Synthesis and structural characterization of several dirhenium(III) compounds

摘要

Reaction between Re-2(OAc)(4)Cl-2 and N,N'-dicyclohexylbenzamidine (HDCyBA) under molten conditions yielded Re-2(DCyBA)(2)Cl-4 (1); reaction of [Bu4N](2)[Re2Cl8] with N,N'-di(3-methoxyphenyl)formamidine (HDmAniF) resulted in Re-2(DmAniF)(2)Cl-4 (2); reaction of cis-Re-2(OAc)(2)Cl-4 with HDmAniF under reflux conditions resulted in cis-Re-2(OAc)(2)(DmAniF)(2)Cl-2 (3). Reaction between Re-2(OAc)(4)Cl-2 and alpha,alpha,alpha',alpha'-tetramethyl-1,3-benzenedipropionic acid (H(2)esp) under reflux conditions led to Re-2(esp)(2)Cl-2 (4). Crystallographic studies of compounds 1-4 revealed Re-Re bond lengths of 2.1679(6), 2.1804(5), 2.2468(7), and 2.2304(6) angstrom, respectively, which are consistent with the presence of Re-Re quadruple bond. Also reported are electrochemical properties of compounds 1-4. (c) 2006 Elsevier B.V. All rights reserved.