Two Novel Three-Dimensional Lead(II) Coordination Polymers Involving 16-Membered Rings: [Pb2(Bs-glu)2(bipy)2] and [Pb2(Bs-glu)2(phen)2]

The reaction of Pb(CH3COO)2·3H2O with N-benzesulfonyl-L-glutamic acid in the presence of 2, 2′-bipyridine (bipy) or 1,10-phenanthroline (phen) produced two novel complexes [Pb2(Bs-glu)2(bipy)2] (1) and [Pb2(Bs-glu)2(phen)2] (2) (Bs-glu = N-benzesulfonyl-L-glutamic acid dianion). In 1 chains bearing alternative 16-membered rings and Pb2O3 nodes are constructed from the interactions of PbII ions with the carboxylates of Bs-glu ligands. To the best of our knowledge, this is the first lead(II) complex of carboxylates with the formation of chains of Pb2O3. In 2 the 16-membered ring units are connected by centrosymmetric Pb2O2 nodes to form chains. Complexes 1 and 2 construct the 3-D supramolecular architectures through versatile hydrogen bonds and π-π stacking interactions.

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