Two unique antiferromagnetic 3D frameworks with unusual CuII4 cluster and alternate CuII4 + CuII1 structural motif tuned by aromatic polycarboxylate coligand†
Abstract
Two new 3-amino-1,2,4-triazole (amtrz)-based 3D MOFs, [Cu4(amtrz)2(μ3-OH)2(btc)2]n (1), and [Cu5(amtrz)2(H2O)2(μ3-OH)2(btec)2]n (2) (btc3− = 1,3,5-benzenetricarboxylate and btec4− = 1,2,4,5-benzenetetracarboxylate), were hydrothermally synthesized and structurally and magnetically characterized. Each cationic [Cu4(amtrz)2(μ3-OH)2]6+ cluster in 1 is periodically extended into an infinite 3,6-connected rtl-type topological network via six btc3−