Abstract
The infrared and electronic excitation spectra of a series of new nickel(II) chelates containing anα-diimine (or nitrogenous base, enR) and the anion of aΒ-dione (1,3-ketoenol or 1,3-ketoester,ΒH) were obtained in the solid state and in solution. The composition and the overall structure of the new chelates in the solid state depends on ligand concentration, the substituents within theΒ-dionato moiety and the counterion present. The IR and electronic excitation spectra of [Ni(enR)2 Β]NO3 and [Ni(enR)Β(O2NO)] indicate, in conjunction with other physicochemical measurements, bidentate coordination of the ligands, while the spectral shifts reveal replacement of the (O,O′)nitrato group by basic solvents. The existence of the nickel(II) in an octahedral environment is confirmed by an X-ray structure analysis of [Ni(dpamH)2acac]NO3 · CH3OH (monoclinic, space groupP2l/n, a=17.296(1),b=7.462(1),c=21.604(3) å,Β=95.65(1)‡,Z=4, R=0.0534,Rw=0.0600), where dpamH denotes the 2,2′-dipyridylamine.
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Uddin, M., Hatzidimitriou, A.G., Lalia-Kantouri, M. et al. Influence of conjugated nitrogenous bases on the spectra and structure of mixed-ligand nickel(II) chelates containing β-diones. Struct Chem 8, 131–139 (1997). https://doi.org/10.1007/BF02262848
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DOI: https://doi.org/10.1007/BF02262848