one-pot reactions act as a highly efficient activators for metallocene polymerisation catalysts; turnover numbers of up to 53 000 s–1 appear be highest reported so far ethene catalysts.
Der reaktive kationische 14‐Elektronen‐Komplex 2 läßt sich durch Bildung methylverbrückter Zweikernkomplexe der Typen 1 und 3 stabilisieren. Die Verbindungen sind hochaktive Katalysatoren für die Polymerisation von Ethylen Propylen. Wie das gezeigte Dissoziationsgleichgewicht zu erwarten, erweisen neutrale Alkylmetallverbindungen im Überschuß als Inhibitoren; so nimmt Aktivität mit steigender AlMe ‐Konzentration deutlich ab. magnified image
Reactive intermediates in living olefin polymerization over homogeneous catalysts based on bis[N-(3-tert-butylsalicylidene)-2,3,4,5,6-pentafluoroanilinato]titanium(IV) dichloride (L2TiCl2) have been studied. Outer sphere ion pairs [L2TiMe(S)]+[Me-MAO]- and [L2TiMe(S)]+[B(C6F5)4]- (S = solvent molecule), formed by activation of L2TiCl2 with MAO or AlMe3/[CPh3]+[B(C6F5)4]-, reactions these ethene to afford chain-propagating species [L2TiP]+[Me-MAO]- [L2TiP]+[B(C6F5)4]- (P growing polymeryl...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTConstruction of a Borole Ligand from Coordinated Diene and B(C6F5)3 via Successive C−H Activation Steps: A Case Catalyst Self-ActivationGerardo Jiménez Pindado, Simon J. Lancaster, Mark Thornton-Pett, Manfred BochmannView Author Information School Chemistry, University Leeds LS2 9JT, UK Cite this: Am. Chem. Soc. 1998, 120, 27, 6816–6817Publication Date (Web):June 23, 1998Publication History Received31 March 1998Published online23 June inissue...
Borate-substituted di- and tri-anionic cyclopentadienyi ligands [X3B–C5H4]2– [X2B(C5H4)2]3–-(X = C6F5) give anionic group 4 metallocene complexes which provide a facile route to zwitterionic 'single-component' alkene polymerisation catalysts.
The silyl ethers 3-But-2-(OSiMe3)C6H3CH=NR (2a-e) have been prepared by deprotonation of the known iminophenols (1a-e) and treatment with SiClMe3 (a, R = C6H5; b, 2,6-Pri2C6H3; c, 2,4,6-Me3C6H2; d, 2-C6H5C6H4; e, C6F5). 2a-c react TiCl4 in hydrocarbon solvents to give binuclear complexes [Ti{3-But-2-(O)C6H3CH=N(R)}Cl(mu-Cl3)TiCl3] (3a-c). pentafluorophenyl species 2e reacts complex Ti{3-But-2-(O)C6H3CH=N(R)}2Cl2. mononuclear five-coordinate complex, Ti{3-But-2-(O)C6H3CH=N(2,4,6-Me3C6H2)}Cl3...