The reactions of the Schiff-base N,N-ethylenebis-(isonitrosoacetylacetoneimine), (H
2L), with Ni(II) acetate led to the formation of the yellow-orange complex LNi (
I) in water and the red complex LNi (
II) in ethanol. Both oximato groups in
I are coordinated to the metal through the oximino-oxygen whereas in
II one group is similarly coordinated while the other is coordinated through the oximino-nitrogen. Complex
I was converted to complex
II by boiling in chloroform and the conversion was reversed by reacting complex
II with either piperidine or ethylenediamine. H
2L neutralized by ammonia reacted with Ni(II) chloride (1:1) and the complex formed was characterized as the red square planar bis-(4-iminopentane-2,3-dione 3-oximato)Ni(II);(
III). This
trans complex reacted with piperidine (1:4) to produce its
cis configuration (
IV). Complex
III reacted with ethylenediamine (2:1) and 1,3-diaminopropane (1:1) to produce complexes
II and
V respectively of the identical structure. Attempted similar reaction (1:1) with either 1,4-diaminobutane or 1,5-diaminopentane led to the formation of the binuclear complexes
VI and
VII in which two molecules of complex
III are linked together by -(CH
2)
4- and -(CH
2)
5-Moieties respectively. The suggested structures of the square planar Ni(II) complexes are based on analytical, spectral and magnetic moment evidence.
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