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- W2075838244 abstract "Abstract The compound [Cu(CN-acac)Me 2 en(Br)] (Me 2 en denotes N,N-dimethyl-1,2-diaminoethane) was prepared and investigated by means of structural (X-Ray diffraction) and spectroscopic (IR and electronic) measurements. The compound crystallizes in the monoclinic space group P 2 1 / c with a = 5.959(1) Å, b = 7.465(2) Å, c = 19.338(3) Å, β = 90.89(2)° and Z = 4. The structure consists of discrete [Cu(CN-acac)Me 2 en(Br)] monomeric units, in which copper is five-coordinated. The 1,2-diamine adopts the gauche conformation with a torsional angle of 51.31°, coordinates as bidentate ligand through the nitrogen atoms, and attains the λ configuration. The anion of the 3-cyano-2,4-pentanedione, CN-acac − , is bonded through the oxygen atoms and the six-membered metallocyclic ring exhibits a semi chair conformation. The nitrogen and oxygen donor atoms form a square plane. Copper is also bonded to the bromine atom and a distorted square pyramidal structure around copper exists. The inequalities in the Cu–N distances suggest a second-order Jahn-Teller deformation while the elongation of the Cu–Br bonds implicates d - s orbital mixing. The ligand field excitation energy is appreciably lower than that observed in the [Cu(CN-acac)Me 2 en] + entity. The principal stretching vibrations are assigned and discussed in the light of the structure." @default.
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- W2075838244 date "1995-02-01" @default.
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- W2075838244 title "Influence of coordinating anions on the stereochemistry of mixed-ligand copper (II) compounds. Crystal structure and spectra of bromo (3-cyano-2,4-pentanedionato) (N,N-dimethyl-1,2-diaminoethane)copper(II)" @default.
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- W2075838244 doi "https://doi.org/10.1524/zkri.1995.210.2.100" @default.
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