Organometallic iron (II) hydrazines and hydrazones - Syntheses, characterisations and the X-ray crystal structures of [Fe(η5-Cp)(η6-C6H5NHNH 2)]+PF6 - and [Fe(η5 -Cp)(η6-p-MeC6H4NHN=CMe2)] +PF6 -

Abstract

The three new organometallic hydrazines [Fe(η5-Cp)(η6-RC6H4NHNH 2)]+PF6 -, Cp=C5H5, R=H, [1]+PF6 -; m-Me, [2]+PF6 -; p-MeO, [3]+PF6 -, were synthesised and characterised. They were obtained in CH2Cl2 by reaction of the hydrazine monohydrate, NH2NH2·H2O, with the corresponding precursors [Fe(η5-Cp)(η6-RC6H4Cl)] +PF6 -. Similarly to free conventional organic hydrazines, the organometallic hydrazines [1]+PF6 - and [3]+PF6 - react with acetone affording hydrazones formulated as [Fe(η5-Cp)(η6-RC6H 4NHN=CMe2)]+PF6 -, R=H, [6]+PF6 -; p-MeO, [7]+PF6 -. Likewise, the two other organometallic hydrazones containing the substituent groups R=0-Cl, [8]+PF6 - and p-Me, [9]+PF6 - were also obtained from their parent hydrazine precursors [4]+PF6 - and [5]+PF6 -, respectively. All the new compounds were characterised by elemental analysis and IR, UV - vis, 1H- and 13C-NMR spectroscopy. The crystalline and molecular structures of [1]+PF6 - and [9]+PF6 - were determined by single crystal X-ray crystallogr