Synthesis and structure determination of seven-coordinate K[In-III(Hdtpa)]center dot 3.5N(2)O

In this paper, the title complex K[In-III (Hdtpa)] . 3. 5H(2)O(dtpa=diethyl enetriaminepentaacetic acid) was synthesized and its crystal structure was determined by single-crystal X-ray structure analysis. The crystal belongs to monoclinic system, P2(1)/c (No. 14) space group with a = 0. 978 1 (2) nm , b = 0. 733 8(1) nm, c = 2. 962 9(6) nm, beta = 91. 81(3)degrees, V = 0. 2 12 6(1) nm(3), Z = 4, M = 606. 31, D-x = 1. 895 g . cm(-3), mu = 1. 382 1 m m(-1), F(000) = 1 228, R = 0. 035 and R-w = 0. 041 for 2 802 unique reflect ions. The complex anion [In-III (Hdtpa)](-) has a pseudo-monocapped trigona l prismatic seven-coordination structure in which the seven coordinate atom s, three N and four O atoms, are all from a ligand dtpa, In addition, it ca n be seen that the complex anion [In-III(Hdtpa)](-) can furnish a free carb oxyl. group(-CH2COOH) being used for molecular embellishment to form the ta rget diagnosis- and treat-drug of anticancer.