摘要
金属有机配合物在磁性、荧光、分子吸附和半导体等多功能材料方面有着潜在的应用价值.通过水热方法合成了一种新型零维铈(Ⅳ)配合物[Ce(dipic)3]·2(Hpa)·2H2O(2,6-H2dipic=2,6-吡啶二羧酸,pa=对氨基吡啶),并通过X-射线衍射、元素分析、红外光谱和热重对该化合物进行了表征.该化合物属于单斜晶系,P21/c空间群,a=1.094 37(10)nm,b=2.052 63(18)nm,c=1.587 76(14)nm,β=106.085 0(10)°,Z=4,V=3.427(1)nm3,Dc=1.670g/cm3,Mr=861.72,λ(Mo Kα)=0.071 073nm,μ=1.41mm-1,F(000)=1 728,R=0.039 6,wR=0.107 3,符合I>2σ(I)的独立衍射点4 997个.铈(Ⅳ)离子被3个完全去质子化的羧基围绕,整个分子实体显负电,平衡电荷由质子化的对氨基吡啶提供.在该配合物中,N—H…O和O—H…O氢键对增强配合物的稳定性起了重要作用.
Metal-organic complexes have potential applications as important functional materials in magnetic, fluorescence, molecular adsorption and semiconductors. A novel zero-dimensional cerium (IV) complex [Ce(dipic)3]· 2(Hpa)· 2H2O (2,6-H2dipic^2,6-pyridinedicarboxylic acid, pa = pyr- idin-4-yl amine) has been hydrothermally synthesized and structurally characterized by elemental anal- ysis, IR spectra, TG and single-crystal X-ray diffraction. The complex 1 belongs to the monoclinic system, space group P21/c with a=l. 094 37 (10) nm, b=2. 052 63 (18) nm, c=l. 587 76 (14) nm, j?= 106.085 0(10)°, Z=4, V=3.427 0(5) nm3, Dc=1.670 g/cm3, Mr=861.72, λ(Mo Ka) = 0. 071 073 nm,μ= 1.41 mm-1, F(000) =1 728, R=0. 039 6 and wR=O. 107 3 for 4 997 observed re- flections with 1〉2o(1). The cerium (IV) ion of the title complex is surrounded by three wholly un- protonated carboxyl groups in the usual tridentate mode. The resulting molecular entity is negatively charged, and charge balance is maintained by the protonated Hpa. In the complex, the N--H...O and O--H'"O hydrogen bonds are crucial to enhance the stability of the complex.
出处
《分子科学学报》
CAS
CSCD
北大核心
2013年第5期425-429,共5页
Journal of Molecular Science
基金
河南省高等院校自然科学研究项目(2009A150011)
关键词
晶体结构
铈(Ⅳ)配合物
2
6一吡啶二羧酸
热性质
crystal structure
cerium (IV) complex~ 2,6-pyridinedicarboxylic acid
thermal properties