New ternary lanthanide coordination polymers of 1,4-naphthalenedicarboxylate with 1,10-phenanthroline

Three isostructural 2-D square grid coordination polymers [Ln2(NDC)3(phen)2(H2O)2] (Ln = La (1), Eu (2), Ho (3), NDC = 1,4-naphthalenedicarboxylate, phen = 1,10-phenanthroline) were synthesized by hydrothermal reactions of lanthanide chloride with 1,4-naphthalenedicarboxylic acid and phen. The 2-D coordination polymers were assembled into 3-D networks via O–H ⋯ O hydrogen bond. The photophysical property, magnetic property and thermal stability of complex 2 were investigated.