Syntheses and structures of heterobimetallic complexes derived from [Ga(edt)2]− as a metalloligand (edt=−SC2H4S−): Potential precursors for ternary materials MGaS2 (M=Cu or Ag)
摘要:
Metathesis reaction between equimolar amount of [Et4N][GaCl4] and Na(2)edt in methanol resulted in the formation of the dichloro complex [Et4N][Ga(edt)Cl-2] (1), whereas reaction of [Et4N][GaCl4] with two equivalents of Na(2)edt in methanol gave the complex [Et4N][Ga(edt)(2)] (2) which can act as a metalloligand. Treatment of 2 with M(PPh3)(2)NO3 in DMF/CH2Cl2 afforded the heterobimetallic complexes [Ga(edt)(2)M-(PPh3)(2)] (M= Cu 3, Ag 4) in moderate yields. The structures of 1-4 were determined by single-crystal X-ray diffraction analyses. Both [Ga(edt)Cl-2] and [Ga(edt)(2)] anions have a distorted tetrahedral geometry. The former consists of one five-membered ring formed by chelating dithiolate and two terminal chloride atoms while the latter consists of two five-membered rings formed by two the chelating dithiolates. Complexes 3 and 4 consist of metalloligand [Ga(edt)(2)] anion chelated to [M(PPh3)(2)](+) via the sulfur atoms. Both tetrahedrally coordinated Ga and Cu(Ag) atoms are bridged by two sulfur atoms, forming a planar "GaS2M" (M = Cu, Ag) core. Thermogravimetry analysis revealed that heterobimetallic complexes 3 and 4 decomposed to give the corresponding ternary metal sulfide materials. (C) 2010 Elsevier B.V. All rights reserved.
Syntheses and structures of heterobimetallic complexes derived from [Ga(edt)2]− as a metalloligand (edt=−SC2H4S−): Potential precursors for ternary materials MGaS2 (M=Cu or Ag)
摘要:
Metathesis reaction between equimolar amount of [Et4N][GaCl4] and Na(2)edt in methanol resulted in the formation of the dichloro complex [Et4N][Ga(edt)Cl-2] (1), whereas reaction of [Et4N][GaCl4] with two equivalents of Na(2)edt in methanol gave the complex [Et4N][Ga(edt)(2)] (2) which can act as a metalloligand. Treatment of 2 with M(PPh3)(2)NO3 in DMF/CH2Cl2 afforded the heterobimetallic complexes [Ga(edt)(2)M-(PPh3)(2)] (M= Cu 3, Ag 4) in moderate yields. The structures of 1-4 were determined by single-crystal X-ray diffraction analyses. Both [Ga(edt)Cl-2] and [Ga(edt)(2)] anions have a distorted tetrahedral geometry. The former consists of one five-membered ring formed by chelating dithiolate and two terminal chloride atoms while the latter consists of two five-membered rings formed by two the chelating dithiolates. Complexes 3 and 4 consist of metalloligand [Ga(edt)(2)] anion chelated to [M(PPh3)(2)](+) via the sulfur atoms. Both tetrahedrally coordinated Ga and Cu(Ag) atoms are bridged by two sulfur atoms, forming a planar "GaS2M" (M = Cu, Ag) core. Thermogravimetry analysis revealed that heterobimetallic complexes 3 and 4 decomposed to give the corresponding ternary metal sulfide materials. (C) 2010 Elsevier B.V. All rights reserved.