A5061652895- Organometallic Complex Synthesis and Catalysis
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metalloenzymes and iron-sulfur proteins
- Metal complexes synthesis and properties
- Inorganic Chemistry and Materials
- Magnetism in coordination complexes
- Crystallography and molecular interactions
- Synthesis and characterization of novel inorganic/organometallic compounds
- Asymmetric Hydrogenation and Catalysis
- Organometallic Compounds Synthesis and Characterization
- Metal-Catalyzed Oxygenation Mechanisms
- Radioactive element chemistry and processing
- Electrocatalysts for Energy Conversion
- Lanthanide and Transition Metal Complexes
- Coordination Chemistry and Organometallics
- Porphyrin and Phthalocyanine Chemistry
- Synthetic Organic Chemistry Methods
- Catalytic Cross-Coupling Reactions
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Organoboron and organosilicon chemistry
- Molecular Junctions and Nanostructures
- Carbon dioxide utilization in catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Inorganic and Organometallic Chemistry
Nagoya University
2013-2024
University of East Anglia
2023
Ingenierie des Materiaux polymeres
2023
58.com (China)
2023
ZHAW Zurich University of Applied Sciences
2023
International Union of Pure and Applied Chemistry
2023
Triangle
2023
Ospedale San Pietro Fatebenefratelli
2023
Walter de Gruyter (Germany)
2023
UNSW Sydney
2023
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new model for dioxygen binding in hemocyanin. Synthesis, characterization, and molecular structure of the .mu.-.eta.2:.eta.2 peroxo dinuclear copper(II) complexes, [Cu(HB(3,5-R2pz)3)]2(O2) (R = isopropyl Ph)Nobumasa Kitajima, Kiyoshi Fujisawa, Chisato Fujimoto, Yoshihiko Morooka, Shinji Hashimoto, Teizo Kitagawa, Koshiro Toriumi, Kazuyuki Tatsumi, Akira NakamuraCite this: J. Am. Chem. Soc. 1992, 114, 4, 1277–1291Publication Date (Print):February...
The hydrothermal reaction of YbCl(3) small middle dot6H(2)O with 1,2,4,5-benzenetetracarboxylic dianhydride resulted in [[Yb((b)btec)(1/4)((d)btec)(3/6)(H(2)O)(2)](4).6H(2)O](n)() (1) (H(4)btec = acid), and the solvothermal Er(NO(3))(3) or TbCl(3).6H(2)O H(2)O/acetic acid gave rise to [[Er(2)((c)btec)(2/4)((e)btec)(2/4)((f)btec)(2/4)(H(2)O)(4)].4H(2)O](n)() (2) [[Tb(H(2)btec)(2/4)((f)btec)(3/6)(H(2)O)].2H(2)O](n)() (3), respectively. Complex 1 crystallizes monoclinic space group C2/m a...
Abstract A theoretical analysis of two aspects the mechanism reductive elimination is presented—how choice central metal and peripheral ligands affects activation energy for from a four-coordinate MR2(PR3)2 complex how ligand asymmetry controls cis-trans rearrangements pathways proceeding through three-coordinate intermediates. The following conclusions emerge: (1) In complex, better σ-donating capability leaving groups, more facile elimination; (2) Stronger donor trans to groups will...
Merging cooperative Si-H bond activation and electrophilic aromatic substitution paves the way for C-3-selective indole C-H functionalization under electronic not conventional steric control. The is heterolytically split by Ru-S of a coordinatively unsaturated cationic ruthenium(II) complex, forming sulfur-stabilized silicon electrophile. Wheland intermediate subsequent Friedel-Crafts-type process assumed to be deprotonated sulfur atom, no added base required. overall catalysis proceeds...
Half-sandwich iron complexes of N-heterocyclic carbenes, Cp*Fe(L(R))Cl (2a; L(Mes) = 1,3-dimesityl-imidazol-2-ylidene, 2b; L(iPr) 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene, Cp* eta(5)-C5Me5), have been synthesized by the reaction Cp*Fe{N(SiMe3)2} (1) with corresponding imidazolium salts. Treatment 2a either methyllithium or phenyllithium replaces chloride a methyl phenyl group, generating Cp*Fe(L(Mes))R (3a; R Me, 3b; Ph). These complexes, in turn, undergo cyclometalation at elevated...
