Synthesis, crystal structure and charge transfer spectra of dinuclear copper(I) complexes bearing 1,2-bis(arylimino)acenaphthene acceptor ligands
摘要:
A series of dinuclear halide bridged copper(I) complexes with a central [Cu(2)(mu-X)(2)] diamond core (X = Cl, Br and I) and substituted bis(imino)acenaphthene (BIAN) ligands acting as strong pi-acceptor subunits was prepared and characterized by elemental analysis, X-ray crystallography and various spectroscopic techniques. In the visible spectral range, the electronic spectra of these deeply colored air-stable compounds are dominated by low-lying charge transfer (CT) transitions. The corresponding broad absorption bands display a bathochromic shift and a decreasing amount of negative solvatochromism in the series X = Cl, Br and I. At the same time, the distance between the two metals becomes shorter and reaches the range of cuprophilic interactions. These systematic trends are interpreted as a decreasing amount of charge transfer character and a more pronounced delocalization between the two copper centers within in the same series. (C) 2011 Elsevier B.V. All rights reserved.
Cationic and Neutral (Ar‐BIAN)Copper(I) Complexes Containing Phosphane and Arsane Ancillary Ligands: Synthesis, Molecular Structure and Catalytic Behaviour in Cycloaddition Reactions of Azides and Alkynes
作者:Lidong Li、Patrícia S. Lopes、Cláudia A. Figueira、Clara S. B. Gomes、M. Teresa Duarte、Vitor Rosa、Christophe Fliedel、Teresa Avilés、Pedro T. Gomes
DOI:10.1002/ejic.201201211
日期:2013.3.12
Invited for the cover of this issue are the groups of Pedro T. Gomes (Universidade Tecnica de Lisboa) and Teresa Aviles (Universidade Nova de Lisboa). The cover image shows the structure of one of the catalysts against a background of a bridge symbolising the collaboration between the two groups.
Pedro T. Gomes (Universidade Tecnica de Lisboa) 和 Teresa Aviles (Universidade Nova de Lisboa) 受邀登上本期封面。封面图片展示了其中一个催化剂的结构,背景是一座象征两个团体之间合作的桥梁。