Construction of magnet-type coordination polymers using high-spin {Ni4}-citrate cubane as secondary building units.
Three potassium(i)-nickel(ii)-citrate coordination polymers, [K4Ni6(cit)4(H2O)8]n (), [K14Ni17(cit)12(H2O)33]n·10nH2O () and [K8Ni12(cit)8(H2O)15]n·2nH2O (), have been self-assembled in a solvothermal synthesis. Interestingly, these three polymers share the common {Ni4(cit)4}(8-) cubane ({Ni4}-cit-cub) secondary building units. The diverse ways of linking the {Ni4}-cit-cubs and additional isolated octahedral Ni(ii) ions lead to disparate magnetic exchange-coupling interactions, namely ferromagnetic for and and antiferromagnetic for . More importantly, the weak ferromagnetic interactions do not lead to long-range magnetic ordering above 2 K in or , whereas the strong antiferromagnetic interaction in leads to uncompensated magnetic moment due to the non-collinear alignment of the spins. Further magnetic characterization confirms the coexistence of spin-canted antiferromagnetism and spin glass behaviour in .
Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behaviour of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710054, P. R. China. zheng.yanzhen@xjtu.edu.cn.
Teng
T
Li
Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behaviour of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710054, P. R. China. zheng.yanzhen@xjtu.edu.cn.
Yanyan
Y
Wang
Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behaviour of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710054, P. R. China. zheng.yanzhen@xjtu.edu.cn.
Lei
L
Qin
Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behaviour of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710054, P. R. China. zheng.yanzhen@xjtu.edu.cn.
Tian
T
Han
Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behaviour of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710054, P. R. China. zheng.yanzhen@xjtu.edu.cn.
You-Song
YS
Ding
Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behaviour of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710054, P. R. China. zheng.yanzhen@xjtu.edu.cn.
Yue-Qiao
YQ
Hu
Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behaviour of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710054, P. R. China. zheng.yanzhen@xjtu.edu.cn.
Yan-Zhen
YZ
Zheng