2,5-Thiophenedicarboxylate: An Interpenetration-Inducing Ligand in Uranyl Chemistry

Seven uranyl ion complexes have been crystallized under solvo-hydrothermal conditions from 2,5-thiophenedicarboxylic acid (tdcH2) and diverse additional, structure-directing species. [UO2(tdc)(DMF)] (1) is a two-stranded monoperiodic coordination polymer, while [PPh3Me][UO2(tdc)(HCOO)] (2) simple chain with terminal formate coligands. Although it also monoperiodic, [C(NH2)3][H2NMe2]2[(UO2)3(tdc)4(HCOO)] (3) displays an alternation of tetra- hexanuclear rings. Two-stranded subunits are bridged by oxo-coordinated NiII cations to form diperiodic network in [UO2(tdc)2Ni(cyclam)] (4), but homometallic sql assembly built [Cu(R,S-Me6cyclam)(H2O)][UO2(tdc)2]·H2O (5), which the counterion hydrogen bonded only. Diperiodic networks hcb topology formed both [Zn(phen)3][(UO2)2(tdc)3]·2H2O·3CH3CN (6) [PPh4]2[(UO2)2(tdc)3]·2H2O (7). The slightly undulating layers 6 crossed oblique columns weakly interacting counterions polythreading-like fashion. In contrast, larger curvature 7 allows for three-fold, parallel 2D interpenetration occur. These results compared previously reported cases polycatenation uranyl–tdc2– system.