摘要:
IntroductionIn the late sixties Musgrave and Mattson synthesized the first complexes of transition metals with 4,4′bipyridine, and suggested that these compounds were coordination polymers, based on their infrared spectral data.1Recent interest in the use of bipyridyl-based bridging ligands and transition metal halides in the preparation of various layered structures stems from the recognition that these polymeric frameworks possess potentially useful properties such as catalysis,2conductivity,3,4magnetism,5and optical behaviors.6Mercury complexes have been the focus of many recent studies. In these complexes Hg2+exhibits a range of coordination configurations such as trigonalplanar,7octahedral,8squareplanar,9and the preferred tetrahedral environments10depending on the ligand geometry and reaction conditions. However, for polymeric 4,4′bipyridyl dihalide adducts [MX2(4,4′bipy)]n, it remains a challenge to obtain their single crystals suitable for Xray analysis.11–14There are few such complexes, and those reported are mostly intractable microcrystalline materials insoluble in common organic solvents. Structural information has been obtained from powder samples, and such samples may be strongly perturbed by a multiphase condition.The adducts of transition metal dihalides MBr2and MCl2with a layered structure have shown semiconductor properties.15Mercury iodide adducts Hg(L)I2are relatively unexplored because of their potential toxicity and the limited solubility of these metallates in common solvents, and structural information on such compounds is rather scarce. Only a few Xray analyses of structures have been reported for the piperazine–bipyridyl adduct by this laboratory.16Through a facile method the assembly and crystal growth of HgI2with 4,4′bipyridylbased ligands has been achieved. The synthesis and characterization of a new selfassembled adduct [HgI2(4,4′-azpy)]nand its nonlinear optical properties in DMF solution are reported here.
ISSN:1466-8033
DOI:10.1039/b105883p
出版商:RSC
年代:2001
数据来源: RSC