Coordination of an amino-phosphino macrocycle with(η 5-cyclopentadienyl)-and(η 5-pentamethylcyclopentadienyl)-iron complexes

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The coordination chemistry of a phospha-macrocycle meso-cis-2,10-diphenyl-6-aza-2,10-diphenylphabicyclo[9.40]pentadeca-11(1),12,14-triene (11-P 2NH) with (η 5-cyclopentadienyl)dicarbonyliodoiron and (η 5-pentamethylcyclopentadienyl)dicarbonyliodoiron was investigated. Thus 11-P 2NH reacts with CpFe(CO) 2I in benzene under photochemical conditions to yield a mixture of [ P, P′, N-(11-P 2NH)FeCp]I ( 2) and [ P, P′-(11-P 2NH)Fe(CO)Cp]I ( 3). Conversion of 3 into 2 was achieved by photochemical treatment of 3 in acetonitrile. The amine donor of the macrocycle in 2 was slowly transformed into a coordinating imine moiety. Similar behaviour was observed for the pentamethylcyclopentadienyl analogue. The crystal structure of [ P, P′, N-(11-P 2NH)FeCp★]I is determined.