The novel one-dimensional chain of europium(III) complex [Eu2(BTA)6(4,4′-bpdo)]n containing dimers bridged by terminal oxygen atoms of 4,4′-bpdo molecules

A new europium ternary complex [Eu-2(BTA)(6)(4,4-bpdo)](n) (HBTA=benzoyltrifluoroacetone, 4,4'-bpdo=4,4-bipyridine dioxide) is prepared. Crystal analysis shows that it possesses infinite one-dimensional linear chains containing binuclear coordination moieties Eu-2(BTA)(6)(4,4'-bpdo) in which two Eu(III) ions were bridged by two terminal oxygen atoms from two different 4,4'-bpdo molecules. There are two crystallographically distinct Eu-2(BTA)(6)(4,4'-bpdo) units, in which all Eu(III) ions are in the similar EuO8 environments but with different symmetries and twisting angles between pyridine rings. The inter-chain pi-pi stacking interactions between neighboring phenyl rings in Eu2 chains extend the 1D coordination chains to construct a novel 2D supramolecular architecture, which further stabilizes this structure. (c) 2004 Elsevier B.V. All rights reserved.