The B-H bond of typical boranes is heterolytically split by the polar Ru-S a tethered ruthenium(II) thiolate complex, affording hydride and borenium ions with dative interaction sulfur atom. These stable adducts were spectroscopically characterized, in one case, activation step was crystallographically verified, snapshot σ-bond metathesis. derived from 9-borabicyclo[3.3.1]nonane dimer [(9-BBN)2], pinacolborane (pinBH), catecholborane (catBH) allowed for electrophilic aromatic substitution...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon monoxide activation by biscyclopentadienyl complexes of Group 4 metals and actinides: .eta.2-acyl complexesKazuyuki Tatsumi, Akira Nakamura, Peter Hofmann, Stauffert, Roald HoffmannCite this: J. Am. Chem. Soc. 1985, 107, 15, 4440–4451Publication Date (Print):July 1, 1985Publication History Published online1 May 2002Published inissue 1 July 1985https://doi.org/10.1021/ja00301a012RIGHTS & PERMISSIONSArticle Views329Altmetric-Citations155LEARN...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBent cis d0 MoO22+ vs. linear trans d0f0 UO22+: a significant role for nonvalence 6p orbitals in uranylKazuyuki Tatsumi and Roald HoffmannCite this: Inorg. Chem. 1980, 19, 9, 2656–2658Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue 1 September 1980https://pubs.acs.org/doi/10.1021/ic50211a035https://doi.org/10.1021/ic50211a035research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleUnique chemical behavior and bonding of early-transition-metal-diene complexesHajime Yasuda, Kazuyuki Tatsumi, Akira NakamuraCite this: Acc. Chem. Res. 1985, 18, 4, 120–126Publication Date (Print):April 1, 1985Publication History Published online1 May 2002Published inissue 1 April 1985https://pubs.acs.org/doi/10.1021/ar00112a004https://doi.org/10.1021/ar00112a004research-articleACS PublicationsRequest reuse permissionsArticle...
A coordinatively unsaturated iron-methyl complex having an N-heterocyclic carbene ligand, [Cp*Fe(L(Me))Me] (1; Cp*=eta(5)-C(5)Me(5), L(Me)=1,3,4,5-tetramethyl-imidazol-2-ylidene), is synthesized from the reaction of [Cp*Fe(TMEDA)Cl] (TMEDA=N,N,N',N'-tetramethylethylenediamine) with methyllithium and L(Me). Complex 1 found to activate C-H bonds furan, thiophene, benzene, giving rise aryl complexes, [Cp*Fe(L(Me))(aryl)] (aryl=2-furyl (2), 2-thienyl (3), phenyl (4)). The bond cleavage reactions...
[NiFe] hydrogenase, the enzyme of which catalyzes reversible oxidation molecular hydrogen to protons and electrons, contains a unique heterodinuclear thiolate-bridged Ni-Fe complex in iron center is coordinated by CO CN. We have synthesized dithiolate-bridged complexes bearing CN ligands model active hydrogenase. The containing [(CN)2(CO)2Fe(mu-S2)NiS2] framework are closest yet structural models
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalloporphyrins with unusual geometries. 1. Mono-, di-, triatom-bridged porphyrin dimersKazuyuki Tatsumi and Roald HoffmannCite this: J. Am. Chem. Soc. 1981, 103, 12, 3328–3341Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published inissue 1 June 1981https://pubs.acs.org/doi/10.1021/ja00402a018https://doi.org/10.1021/ja00402a018research-articleACS PublicationsRequest reuse permissionsArticle...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn associative mechanism for reductive elimination of d8 NiR2(PR3)2Kazuyuki Tatsumi, Akira Nakamura, Sanshiro Komiya, Akio Yamamoto, and Takakazu YamamotoCite this: J. Am. Chem. Soc. 1984, 106, 26, 8181–8188Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 December 1984https://pubs.acs.org/doi/10.1021/ja00338a029https://doi.org/10.1021/ja00338a029research-articleACS PublicationsRequest reuse...
A coordinatively unsaturated dinuclear iron(II) complex of bulky thiolates, [(TipS)Fe(micro-SDmp)]2 (1; Tip = 2,4,6-(i)Pr(3)C(6)H(2), Dmp 2,6-(mesityl)(2)C(6)H(3)), was synthesized from stepwise reactions Fe{N(SiMe(3))2}2 with 1 equiv HSDmp and then HSTip. Complex found to react elemental sulfur (S8) in toluene generate a new class [8Fe-7S] cluster, [(DmpS)Fe(4)S(3)]2(micro-SDmp)2(micro-STip)(micro(6)-S) (2). The cluster 2 also produced one-pot + HSTip S8 (8:6:10:7/8)...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriangular platinum and nickel clusters: the "tinker-toy" construction of chains with high nuclearityDennis J. Underwood, Roald Hoffmann, Kazuyuki Tatsumi, Akira Nakamura, Yasuhiro YamamotoCite this: Am. Chem. Soc. 1985, 107, 21, 5968–5980Publication Date (Print):October 1, 1985Publication History Published online1 May 2002Published inissue 1 October...
