Abstract
ESR has been used in the study of iron(I)-nitrosyl complexes with organic ligands in solution. Four types of complexes have been identified on basis of the ESR parameters, namely Fe (NO) L5, Fe (NO) L2, Fe (NO) 2L2, and Fe (NO) 2L. In the iron-nitrosyl complexes with the organic ligands used, the groups more often involved in the coordination are: - C -NH2; - C -NH; -C= O; and - C = S (eventually in the tautomeric forms). Urea and derivatives, either in water or in ethanol solutions, seem to give rise only to Fe (NO)2L2 type complexes. Similar results were obtained with phenylamino-derivatives and heterocycles. Equilibria between different types of complexes - Fe (NO) L2 and Fe (NO) 2L - were established with hydrazides and substituted hydrazides.
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