Synthesis and crystal structure of dinuclear cyclopalladated 1,2- and 1,3-bridged squarato complexes
摘要:
Two new dinuclear Pd(II) cyclometalated complexes of formula [L2Pd2(mu-1,2-sq)(C5H11N)(2)] (1) and [L2Pd2(mu-1,3-sq)(C5H11N)(2)]. 2[(C5H12N)BF4] (1a) [HL = 2,6-dimethylazobenzene], have been synthetized from a reaction of the mononuclear [LPd(acetone)(2)][BF4] with the piperidinium salt of squaric acid, [C5H12N](2)[sq]. The single crystal X-ray analysis of complexes 1 and 1a shows that the sq ligand is found to bridge in both mu-1,2- and mu-1,3-coordination modes. These are the first examples of squarato Pd(II) complexes characterized structurally up to now. (C) 2000 Elsevier Science S.A. All rights reserved.