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Zero-valent Group 6 complexes of 1,2,4,5-tetrakis(diphenylphosphino) benzene

Hogarth, G; Norman, T; (1996) Zero-valent Group 6 complexes of 1,2,4,5-tetrakis(diphenylphosphino) benzene. INORG CHIM ACTA , 248 (2) 167 - 174.

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Abstract

The tetradentate ligand, 1,2,4,5-tetrakis(diphenylphosphino)benzene (TPPB) (1),has been utilised to prepare linked Group 6 carbonyl complexes [{M(CO)(4)}(2)(mu-TPPB)] (M=Cr, Mo, W) (2a-c), fac,fac-[{Mo(CO)(3)(MeCN)}(2)(mu-TPPB)] (3), fac,fac-[{Mo(CO)(3)(pph(3))}(2)(mu-TPPB)] (4), fac,fac-[{Mo(CO)(3)(eta(1)-DPPE)}(2)(mu-TPPB)] (5) and both cis and trans isomers of [{M(CO)(2)(eta(2)-DPPE)}(2)(mu-TPPB)] (M = Mo, W) (6b-c). Attempts to prepare oligomers or polymers were unsuccessful, further reaction of 2b with TPPB afforded [(eta(2)-TPPB){Mo(CO)(2)}(mu-TPPB){Mo(CO)(4)}] (7). The molecular structures of 1, 2b and 2c . 2THF have been determined by X-ray crystallography. Crystal data: for 1, monoclinic, space group P2(1)/a, a = 11.1954(21), b = 15.8671(27), c = 12.3605(25) Angstrom, beta = 99.981(15)degrees, V = 2162.46 Angstrom(3), Z = 2; for 2b, monoclinic, space group P2(1)/a, a = 18.9560(33), b = 13.1023(33), c = 23.0303(50) Angstrom, beta = 99.516(15)degrees, V = 5641.25 Angstrom(3), Z = 4; for 2c . 2THF, orthorhombic, space group Pnmn, a = 13.2676(37), b = 15.1089(45), c = 18.8811(35) Angstrom, V = 3786.64 Angstrom(3), Z = 2.

Type:Article
Title:Zero-valent Group 6 complexes of 1,2,4,5-tetrakis(diphenylphosphino) benzene
Keywords:crystal structures, Group 6 metal complexes, zero-valent complexes, tetradentate phosphine complexes, CRYSTAL-STRUCTURE, COORDINATION POLYMERS, CHEMISTRY, MOLYBDENUM
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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