高等学校化学学报2013，Vol.34Issue(3)：520-526,7.DOI:10.7503/cjcu20120733
铬酸根桥联Cu(Ⅱ)/Ni(Ⅱ)链状配位聚合物的合成及性质
Synthesis and Characterization of Chromate Cu (Ⅱ) / Ni(H)Chain Complexes
摘要
Abstract
Two new one-dimensional chain complexes, ( NH4 ) 2 [ Cu ( NH3) 2 ( CrO4 ) 2 ] (1) and ( NH4 ) 2·[ Ni(NH3)2(Cr04)2] (2) , were obtained by mixing copper nitrate or nickel nitrate with the same molar of ammonium dichromate in ammonia water at room temperature, and they were characterized by single-crystal X-ray diffraction (XRD) , thermogravimetric analysis ( TGA) and differential thermal analysis ( DTA ). Furthermore , the complexes were magnetically characterized by temperature-dependent magnetic susceptibility, field-dependent magnetization, and alternate current (AC) magnetic measurements. The structure analysis results show that crystals of both complexes are triclinic, space group P(1) with a = 0. 59090(12) nm, 6 = 0. 6929(3) nm, c = 0. 73740(15) nm, α = 107. 03 (4)°, β = 92. 79(3)°, γ=112.44(2)° for Cu(Ⅱ) complex and 0 = 0.56987(7) nm, b = 0. 69972(9) nm, c = 0. 73335(8) nm, α = 104. 929 (3 )°, β = 96.7121(3)°, γ=112. 325(4)° for Ni( Ⅱ ) complex. In the crystal structure, the [ M( NH3)2]2+ units are linked by two chromato bridges, forming an eight-member ring. As a whole, both complexes have one-dimensional chain structures. The two complexes began to break down as the temperature gradually reached 150℃ or so, leaving behind H2Cr2Cu05 and H2Cr2Ni05, and afterwards they are dehydrated at above 410℃. The temperature-dependent magnetic susceptibilities were measured in the range of 2-300 K, which implies a weak antiferro-magnetic interaction between the adjacent mental ions. The field-dependent magnetization and AC magnetic measurements indicate that the two complexes are both antiferromagnets.关键词
一维结构/配位聚合物/晶体结构/热分析/磁性表征Key words
One-dimensional (1D) structure/ Coordination polymer/ Crystal structure/ Thermal analysis/ Magnetic characterization分类
化学化工引用本文复制引用
蔡良圆,齐琪,杨春,江山,姜谦,王庆伦,任红霞..铬酸根桥联Cu(Ⅱ)/Ni(Ⅱ)链状配位聚合物的合成及性质[J].高等学校化学学报,2013,34(3):520-526,7.基金项目
国家自然科学基金(批准号:21071085,21101096,90922032)、天津市自然科学基金(批准号:11JCYBJC03500)和河北省自然科学基金(批准号:B2012202106)资助. （批准号:21071085,21101096,90922032）
