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• W2154264198 endingPage "214" @default.
• W2154264198 startingPage "207" @default.
• W2154264198 abstract "Six dinuclear cobalt(II) complexes of pyrazolate ligands with multidentate chelating side arms {3,5-(R2NCH2)2C3N2H2; R2N = [Me2N(CH2)3]2N (HL1) or (Et2NCH2CH2)2N (HL2)} have been prepared and characterised. The reaction of L1 and L2 with 2 equivalents of [Co(MeCN)6][BF4]2 and NaBPh4 proceeds via the isolable compounds [Co2L1(BF4)][BPh4]2 1a and [Co2L2(BF4)][BPh4]2 2a finally to afford the dinuclear complexes [Co2L1F][BPh4]2 1b and [Co2L2(F)(H2O)][BPh4]2 2b, respectively, where a fluoride has been abstracted from the BF4– starting material in both cases. While the longer side arms in 1b allow for an exogenous bridging position of the fluoride, an additional water molecule is incorporated in 2b to form an FHO(H) moiety with an unusually short F–H–O bridge between the two cobalt centres. Evidence is reported for the reversible extrusion of the water molecule from 2b. Treatment of 2b with KBr or NaN3 yielded the respective bromide- and azide-bridged complexes 3 and 4, where in the latter case the azide adopts a µ-1,3-bridging mode. The magnetic properties of 3 and 4 have been studied in the temperature range 8–200 K. Complexes 1b, 2b, 3 and 4 were also characterised by means of X-ray crystallography." @default.
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• W2154264198 date "1998-01-01" @default.
• W2154264198 modified "2023-10-03" @default.
• W2154264198 title "Tuning the metal–metal separation in pyrazolate-based dinuclear complexes by the length of chelating side arms ‡" @default.
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• W2154264198 doi "https://doi.org/10.1039/a705545e" @default.
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