Crystal structure and magnetism of a well isolated 2D-quantum Heisenberg antiferromagnet, (Quinolinium)(2)CuBr(4).2H(2)O, and its anhydrous form.
Crystal structure and magnetism of a well isolated 2D-quantum Heisenberg antiferromagnet, (Quinolinium)(2)CuBr(4).2H(2)O, and its anhydrous form.
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良好隔离的二维量子海森堡反铁磁体 (Quinolinium)(2)CuBr(4).2H(2)O 及其无水形式的晶体结构和磁性。
作者：
R. Butcher;M. Turnbull;C. Landee;A. Shapiro;F. Xiao;David J. Garrett;W. Robinson;B. Twamley
喹啉与HBr和cur(2)反应生成两种化合物的混合物（喹啉）(2)cur(4)。已解出单晶x射线结构的2H(2)O(1)和（喹啉）(2)cur(4)(2)。化合物1在单斜空间群C2/c中结晶为四溴铜酸盐离子层，由喹啉离子层隔开。化合物2在三斜空间群P1中结晶。磁性数据分析表明，1表现为二维量子海森堡反铁磁体，层内2J/k(B) = -6.17(3) k。低温下的高磁场数据表明，T(N)必须小于1.8 K / 1，从而得到| K (B)T(N)/2J| < 0.29，表明层间隔离良好。化合物2的磁性交换较弱，符合2J/k(B) = -1.59(3) k的线性链式反铁磁体。
Reaction of quinoline with HBr and CuBr(2) generates a mixture of two compounds, (quinolinium)(2)CuBr(4).2H(2)O (1) and (quinolinium)(2)CuBr(4) (2) for which single-crystal X-ray structures have been solved. Compound 1 crystallizes in the monoclinic space group C2/c as layers of tetrabromocuprate ions which are separated by intervening layers of quinolinium ions. Compound 2 crystallizes in the triclinic space group P1. Magnetic data analysis reveals that 1 behaves as a 2D-quantum Heisenberg antiferromagnet with 2J/k(B) = -6.17(3) K within the layers. High field magnetization data at low temperatures suggests that T(N) must be less than 1.8 K for 1, yielding a figure of merit |k(B)T(N)/2J| < 0.29, which indicates excellent isolation between the layers. Magnetic exchange in compound 2 was much weaker and was fit to a linear chain antiferromagnet with 2J/k(B) = -1.59(3) K.