A Bridge-bond Isomerism. X-Ray Crystal Structure, Spectral and Magnetic Properties of Two Dinuclear Isomeric Complexes (bipyo = 2,2'-bipyridine N,N'-dioxide)

Article abstract of DOI:10.1039/DT9910001385

Copper(II) chloride reacts with 2,2'-bipyridine N,N'-dioxide (bipyo), in methanolic solution, in a manner depending on the reaction conditions (temperature, ligand: metal ion ratio, concentration, etc.) to form different products.Two of them, a green and a yellow-orange isomer of , have been characterized by elemental microanalysis, electronic, IR and ESR spectra and magnetic susceptibility measurements.The crystal and molecular structures of both isomers have been determined from X-ray diffractometer data by the heavy-atom method and refined by full-matrix least-squares.The structures of the green and yellow-orange isomers, respectively, have been refined to R=0.054 (for 1366 reflections) and 0.063 (for 1283 reflections): green isomer, triclinic, space group P<*>, a= 8.664(2), b=8.732(2), c=9.099(3) Angstroem, α=95.62(2), β=107.04(2), γ=114.05(2) deg, and Z=1; yellow-orange isomer, monoclinic, space group P2₁/c, a=7.912(2), b=9.878(2), c=15.086(3) Angstroem, β=99.86(2) deg and Z=2.Both crystal structures comprise centrosymmetric dimeric molecules.The copper(II) atoms of the green isomer are bridged by two chlorine atoms, those of the orange-yellow isomer by the oxygen atoms of two bipyo ligands.

Full text of DOI:10.1039/DT9910001385

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