A unique mu-dichloro-bridged butterfly-shaped dimer: synthesis and crystal structure of [Cu(bpmh)Cl-2](2) (bpmh=2,2 '-bipyridyl-3-carbomethoxy-3 '-formylhydrazine), roles of pi-pi interaction and steric hindrance effect in crystal packing

作者：Wu BL; Mao HY; Yao MX; Shen XQ; Zhang HY^*; Chen PK; Hou HW; Zhu Y

来源：Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry, 2005, 35(5): 423-428.

DOI：10.1081/SIM-200059235

• crystal structure
• dichloro-bridged dimeric copper
• pi-pi interaction
• steric hindrance effect

The title complex, [Cu(bpmh) Cl-2](2), was formed from Cu( II) with 2,2'-bipyridyl-3-carbomethoxy-3'-formyhydrazine (bpmh), by-product of the reaction of 2,2'-bipyridyl- 3,3'-dicarbomethoxy (bpdc) with hydrazine hydrate, during the preparation of the copper( II) complex of bpdh (bpdh = 2,2'- bipyridyl- 3,3'-diformylhydrazine) in acetone. The structure of [ Cu( bpmh) Cl-2](2) has been determined by X-ray diffraction analysis as a mu-dichloro- bridged, butterfly-shaped dimer. The dimer unit, [Cu( bpmh) Cl-2](2), crystallizes in the monoclinic space group C2/c. The geometry of the copper centers is tetragonal-pyramidal with two chlorine atoms and two pyridine nitrogen atoms in the base and one bridged chlorine atom at the apex. The values of the bridging angle, out-of-plane Cu( 1B)- Cl(2A) distance, and Cu( 1)- Cu(1A) separation are 87.7 degrees, 2.881 angstrom and 3.584 angstrom, respectively. The crystal packing pattern of [Cu( bpmh) Cl-2](2) is influenced by pi-pi interaction and steric hindrance.

• 出版日期2005
• 单位郑州大学