摘要:
Trinuclear Cu(II)-pyrazolates of the general formula (Bu4N)(2)[Cu-3(mu(3)-Cl)(2)(mu-4-R-pz)(3)Cl-3] (pz = pyrazolato anion, R = Cl, Br, I, Me), 1-4, have been prepared and characterized by X-ray diffraction and/or H-1 NMR, IR, UV-Vis spectroscopy and elemental analysis. Their structure and spectroscopic properties match the ones of the parent unsubstituted complex (Bu4N)(2)[Cu-3(mu(3)-Cl)(2)(mu-pz)(3)Cl-3], indicating that 4-substitution of the pyrazole ligands with halogen or methyl groups does not induce structural variation. In contrast, dinuclear complexes (Bu4N)(4)[Cu-2(mu-3-Me-pz)(2)Cl-4]Cl-2 (.) 4H(2)O, Cu-2(mu-CI)(mu-3,5-Me-2-pz)(3,5-Me-2-pzH)(4)Cl-2, Cu-2(mu-Cl)(mu-OH)(3-Me-5-Ph-pzH)(4)Cl-2 (.) 3-Me-5-Ph-pzH and Cu-2(mu-Cl)(2)(3,5-Ph-2-pzH)(4)Cl-2, 5-8, have been prepared with 3- and 3,5-substituted pyrazoles by the same or similar synthetic protocols. (C) 2004 Elsevier B.V. All rights reserved.