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3 d Metal perchlorate complexes with quinoxaline 1-oxide[1]
Journal article

3 d Metal perchlorate complexes with quinoxaline 1-oxide[1]

D.E. Chasan, L.L. Pytlewski, C. Owens and N.M. Karayannis
Journal of inorganic & nuclear chemistry, v 39(4), pp 585-590
1977
DOI: https://doi.org/10.1016/0022-1902(77)80569-1

Abstract

Hexacoordinated 3 d metal perchlorate complexes with quinoxaline 1-oxide(N-QxO) were prepared and characterized by means of spectral and magnetic studies. Several of the new complexes involve exclusively oxygen-bonded unidentate N-QxO ligands and are probably of the types: [Cr(N-QxO) 4(OH 2)(OClO 3)](ClO 4) 2·5H 2O; [Fe(N-QxO) 3(OH 2)(OClO 3) 2](ClO 4); and [M(N-QxO) 4(OH 2) 2](ClO 4) 2· xH 2O (MFe, Co, c Ni; x = 1 for Co; x = 6 for Fe or Ni). The rest of the new complexes contain some N- and some O-bonded N-QxO groups; likely formulations for these compounds are: [ Mn(ONC 8H 6N) n(NC 8H 6NO) 5−n(OClO 3)](ClO 4)·4H 2O ; [ Zn(ONC 8H 6N) m(NC 8H 6NO) 3−n(OH 2) 3](ClO 4) 2 ; [ Cu(ONC 8H 6N)(NC 8H 6NO)(OH 2) 2(O 2ClO 2)](ClO 4)·H 2O; and [ NC 8H 6NO) y(ONC 8H 6N) 3−y(O 3ClO)Cu(NQxO) 2Cu(OClO 3)(NC 8H 6N) 3−y(ONC 8 6N) y](ClO 4) 2·4H 2O . The latter complex is apparently the only binuclear compound of the series, involving two O-bonded bridging N-QxO ligands, as suggested by its subnormal magnetic moment (0.99 μB). The Fe(III) compound also shows a subnormal μ eff (2.61 μB), which was attributed to spin-state equilibria, while the rest of the new complexes with paramagnetic metal ions are magnetically normal high-spin compounds.

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