Two protons masquerading as a metal ion? Anionic coordination polymers of uranyl ion and tetrahydrofurantetracarboxylate with protonated or metal-complexed azamacrocyclic cations

Two complexes, [R,S-Me6cyclamH2][(UO2)3(thftc)2] (1) and [(UO2)3(thftc)2Cu(R,S-Me6cyclam)]⋅2H2O (2), have been obtained from reaction of uranyl nitrate with (2R*,3R*,4S*,5S*)-tetrahydrofurantetracarboxylic acid (H4thftc) under solvo-hydrothermal conditions in the presence either R,S-Me6cyclam⋅4HNO3 or [Cu(R,S-Me6cyclam)(NO3)2] (R,S-Me6cyclam = 7(R),14(S)-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane). Isomerization situ results both complexes involving chiral 2R*,3R*,4R*,5S* form ligand. (UO2)3(thftc)22– diperiodic networks V2O5 topology are formed cases, which separated by layers hydrogen bonded counterions 1, united into a triperiodic framework 3,5T1 bridging copper(II) cations 2. The packing anionic sheets azamacrocyclic moieties is however nearly identical two species, as consequence similar stereochemistry otherwise different interactions linking polymer units.