Mössbauer Study of Dehydro-N N′ N″-Trialkylguanidino-hexacarbonyldi-iron(O) and Related Compounds

Abstract
The application of recoilless gamna ray absorption (Mössbauer effect) to organometallic chemistry dates back well over ten years, and its progress is described in a number of review articles and texts. 1–4 The usefulness of this tool has been enhanced by the elaboration of the concept of the additivity of isomer shifts from each of the bonds to a Mössbauer atom, i.e., partial isomer shifts.5 Partly in order to elucidate structural information, but mainly in an effort to study the bonding properties involving the iron atom, Mössbauer studies of the iron carbonyls and their more complex derivatives have been undertaken.6–8 In these compounds, the iron atoms have coordination number six and oxidation number of zero.