Authors: Marco Fioroni
Transition Metals (TM) are proposed to play a role in astrophysical environments in both gas and solid state astrochemistry by co-determining the homogeneous/heterogeneous catalysis represented by the gas/gas and gas/dust grain interactions. Their chemistry is function of temperature, radiation field and chemical composition and, as a consequence, dependent from the astrophysical object in which the TM are localized, i.e interstellar medium (ISM), molecular clouds, hot cores and corinos. Five main categories of TM compounds classified as: a) pure bulk and clusters; b) TM naked ions; c) TM oxides/minerals or inorganic; d) TM-L (L = ligand) with L = sigma and/or pi-donor/acceptor species like H/H2, N/N2, CO, H2O and e) TM-organoligands such as Cp, PAH, R1=°=°=R2 are proposed. Such variety of TM compounds opens the door to an enormous potential contribution to a fine astrochemical synthesis. Particular attention and interest has been applied to the chemistry of simple TM compounds with general formula: [TMm-Xy]+n with +n=total charge and X = non-TM element. Constraining the TM and the X elements on the basis of their reciprocal reactivity and cosmic abundances, the chemistry of TM = Fe coupled with N, O, S open the pathway to the correlated organic chemistry. In particular the chemistry of the iron molecular oxide [FeO]+1 and nitride [FeN]+1 will be analyzed, due to their ability to perform C-C and C-H bond activations, opening the pathway to the oxydation/hydroxylation and nitrogenation/amination of organic substrates contributing, for example, to explain the detected presence of NH, NH2 and CH3OH in diffuse gas, where actual gas-phase and grain surface chemical models cannot adequately explain the data. Summarizing the TM fine chemistry is expected to contribute to the known synthesis of organic compounds leading towards a new path in the astrochemistry field whose qualitative (type of compounds) and quantitative contribution must be unraveled.
Comments: 16 Pages.
Download: PDF
[v1] 2013-12-03 09:16:30
Unique-IP document downloads: 381 times
Vixra.org is a pre-print repository rather than a journal. Articles hosted may not yet have been verified by peer-review and should be treated as preliminary. In particular, anything that appears to include financial or legal advice or proposed medical treatments should be treated with due caution. Vixra.org will not be responsible for any consequences of actions that result from any form of use of any documents on this website.
Add your own feedback and questions here:
You are equally welcome to be positive or negative about any paper but please be polite. If you are being critical you must mention at least one specific error, otherwise your comment will be deleted as unhelpful.