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Two single and double chain manganese coordination polymers {[Mn(L1 )(H2O)2]NO3}n (1) and [Mn(L2)2(H2O)]n (2)(HL1 = 2,2′:6 ′,2″-terpyridine-4′-carboxylic acid, HL2 = 4 -(4-′carboxypheny 1)-2,2′:6′2″-terpyridine) have been synthesized hydrothermally,and ch