作者:Marcello Gennari、Irene Bassanetti、Luciano Marchiò
DOI:10.1016/j.poly.2009.05.073
日期:2010.1
Three new N2S2 donor ligands 1,1'-((2-(2-(phenylthio)phenylthio)phenyl)methylene)bis(3,5-R-1H-pyrazole), R = H (L-H), R = Me (L-Me), R = i-Pr (Li-Pr) have been prepared and characterized, These bifunctional ligands incorporate two distinct chelate donor systems, by virtue of the presence of bispyrazole and bis-thioether functions. The preferred conformation of these ligands is such that the N-2 and S-2 donor moieties may be oriented in opposite directions, thus favoring the formation of molecular chains when treated with AgBF4. The X-ray structures of Ag(I) complexes show that, depending on the steric hindrance present on the pyrazole rings, these ligands behave as kappa(4)-SSNN-mu bridging tetradentate (when R = H), or kappa(3)-SNN-mu bridging tridentate (when R = Me, i-Pr). Interestingly, [Ag(L-H)]BF4 crystallizes in the chiral space group P4(1), with the molecular chain that is folded around the 4(1) screw axis. (C) 2009 Elsevier Ltd. All rights reserved.