Coordination polymers of zinc and cadmium thiocarboxylates with 4,4′-bipyridine ligands
摘要:
The reaction of M(SC{O}R)(2) with 4,4'-bipyridine (bpy) in the ratio 1:1 gives [{M(SC{O}R)(2)(mu-bpy)}(n)] [R = Me, M = Zn (1) and Cd (2); R = Ph, M = Zn (3) and Cd (4)]. The compound [{Cd-2(SC{O}Ph)(4)(p-bpy)}(n)] (5) was obtained from Cd(SC{O}Ph)(2) and bpy in the ratio 2:1. The structures of 1, 3, 4 and 5 have been determined by X-ray crystallography. All these compounds have one-dimensional zigzag polymeric structures. In 5, the repeating unit has two Cd(II) bridged by S atoms of the two Ph{O}CS- ligands and each carbonyl oxygen atom of the bridging ligands is bonded to a Cd(II) atom so that the two PhC{O}S- anions have S-2, O bonding mode. Each Cd(II) is further attached to a chelating thiobenzoato ligand and bridged by a bpy ligand. The bridging nature of the thiobenzoate anion observed in 5 is hitherto unknown for Group 12 metal compounds. All the compounds decompose to the corresponding metal sulfides in nitrogen atmosphere, according to weight loss observed in TG. Compounds 1-3 provided cubic phases of the metal sulfides while 4 and 5 gave hexagonal CdS from pyrolysis as confirmed by XRD. (C) 2002 Elsevier Science B.V. All rights reserved.
The Chemistry of Cadmium–Thiocarboxylate Derivatives: Synthesis, Structural Features, and Application As Single Source Precursors for Ternary Sulfides
摘要:
Novel heterobimetallic complexes [(PPh3)(2)Cu(mu-SCOPh)(2)Cd(SCOPh)] (2a), [(PPh3)(2)Cu(mu-SCOth)(2)Cd(SCOth)] (2b), [(PPh3)(2)Ag(mu-SCOth)(2)Cd(SCOth)] (3a), [(PPh3)(2)Ag(mu-SCOth)(2)Cd(H2O)(SCOth)] (3b), [(PPh3)(2)Ag(mu-SCOPh)(2)Cd(SCOPh)] (3c), and a bimetallic complex [PPh3Cd(mu-SCOth)SCOth](2) center dot CH2Cl2 (5) (th = thiophene) were prepared and characterized by single crystal X-ray diffraction analysis. A coordination polymer [Cd(SCOPh)(2)](n) (4) has also been characterized structurally that exhibited metal-like electrical conductivity. The heterobimetallic complexes on pyrolyzing under controlled conditions yielded ternary sulfides of composition CuCd7S8, CuCd10S11, Ag2Cd8S9, and Ag2Cd5S6, which have been characterized by SEM-EDX and X-ray diffractometry. Photophysical properties and electrical conductivities of the sulfides have also been studied.
Novel heterobimetallic complexes [(PPh3)(2)Cu(mu-SCOPh)(2)Cd(SCOPh)] (2a), [(PPh3)(2)Cu(mu-SCOth)(2)Cd(SCOth)] (2b), [(PPh3)(2)Ag(mu-SCOth)(2)Cd(SCOth)] (3a), [(PPh3)(2)Ag(mu-SCOth)(2)Cd(H2O)(SCOth)] (3b), [(PPh3)(2)Ag(mu-SCOPh)(2)Cd(SCOPh)] (3c), and a bimetallic complex [PPh3Cd(mu-SCOth)SCOth](2) center dot CH2Cl2 (5) (th = thiophene) were prepared and characterized by single crystal X-ray diffraction analysis. A coordination polymer [Cd(SCOPh)(2)](n) (4) has also been characterized structurally that exhibited metal-like electrical conductivity. The heterobimetallic complexes on pyrolyzing under controlled conditions yielded ternary sulfides of composition CuCd7S8, CuCd10S11, Ag2Cd8S9, and Ag2Cd5S6, which have been characterized by SEM-EDX and X-ray diffractometry. Photophysical properties and electrical conductivities of the sulfides have also been studied.
Coordination polymers of zinc and cadmium thiocarboxylates with 4,4′-bipyridine ligands
作者:Jagadese J. Vittal、Jeyagowry T. Sampanthar、Zheng Lu
DOI:10.1016/s0020-1693(02)01188-x
日期:2003.1
The reaction of M(SCO}R)(2) with 4,4'-bipyridine (bpy) in the ratio 1:1 gives [M(SCO}R)(2)(mu-bpy)}(n)] [R = Me, M = Zn (1) and Cd (2); R = Ph, M = Zn (3) and Cd (4)]. The compound [Cd-2(SCO}Ph)(4)(p-bpy)}(n)] (5) was obtained from Cd(SCO}Ph)(2) and bpy in the ratio 2:1. The structures of 1, 3, 4 and 5 have been determined by X-ray crystallography. All these compounds have one-dimensional zigzag polymeric structures. In 5, the repeating unit has two Cd(II) bridged by S atoms of the two PhO}CS- ligands and each carbonyl oxygen atom of the bridging ligands is bonded to a Cd(II) atom so that the two PhCO}S- anions have S-2, O bonding mode. Each Cd(II) is further attached to a chelating thiobenzoato ligand and bridged by a bpy ligand. The bridging nature of the thiobenzoate anion observed in 5 is hitherto unknown for Group 12 metal compounds. All the compounds decompose to the corresponding metal sulfides in nitrogen atmosphere, according to weight loss observed in TG. Compounds 1-3 provided cubic phases of the metal sulfides while 4 and 5 gave hexagonal CdS from pyrolysis as confirmed by XRD. (C) 2002 Elsevier Science B.V. All rights reserved.