CRYSTAL STRUCTURE OF NEODYMIUM（Ⅲ）COMPLEX WITH 1,2,4-BENZENETRICARBOXYLIC ACID

摘要

＜正＞ [NdC6H3（COO）3（H2O）3]·H2O, Mr=423. 45, orthorhombic,space groupP212121,a=6. 120（3） ,b=9. 719（2） ,c=20. 133（8） A ,V=1197. 5A3.Z = 4,F （000） = 820,DC=2. 35g/cm3,μ（Moka） = 44. 1cm-1.The final R = 0. 0278 and Rw= 0. 0270 for 1760（I＞3σ（I）） observed unique reflections. The neodymium ion is nine-coordinated by six oxygen atoms of carboxylato groups from four 1, 2, 4-benzenetricar-boxylates and three aqua molecules,forming a distorted monocapped square antiprism. The Nd -O distances fall in the range of 2. 41 - 2. 70A with an average of 2. 51A