Co(ii) and Ni(ii) complexes based on anthraquinone-1,4,5,8-tetracarboxylic acid (H4AQTC): canted antiferromagnetism and slow magnetization relaxation in {[Co2(AQTC)(H2O)6]·6H2O}
作者:Wei-Hong Yan、Song-Song Bao、Jian Huang、Min Ren、Xiao-Li Sheng、Zhong-Sheng Cai、Chang-Sheng Lu、Qing-Jin Meng、Li-Min Zheng
DOI:10.1039/c3dt50381j
日期:——
Three coordination polymers [Co2(AQTC)(H2O)6]·6H2O}n (1), [M2(AQTC)(bpym)(H2O)6]·6H2O}n (M = Co(2), Ni(3)) have been synthesized and structurally characterized, where H4AQTC is anthraquinone-1,4,5,8-tetracarboxylic acid and bpym is 2,2′-bipyrimidine. Complex 1 features a 3-D structure, where layers of Co2(AQTC) are cross-linked by Co–H2O chains. Complexes 2 and 3 are isostructural and display 1-D chain structures. The chains are connected through hydrogen-bonding interactions to form 3-D supramolecular structures. Magnetic properties of these complexes are investigated. Compound 1 shows canted antiferromagnetism and slow relaxation below 4.0 K. For complexes 2 and 3, dominant antiferromagnetic interactions are observed. The luminescent properties of the three complexes are investigated as well.
三种配位聚合物[Co2(AQTC)(H2O)6]·6H2O}n (1), [M2(AQTC)(bpym)(H2O)6]·6H2O}n (M = Co(2), Ni( 3))已被合成并进行结构表征,其中H4AQTC是蒽醌-1,4,5,8-四甲酸,bpym是2,2'-联嘧啶。配合物 1 具有 3-D 结构,其中 Co2(AQTC) 层通过 Co-H2O 链交联。配合物 2 和 3 是同构的并显示一维链结构。这些链通过氢键相互作用连接形成 3-D 超分子结构。研究了这些配合物的磁性。化合物 1 显示倾斜的反铁磁性和低于 4.0 K 的缓慢弛豫。对于配合物 2 和 3,观察到主要的反铁磁性相互作用。还研究了三种配合物的发光特性。