Tetrahalo- and mixed tetrahalo-metallates of Co(II), Ni(II), Cu(II) and Zn(II) of the N-ethylmorpholinium cation were prepared and investigated by means of spectroscopic and magnetic measurements. While the cobalt(II), nickel(II) and zinc(II) complexes appear to be essentially, tetrahedral, the copper(II) complexes are discussed on the basis of a distorted ('flattened') tetrahedral symmetry. The electronic spectra of the complexes are assigned on this basis. The far i.r. spectra of the complexes show bands which are unambiguously assignable to the metal-halogen stretching modes. The effects of the counter cation on the geometry around the metal ion, compared with that of the morpholinium and piperidinium cations, are discussed in relation to the pKa of the amine.
Spectroscopic investigation of the cobalt(II), nickel(II), copper(II) and zinc(II) tetrahalometallates of the N-ethyl-morpholinium cation / Marcotrigiano, Giuseppe Onofrio; Menabue, Ledi; Pellacani, Gian Carlo. - In: TRANSITION METAL CHEMISTRY. - ISSN 0340-4285. - STAMPA. - 3:(1978), pp. 108-112. [10.1007/BF01393520]
Spectroscopic investigation of the cobalt(II), nickel(II), copper(II) and zinc(II) tetrahalometallates of the N-ethyl-morpholinium cation.
MARCOTRIGIANO, Giuseppe Onofrio;MENABUE, Ledi;PELLACANI, Gian Carlo
1978
Abstract
Tetrahalo- and mixed tetrahalo-metallates of Co(II), Ni(II), Cu(II) and Zn(II) of the N-ethylmorpholinium cation were prepared and investigated by means of spectroscopic and magnetic measurements. While the cobalt(II), nickel(II) and zinc(II) complexes appear to be essentially, tetrahedral, the copper(II) complexes are discussed on the basis of a distorted ('flattened') tetrahedral symmetry. The electronic spectra of the complexes are assigned on this basis. The far i.r. spectra of the complexes show bands which are unambiguously assignable to the metal-halogen stretching modes. The effects of the counter cation on the geometry around the metal ion, compared with that of the morpholinium and piperidinium cations, are discussed in relation to the pKa of the amine.
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