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• W2034778308 abstract "Novel di- and tetra-copper(I) complexes of pyridazine (pydz) have been prepared and determined crystallographically. The yellow crystals of the dicopper(I) complex, [Cu2(pydz)3(MeCN)2][PF6]21 are monoclinic, space group C2/c, with a= 21.720(6), b= 8.803(8), c= 15.778(6)Å, β= 114.33(2)°, Z= 4, R= 0.056 and R′= 0.072. Two copper atoms are triply bridged by three pydz ligands to give a binuclear structure, in which the Cu ⋯ Cu separation is 3.065(2)Å. Each Cu atom is co-ordinated by three N atoms of three pydz molecules and one N atom of a MeCN molecule, providing a distorted tetrahedral environment. The orange crystals of the tetracopper(I) complex, [Cu4(pydz)6][ClO4]4·2Me2CO 2 are monoclinic, space group P21/a, with a= 16.368(2), b= 13.860(2), c= 10.542(2)Å, β= 102.25(1)°Z= 2, R= 0.050 and R′= 0.058. Two Cu atoms are bridged by four N atoms of two pydz molecules to form a six-membered N2Cu2N2 framework. Furthermore, two parallel N2Cu2N2 frameworks are linked by two different pydz molecules to give a tetranuclear structure. Four Cu atoms are coplanar and each Cu atom is in a trigonal–square environment. The shortest Cu ⋯ Cu separations are 3.096(1) and 3.264(1)Å. If in the preparation of 2 ethylene or CO atmospheres are employed instead of Ar, copper(I) pydz adducts with C2H4 or CO are obtained which have been characterized by IR and 1H NMR spectroscopy. The former shows vCC of C2H4 at 1541 cm–1; the latter shows νco at 2108 cm–1." @default.
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• W2034778308 date "1994-01-01" @default.
• W2034778308 modified "2023-10-18" @default.
• W2034778308 title "Synthesis and structure of di- and tetra-copper(I) complexes bridged by pyridazine" @default.
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• W2034778308 doi "https://doi.org/10.1039/dt9940000603" @default.
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