Layered copper compounds based on 4-(3-bromothienyl)phosphonate (BTP): weak ferromagnetism observed in [Cu2(4,4′-bpy)0.5(BTP)2]·H2O

作者：Lirong Guo, Feng Zhu, Yu Chen, Yi‐Zhi Li, Li‐Min Zheng · 发表于：Dalton Transactions · 年份：2009 · DOI：10.1039/b907356f · 被引用次数：30 · 研究领域：Chemical Synthesis and Characterization、Metal-Organic Frameworks: Synthesis and Applications、Polyoxometalates: Synthesis and Applications

Two copper phosphonates based on 4-(3-bromothienyl)phosphonic acid (BTPH2) with formula Cu(H2O)(BTP) (1) and [Cu2(4,4'-bpy)0.5(BTP)2].H2O (2) are reported. Compound 1 has a layered structure in which dimers of {Cu2O2}, made up of edge-sharing {CuO6} octahedra, are bridged by both the {PO3C} tetrahedra through corner-sharing and the water molecules. Compound 2 exhibits a novel layered structure where the {Cu2(BTP)2} columns, containing {Cu4O6} tetrameric cores and O-P-O linkages, are connected by 4,4'-bipyridine. In both cases, the 3-bromothienyl groups are grafted on the two sides of the layers. Magnetic studies reveal that antiferromagnetic interactions are mediated between the Cu(II) centers in 1, while for 2, weak ferromagnetism resulted from spin canting is observed. Electrochemical properties of compounds 1-2 are also investigated.