Dimorphs of ethane>dichloronickel(II)

Article abstract of DOI:10.1039/DT9930003767

The two known forms, A and B, of <1,2-bis(diphenylphosphino)ethane>dichloronickel(II), , were synthesized and identified by IR spectroscopy.The spectra showed that form A had a lower symmetry than form B.The forms were also found to differ by solid-state 31P NMR spectroscopy and powder X-ray diffraction, but the solution properties were identical.The IR spectrum of the dichloromethane solvate of was the same as that of form B but with a strong additional band due to CH2Cl2.The X-ray diffraction pattern from this sample matched that calculated for a previously published crystal structure of *CH2Cl2, thus identifying the form used in that work.Crystals of form A obtained from acetone were used for a single-crystal X-ray structure determination.Comparison of the molecular structures showed that both forms have the same chelate-ring conformation (δ) but differ in the orientations of the phenyl rings.There is a non-crystallographic two-fold axis in form B which is absent from A, explaining the additional bands present in the IR spectrum of the latter.Solid-state 31P NMR was better than IR spectroscopy at distinguishing the two forms from each other and from mixtures.

Full text of DOI:10.1039/DT9930003767

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