MgII, CaII, and CoII Metal-Organic Framework Materials with [Si(p-C6H4CO2)3(p-C6H4CO2H)]3– Struts

Abstract

Three new metal-organic framework materials [Mg3(LH)2(EtOH)2(H2O)]·(EtOH)4.5(H2O)0.25 (IMP-13Mg), [Co3(LH)2(EtOH)2(H2O)]·(EtOH)3 (IMP-13Co), and [Ca3(LH)2(EtOH)4]·(EtOH)6 (IMP-14) have been prepared from the treatment of silanetetrabenzoic acid (L-H4) with MgII, CoII, and CaII salts respectively. In all cases the silanetetrabenzoic acid has been triply deprotonated and the resultant carboxylate groups assemble with trinuclear metal-based nodes to give (3,6)-connected kgd-type two-dimensional layers. These layers are then extended into the third dimension by coordination of the metal nodes by carboxylic acid groups in adjacent layers. In the case of IMP-13Mg/Co, only alternate L-H connectors and metal nodes are involved in these interlayer interactions, leaving some acid groups free within the structure. However, in IMP-14 all L-H connectors and metal nodes participate in interlayer bonding.