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Two novel acid-base adducts,[H_2L_1~(2+)](Hpbda)_2(1,L_1 = l,4-di(lH-imidazol-4-yl)benzene,H_2pbda = 1,4-benzenedicarboxylic acid) and[H_2L_2~(2+)](NO_3)_2(2,L_2 = l,4-di(l-carboxymethyl-imidazol-4-yl)benzene),have been prepared and characterized by singl