Construction of magnet-type coordination polymers using high-spin {Ni4}-citrate cubane as secondary building units

Teng Li; Yanyan Wang; Lei Qin; Tian Han; You-Song Ding; Yue-Qiao Hu; Yan-Zhen Zheng

doi:10.1039/c6dt01405d

Construction of magnet-type coordination polymers using high-spin {Ni4}-citrate cubane as secondary building units

Dalton Trans. 2016 Jun 28;45(26):10798-806. doi: 10.1039/c6dt01405d.

Authors

Teng Li¹, Yanyan Wang¹, Lei Qin¹, Tian Han¹, You-Song Ding¹, Yue-Qiao Hu¹, Yan-Zhen Zheng¹

Affiliation

¹ 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.

PMID: 27294693
DOI: 10.1039/c6dt01405d

Abstract

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 .