摘要:

IntroductionThe use of metal–organic building blocks in lieu of solely inorganic units, for example, metal oxide tetrahedra, in the construction of extended solids is a highly topical field.1With the variations possible in metal (oxidation state, geometry, hardness/softness), as well as ligand (geometry, basicity, denticity), the range of possible frameworks is truly vast. The ligand 1,3,5-benzenetricarboxylic acid (BTC), also known as trimesic acid, has been extensively studied as a building block for extended coordination solids.2–4BTC has several advantageous qualities which have led to its widespread use. It is highly symmetrical (D3h) with a divergent orientation of functional groups to favor the formation of an extended solid. The carboxyl group is a very good ligand and its coordination preferences are well known for a broad range of metals.The ligand is anionic allowing for the exclusion of potentially void-occupying counter-ions. BTC can also complement its metal coordinative abilities with hydrogen bonding.3Finally, the ligand is commercially available at a low cost.Our research group,5and others,6have been studying the coordination chemistry of various sulfonated ligands as building blocks for extended frameworks. Particularly with transition metals, the general trend is that sulfonate groups will not displace water from the primary coordination sphere.7Undoubtedly, this has been the cause of some reluctance to employ the sulfonate group more in the construction of extended solids. The present work reports the first coordination polymer of 5-sulfoisophthalic acid,L,8essentially, a ligand where a carboxyl group of BTC has been exchanged for a sulfonate group. The framework that results, {[Cu1.5(L)(py)5](py)(H2O)6.76}∞,1, is a pseudo-honeycomb Cu2+net incorporating solvent-filled channels and demonstrating sulfonate coordination to the transition metal center.

ISSN:1466-8033    

DOI:10.1039/b200503d

出版商:RSC    

年代:2002

数据来源: RSC