Studies on Rare Earth Complexes of Polyaza Polycarboxylic Macrocycle (Ⅰ)--Syntheses and Crystal Structure of Na[Er(DOTA)H2O]·3H2O Complex

Abstract

Abstract: The complexes, Na[Ln(DOTA)H₂O]·3H₂Owere synthesized in aqueous solution (Ln = Er, Yb; H₄DOTA =1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid).The crystal structure of Na [Er (DOTA) H₂O]·3H₂O was determined by four-circle X-ray diffractometer. The crystal is orthorhombic with space group P2₁2₁2₁The cell parameters are as follows; a=l. 5795(8) nm, 6=1. 5777(8) nm, c=0. 9142(5) nm, V = 2. 278(3) nm³, Z=4.In the crystal the Er(Ⅲ) ion is coordinated by four nitrogen atoms and four oxygen atoms from DOTAand one oxygen atom from water, so that the coordination number of Er(Ⅲ) is nine, taking a monocapped antisquare prism arrangement.

Key words: Rare earth, Polyaza polycarboxylic macrocycle, Crystal structure

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Jin Tian-zhu, Wang Xiao-qing, Xu Guang-xian, Ma Zhe-sheng, Ling Hong. Studies on Rare Earth Complexes of Polyaza Polycarboxylic Macrocycle (Ⅰ)--Syntheses and Crystal Structure of Na[Er(DOTA)H₂O]·3H₂O Complex[J]. Chem. J. Chinese Universities, 1991, 12(8): 999.

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Studies on Rare Earth Complexes of Polyaza Polycarboxylic Macrocycle (Ⅰ)--Syntheses and Crystal Structure of Na[Er(DOTA)H₂O]·3H₂O Complex

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