A novel self-assembled Na{Cu12 Zn4 } multifunctional material: first report of a discrete coordination compound for detection of Ca2+ ions and selective adsorption of cationic dyes in water

Dalton Transactions : an International Journal of Inorganic Chemistry
Khushboo ImanMusheer Ahmad

Abstract

A novel metal directed discrete self-assembled compound, Na2O[Cu12Zn4(μ-OH)8(H4btp)8](ClO4)8·26H2O (1), was synthesized employing a flexible aminoalcohol ligand, 2,2'-(propane-1,3-diyldiimino)bis-[2-(hydroxylmethyl)propane-1,3-diol] (H6btp), and mixed metal ions (CuII and ZnII) in order to explore it as a multifunctional material. The molecular cluster is characterized by spectral and analytical techniques, single crystal X-ray diffraction and magnetic studies. Crystallography reveals the presence of eight peripheral CuII centers in octahedral environments, while four interior CuII and ZnII centers are present in tetrahedral systems. The ligand is coordinated in the dianionic form (H4btp2-) with copper and zinc metal ions through various bridging modes. Magnetic data suggest the presence of strong antiferromagnetic coupling between the twelve Cu(ii) centers (C = 4.31 cm3 K mol-1 and θ = -120.44 K). Interestingly, the eight ligands present in the system have eight free hydroxyl groups at the periphery of the cluster, which could be employed in molecular recognition for the analytes under investigation. One of the sodium cations of the lattice sodium oxide [Na2O or Na+(Na+O2-)] is encapsulated in the {Cu12Zn4} cavity and held thr...Continue Reading

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