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• W2021981013 abstract "Abstract 2-Isopropylimidazole (L) reacts with nickel(II) salts to yield complexes of the formulae NiL4X2(X = Cl−, Br−, I−, SCN−, SeCN−, NO3−, ClO4−, PF6− or NiL4XClO4 (X = Cl−, Br−, I−, SCN−). The structure of these complexes is rationalised on the basis of spectral, magnetic and conductivity measurements as well as their analytical data. All the compounds possess tetragonally distorted octahedral structure (D4h). The extent of tetragonality varies with the nature of the axial ligands. Complexes with X = SCN−, SeCN−, NO3− are tetragonally distorted to only a small extent giving a triplet 3A2 ground state resulting in the formation of paramagnetic complexes with two unpaired electrons. Strong tetragonal distortion leading to a singlet 1E ground state and consequent diamagnetism is observed when X = Cl−, Br−, I−, ClO4−. The complexes NiL4(PF6)2 and NiL4(SCN)(ClO4) have intermediate magnetic moments in the range 2.2–2.3 B.M. and thus have a singlet ground state with a thermally accessible spin-triplet level. Thermal decomposition of NiL4X2 (X = Cl−, Br−, NO3staggered−) give strongly tetragonal, diamagnetic NiLCl2 and weakly tetragonal, paramagnetic NiL2Br2 and NiL2(NO3)2 complexes. The coordination number in all the cases is found to be six." @default.
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• W2021981013 date "1976-01-01" @default.
• W2021981013 modified "2023-09-26" @default.
• W2021981013 title "Tetragonal nickel(II) complexes with singlet and triplet ground states: Complexes with 2-isopropyl imidazole" @default.
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• W2021981013 doi "https://doi.org/10.1016/0022-1902(76)80117-0" @default.
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