835875-59-7Relevant academic research and scientific papers
Sulfur bridged copper complexes with dye ligands
Fuhr, Olaf,Fenske, Dieter
, p. 1607 - 1612 (2004)
By a three step synthesis the dye Et2N-C6H 4-NN-C6H4-SSiMe3 (1) (azo-SSiMe 3) can be prepared, which reacts with copper(I) chloride under the cleavage of Me3SiCl forming different sulphur bridged complexes. Depending on the presence of different phosphine ligands the compounds [Cu 2(S-azo)2(PEt3)3] (2), [Cu 2(S-azo)2(PnPr3)3] (3) and [Cu 3(S-azo)3(PPh3)4] (4) can be obtained. These as well as the silylated dye 1 could be isolated and characterised as single crystals (1: space group P1, a = 769,2(2) pm, b = 943,0(2) pm, c = 1419,4(3) pm, α = 89,09(3)°, β = 76,40(3)°, γ = 87,40(3)°, Z = 2; 2: space group P21/c, a = 1142,3(2) pm, b = 2233,7(5) pm, c = 2391,8(5) pm, β = 102,84(3)°, Z = 4; 3: space group P21/c, a = 1076,0(2) pm, b = 1858,4(4) pm, c = 3284,1(7) pm, β = 95,10(3)°, Z = 4; 4: space group P1, a = 1353,9(3) pm, b = 1615,8(3) pm, c = 29966,6(3) pm, α = 92,24(3)°, β = 97,48(3)°, γ = 98,83(3)°, Z = 2). The UV-VIS spectra of 1-4 are dominated by a strong absorption of the diethylamino azobenzene group. Compared to 1 compounds 2 and 3 show a strong bathochromic shift of the absorption maximum, 4 shows a weaker shift.
