Bruce Spivack

Bio: Bruce Spivack is an academic researcher from Technion – Israel Institute of Technology. The author has contributed to research in topics: Octahedron & Molybdenum. The author has an hindex of 6, co-authored 11 publications receiving 225 citations.

Crystal and molecular structure of dicaesium µ-(ethylenediaminetetraacetato)-di-µ-sulphido-bis[oxomolybdate(V)] dihydrate

Abstract: The crystal and molecular structure of the title compound was determined by Patterson and Fourier methods from X-ray diffraction data collected by counter methods. Crystals are orthorhombic, space group Pnam, with Z= 4 in a unit cell of dimensions: a= 12·385(3), b= 7·108(3), c= 24·537(3)A. Full-matrix least-squares refinement of 2196 reflections gave R 0·059. The hexadentate ethylenediaminetetra-acetate (edta) ligand co-ordinates to each molybdenum atom through two carboxylato-oxygens and a nitrogen while two bridging sulphur atoms and a terminal oxygen complete the co-ordination sphere around each molybdenum. The short Mo–Mo bond [2·799(1)A] suggests that the co-ordination geometry around each metal atom may be described as a distorted capped octahedron sharing a common edge determined by the two sulphur atoms. The molecule possesses a mirror plane, passing through the two sulphur atoms, which necessitates disorder in the ethylenic carbon atoms of the bridging edta ligand.

Separation and unusual stability of the sulphur-bridged ion Mo2S2O22+

Abstract: The sulphur-bridged ion, Mo2S2O22+, which has been separated from the parent compound, Na2Mo2O2S2-(cysteine)2, is stable towards acids and does not dissociate to a paramagnetic monomeric species, as does its oxo-bridged analogue, Mo2O42+, even in very concentrated acidic solutions.

1,2-Dithiolene Complexes of Transition Metals

Abstract: Publisher Summary Over the past two decades there has been a phenomenal increase in the study of the chemistry of transition metal complexes containing sulfur ligands. There are a number of reasons for this, the major one being the revitalization of the chemistry of the unsaturated sulphur donor chelates. These were used as early as the 1930s as analytical reagents for various metals. The interest in complexes of these ligand systems now embraces areas ranging from purely academic syntheses to large-scale industrial production. Almost every available physical technique has been utilized for the elucidation of the molecular and electronic structures and the kinetics manifested in these systems. The spiraling interest in the complexes of sulfur donor ligands has prompted number of excellent and frequently exhaustive reviews. Other reasons for the expansion of the field of dithiochelate chemistry have undoubtedly included the correlations of model complexes with biological systems.

Sulfur Atoms as Ligands in Metal Complexes

Abstract: The types of sulfur bonding—as sulfane or sulfide—encountered in the molecules of maingroup elements are almost unknown in the chemistry of metal complexes, where the sulfur atoms function instead as two-electron donors by bridging two metal atoms, as four-electron donors by bridging three or four metal atoms, or as six-electron donors by incorporation between four metal atoms. In such complexes, the metal-metal bond can be modified over a wide range by chemical or electrochemical variation of the number of electrons present. The readiness with which polynuclear complexes containing metals and sulfur undergo redox reactions is also utilized by Nature in the active sites of some redox proteins.