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Two complexes, [ R,S -Me 6 cyclamH 2 ][(UO 2 ) 3 (thftc) 2 ] ( 1 ) and [(UO 2 ) 3 (thftc) 2 Cu( R,S -Me 6 cyclam)]⋅2H 2 O ( 2 ), have been obtained from reaction of uranyl nitrate with (2 R* ,3 R* ,4 S* ,5 S* )-tetrahydrofurantetracarboxylic acid (H 4 thftc) under solvo-hydrothermal conditions in the presence of either  R,S -Me 6 cyclam⋅4HNO 3  or [Cu( R,S -Me 6 cyclam)(NO 3 ) 2 ] ( R,S -Me 6 cyclam = 7( R ),14( S )-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane). Isomerization  in situ  results in both complexes involving the chiral 2 R* ,3 R* ,4 R* ,5 S*  form of the ligand. (UO 2 ) 3 (thftc) 22–  diperiodic networks with the V 2 O 5  topology are formed in both cases, which are separated by layers of hydrogen bonded counterions in  1 , or united into a triperiodic framework of 3,5T1 topology by bridging copper(II) cations in  2 . The packing of anionic sheets and azamacrocyclic moieties is however nearly identical in the two species, as a consequence of the similar stereochemistry of the otherwise different interactions linking the diperiodic polymer units.

journal of coordination chemistry

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