摘要
本文合成了系列配合物Ln(n-C_5H_(11)COO)_3·2H_2O(Ln=Y,Sm,Eu,Gd,Tb,Er和Yb),并对[Y(n-C_5H_(11)COO)_3·2H_2O]_2的晶体结构进行了研究。结果表明该晶体属于单斜晶系,P2_1/α空间群。晶胞参数如下:a=8.925(6),b=14.033(5),c=19.988(6)(?);β=95.90(3)°;V=2490.3(?)~3,Z=2.2978个独立可观察点(Ⅰ>3σ(Ⅰ))参加了结构修正,最终R因子为0.085。分子中1两个Y原子通过两个μ_2-C_5H_(11)COO桥基连结成双核配合物;每个Y还与两个双齿螯合的羧基和两个水分子成键。因此Y原子的配位数为9。对系列化合物的红外光谱也进行了研究。
A scries of complexes Ln(n-C5H11COO)3·2H2O, where Ln = Y, Sm, Eu, Gd, Tb, Er and Yb, have been synthesized. Their similarities in composition and structure have been confirmed by the elemental analysis and FT-IR spectra. As a representative of these complexes, the crystal and molecular structure of titled complex has been determined by single crystal X-ray diffraction techniques with a four circle diffractometer. 2978 independent reflections [I>3σ(I)] were used for the structure refinement to give a final R value of 0.085. The crystal is in monoclinic with a space group P21 / a. The unit cell parameters are: a = 8.925(6), b= 14.033(5), c= 19.988(6) A; β = 95.90(3)°; V=2490.3A3; Z = 2.
In the molecule, two Y atoms are connected by two u2-bridging carboxylic groups to form a dimer. The non-bonding distance between Y-Y is 4.086(2)A. The middle point of Y-Y linking line is the symmetrical center of the molecule. Each Y atom is coordinated by nine oxygen atoms, of which, two from two water molecules; four from two chelate carboxylic groups and the rest three are provided by a u2-bridging carboxylic group. The average bond length for Y-O(H2O) and Y-O (chelate carboxylic groups) are 2.350 and 2.431 A respectively; and the bond lengths related with u2-bridging carboxylic group is 2.460, 2.366 and 2.504 A.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
1992年第1期22-27,共6页
Chinese Journal of Inorganic Chemistry
基金
中国自然科学基金
关键词
正已酸
钇配合物
合成
晶体结构
n-pentanoic acid Y synthesis crystal structure