A new 2-D coordination network with 22.2-A square-grid networks was prepared from a dicopper(II) tetraacetate [Cu2(AcO)4] as linear linker motif and 5,10,15,20-tetra-4-pyridyl-21H,23H-porphine (H2TPyP) four-connected vertex, forming regular high-porous structure. The characterization by N2 adsorption indicated that this has uniform micropores gas cavities.
The zirconocene complex [{(C₆F₅)₂B-(CH₂)₃-Cp}(Cp-PtBu₂)ZrCl₂] (6; Cp=cyclo-C₅H₄) was prepared by hydroboration of [(allyl-Cp)(Cp-PtBu₂)ZrCl₂] (5) with HB(C₆F₅)₂ ("Piers' borane"). It represents a frustrated Lewis pair (FLP) in which both the acid and base were attached at metallocene framework. Its reaction 1-pentyne did not result 1,2-addition or deprotonation FLP, but rather 1,1-carboboration triple bond, thereby obtaining Z/E mixture (1.2:1) respective organometallic substituted alkenes...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnique bonding and geometry in .eta.-cyclopentadienyltantalum-diene complexes. Preparation, x-ray structural analyses, EHMO calculationsHajime Yasuda, Kazuyuki Tatsumi, Takuji Okamoto, Kazushi Mashima, Keonil Lee, Akira Nakamura, Yasushi Kai, Noriko Kanehisa, Nobutami KasaiCite this: J. Am. Chem. Soc. 1985, 107, 8, 2410–2422Publication Date (Print):April 1, 1985Publication History Published online1 May 2002Published inissue 1 April...
N-heterocyclic carbene (NHC) adducts of iron dichloride, (IMes)2FeCl2 (1a; IMes = 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene) and (IEtPh*)2FeCl2 (1b; IEtPh* 1,3-bis((R)-1′-phenylethyl)imidazol-2-ylidene), were prepared in good yields from the reactions Fe{N(SiMe3)2}2 with imidazolium salts. While atom 1a has a tetrahedral geometry, replacement chlorides by methyl groups via treatment MeLi led to formation square-planar complex trans-(IMes)2FeMe2 (2). The molecular structures complexes...
Three polymeric heterothiometallic clusters with 3D pillar-layer-alternating honeycomblike frameworks are synthesized by a one-pot self-assembly reaction. Z-scan experiments demonstrate that the nonlinear optical (NLO) behavior of these can be modulated modifying conjugated chain connecting backbone ligands (see figure). Time-dependent density functional theory calculations support and rationalize observed NLO modulation.
The heterolytic splitting of hydrosilanes by ruthenium(<sc>ii</sc>) thiolates is illuminated a combined spectroscopic, crystallographic, and computational analysis.
The ruthenium(II)-catalyzed tandem cycloaddition of 1,6-heptadiynes with bicyclic alkenes, such as bicyclo[3.2.1]heptenones and norbornene derivatives, furnishes the 1:2 adducts between diynes two molecules bicycloalkenes together common [2 + 2 2] cyclocotrimerization products. structure a representative adduct dimethyl dipropargylmalonate 2,4-dimethylbicyclo[3.2.1]oct-6-en-3-one was unequivocally determined by X-ray analysis concluded to involve an unusual 1,2-dicyclopropylcyclopentene...
A series of mononuclear thio complexes pentamethylcyclopentadienyl−molybdenum(VI) and −tungsten(VI) have been synthesized via C−S bond-cleaving reactions thiolates. Use Li2S2 for sulfurization Cp*MoCl4 resulted in the known dinuclear complex, anti-Cp*2Mo2(S)2(μ-S)2 (1), while analogous reaction Cp*WCl4 gave rise to anti-Cp*2W2(S)2(μ-S)2 (2) (PPh4)[Cp*W(S)3] (3), latter which was isolated after subsequent cation exchange with PPh4Br. In contrast, Li2edt (edt = SCH2CH2S) followed by treatment...
The [8Fe−7S] core of the P-clusters in nitrogenases is unique among known [Fe−S] clusters which are essential to electron-transfer processes nature. cluster has been thought unstable and exist only protein environments. We found that this unusual structure can be self-assembled from reaction Fe(II) bis-amide, tetramethylthiourea, 2,4,6-triisopropylbenzenethiol, elemental sulfur a specific mole ratio. complex isolated therefrom closely resembles reduced form (PN) P-clusters, while...