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• W2111002800 abstract "The reactions of diselenophosphates, [dsep, (RO)2PSe2−; R = Et, nPr and iPr] with cadmium(II) and mercury(II) perchlorates in a 2 : 1 molar ratio formed compounds of stoichiometry M[Se2P(OR)2]2 {M = Cd, R = Et (1), nPr (2), iPr (3); Hg, Et(4), nPr (5), iPr (6)}, and with zinc(II) perchlorates, chalcogen centered tetranuclear clusters, [Zn4(μ4-E){Se2P(OR)2}6] {E = Se, R = Et (7), nPr (8), iPr (9); E = O, R = Et (10), nPr (11), iPr (12)} were formed. All these complexes have been characterized with the help of analytical data, X-ray crystallography (1, 3, 6, 10, 11 and 12), and FAB-mass spectrometry (7–12). Compound 1 is a linear double-chain polymer, in which each pair of Cd atoms is bridged by two dsep ligands; the mercury polymer 6 has a helical chain structure, in which two Hg atoms are bridged by one dsep ligand, and the other ligand chelates the Hg atom. The chelating dsep ligands lie on either side of the helical chain. Compound 3 exists as a dimer in which two cadmium atoms are connected by two bridging dsep ligands, and each cadmium atom is further chelated by a dsep ligand. The metal atoms in 1, 3 and 6 are each coordinated by four selenium atoms in a distorted tetrahedral geometry. Clusters 10–12 have tetrahedral array of zinc atoms with an oxygen atom in the center with edge-bridging dsep ligands. Positive FAB-mass spectra support the formation of selenium-centered clusters, 7–9, of which the cluster 8 was structurally confirmed earlier. The solution state behavior of compounds 1–12 has been studied by using multinuclear NMR spectroscopy. Dimer 3 in CD2Cl2 showed monomer–dimer exchange equilibrium in the temperature range 20 to −90 °C and the free energy of activation is calculated from the coalescence temperature as ΔG‡(223 K) = 38.5 kJ mol−1. Polymer 6 undergoes depolymerization in CDCl3 and exhibits monomer–dimer exchange equilibrium in the temperature range 20 to −60 °C." @default.
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• W2111002800 date "2006-01-01" @default.
• W2111002800 modified "2023-09-24" @default.
• W2111002800 title "Coordination chemistry of Group 12 metals with phosphorodiselenoates: syntheses, structures and VT 31P NMR study of monomer–dimer exchange equilibrium" @default.
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• W2111002800 doi "https://doi.org/10.1039/b510728h" @default.
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