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• W2025484574 endingPage "1949" @default.
• W2025484574 startingPage "1943" @default.
• W2025484574 abstract "The 18-membered mixed-donor macrocycle 6,7,8,9,10,11,12,13,20,21-decahydro-5H, 19H-dibenzo[b,m][1,15,5,8,11]dioxatriazacyclooctadecin-20-ol (L), which contains N3O3 donor set, was synthesized. Also two nickel(II) complexes of L have been synthesized and characterized by X-ray crystallography, FT-IR, UV-Vis absorption spectroscopy and elemental analysis. The structure of complexes shows an unexpected anion dependence. Reaction of Ni(ClO4)2·6H2O with L afforded [NiL](ClO4)2·CH2Cl2 complex in which L uses all donor atoms and acts as a hexadentate ligand so forming a mononuclear nickel(II) complex in distorted octahedral geometry. Contrasting with this, when NiCl2·6H20 is used, the product complex [{NiLCl}2(μ-Cl)2] is dimeric and consists of two NiLCl units bridged by two chloride ions. The coordination geometry of each nickel atom is a distorted octahedral. In this complex L is exo-coordinated via only three nitrogen atoms to a nickel ion, which is bound to two cis bridging chloride and one non-bridging chloride too. Also complexing properties of L towards Ni(ClO4)2·6H2O and NiCl2·6H20 have been determined by UV-Vis titration in methanol. The computer treatment of the data confirmed the 1:1 metal to ligand stoichiometry for two complexes in solution and gave reliable values for corresponding stability constants (logK = 3.00 ± 0.02 with Ni(ClO4)2·6H2O and logK = 3.29 ± 0.06 with NiCl2·6H20)." @default.
• W2025484574 created "2016-06-24" @default.
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• W2025484574 date "2008-09-01" @default.
• W2025484574 modified "2023-10-18" @default.
• W2025484574 title "Synthesis, Characterization, X-ray Structures, and Solution Studies of Nickel(II) Complexes of an Aza-Crown Macrocycle with a Hydroxyl Pendant-Armed" @default.
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• W2025484574 doi "https://doi.org/10.1002/zaac.200800211" @default.
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