Quadruple bridged-carbonate supported dodecanuclear [Ni8Ca4] coordination cluster
NEW JOURNAL OF CHEMISTRY（2024）
摘要
A dodecanuclear [Ni8Ca4] compound, [Ni-8(L)(8)Ca-4(CO3)(4)(dmf)(5.5)(H2O)(6.5)]20H(2)O (1 ) (dmf = dimethylformamide) has been prepared by the reaction of a polydentate ligand (E)-2-(2-hydroxy-3-methoxybenzylidene)amino-4-nitrophenol (H2L ) with NiCl26H(2)O, CaCl22H(2)O and Na2CO3 in dmf at room temperature. The solid-state molecular structure of compound 1 was determined by single crystal X-ray crystallography. Compound 1 consists of a [Ni8Ca4] coordination wheel with eight Ni-II ions and four Ca-II ions assembled by four carbonates and eight deprotonated L2- ligands. The asymmetric unit of compound 1 contains two Ni-II ions, one Ca-II ion, two coordinated deprotonated Schiff base ligands (L2- ), one coordinated carbonate ion, two coordinated dmf molecules (one with occupancy of 0.36), two coordinated water molecules (one with occupancy 0.64). Compound 1 is the largest coordination cluster containing Ni-II and Ca-II ions reported to date. The magnetic properties of 1 show the presence of predominant antiferromagnetic interactions. The magnetic susceptibility and isothermal magnetization data can be well reproduced with: g = 2.145(1), J(1) = 2.93(4) cm(-1), J(2) = -0.41(2) cm(-1) and J(3) = -5.66(4) cm(-1).
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