Metal carboxylate-phosphonates containing flexible N-donor co-ligands?

Dalton Transactions Pub Date: 2010-04-08 DOI: 10.1039/B927100G

Abstract

This paper reports mixed ligated metal phosphonates with formula [Zn2(4-cppH)2(L1)] (1), [Zn3(4-cpp)2(L2)2]·2.5H2O (2), [Zn3(4-cpp)2(L3)]·H2O (3) and [Ni2(4-cppH)2(L1)3]·2H2O (4), where L1 = 1,4-bis(imidazol-1-ylmethyl)benzene, L2 = 1,3-bis(imidazol-1-ylmethyl)-benzene, L3 = 1,2-bis(imidazol-1-ylmethyl)benzene and 4-cppH3 = 4-carboxyphenylphosphonic acid. Compound 1 shows a layer structure in which the inorganic double chains made up of {ZnO3N} and {PO3C} tetrahedra are connected by L1 bridges in a trans-mode. In compound 2, an inorganic hexanuclear cluster is observed where the six zinc atoms are bridged purely through O–P–O units from four 4-cpp3?. The L2 ligand adopts both cis- and trans-coordination modes to link the hexanuclear clusters into a three-dimensional framework structure with primitive cubic pcu topology. Compound 3 displays another type of layer structure in which the inorganic chains made up of {ZnO3N} (or {ZnO4}) and {PO3C} tetrahedra are linked by both the 4-cpp3? and L3 ligands. The L3 ligand adopts cis-coordination mode. Unlike Zn(II) ions in 1–3, the Ni(II) ions in compound 4 are octahedrally coordinated, and are bridged by both 4-cppH2? and L1 ligands, resulting in an interesting double layer structure with the lattice water filling in the intralayer space. The thermal stabilities, luminescent and magnetic properties are investigated.

Graphical abstract: Metal carboxylate-phosphonates containing flexible N-donor co-ligands
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