A first radical cation chelate ligand: Electron paramagnetic resonance spectra of singly reduced 3,3'-diazamethylviologen, DAMV.+ and the rhenium(I) complex(DAMV.+)Re+(CO)3(PPh3)2+
Diquaternization of 4,4'-bipyrimidine with Me or Et in the 1,1'-position leads to 3,3'-diaza analogs of the well known methylviologen redox system. The radical cation intermediates of the new redox systems are formed at less neg. potentials, they display higher stability consts. and absorption energies in the visible. EPR measurements and hyperfine anal. based on HMO/McLachlan calcns. of p spin populations reveal how the overall spin distribution is affected by the introduction of addnl. nitrogen centers. The increased stability of the radical cation and the availability of two metal chelating coordination centers allows one to use this system as a cationic spin label ligand for metal centers. The paramagnetic complex with Re+(CO)3(PPh3) thus displays a fairly well resolved EPR spectrum, dominated by a relatively small 185,187Re isotope coupling. on SciFinder(R)
%0 Journal Article
%1 Matheis.1990
%A Matheis, Walter
%A Kaim, Wolfgang.
%D 1990
%J Journal of the Chemical Society, Faraday Transactions
%K ESR carbonyl complex diazamethylviolgen phenylphosphine rhenium
%N 19
%P 3337--3339
%R 10.1039/FT9908603337
%T A first radical cation chelate ligand: Electron paramagnetic resonance spectra of singly reduced 3,3'-diazamethylviologen, DAMV.+ and the rhenium(I) complex(DAMV.+)Re+(CO)3(PPh3)2+
%V 86
%X Diquaternization of 4,4'-bipyrimidine with Me or Et in the 1,1'-position leads to 3,3'-diaza analogs of the well known methylviologen redox system. The radical cation intermediates of the new redox systems are formed at less neg. potentials, they display higher stability consts. and absorption energies in the visible. EPR measurements and hyperfine anal. based on HMO/McLachlan calcns. of p spin populations reveal how the overall spin distribution is affected by the introduction of addnl. nitrogen centers. The increased stability of the radical cation and the availability of two metal chelating coordination centers allows one to use this system as a cationic spin label ligand for metal centers. The paramagnetic complex with Re+(CO)3(PPh3) thus displays a fairly well resolved EPR spectrum, dominated by a relatively small 185,187Re isotope coupling. on SciFinder(R)
@article{Matheis.1990,
abstract = {Diquaternization of 4,4'-bipyrimidine with Me or Et in the 1,1'-position leads to 3,3'-diaza analogs of the well known methylviologen redox system. The radical cation intermediates of the new redox systems are formed at less neg. potentials, they display higher stability consts. and absorption energies in the visible. EPR measurements and hyperfine anal. based on HMO/McLachlan calcns. of \textgreek{p} spin populations reveal how the overall spin distribution is affected by the introduction of addnl. nitrogen centers. The increased stability of the radical cation and the availability of two metal chelating coordination centers allows one to use this system as a cationic spin label ligand for metal centers. The paramagnetic complex with Re+(CO)3(PPh3) thus displays a fairly well resolved EPR spectrum, dominated by a relatively small 185,187Re isotope coupling. [on SciFinder(R)]},
added-at = {2019-07-15T13:41:23.000+0200},
author = {Matheis, Walter and Kaim, Wolfgang.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/24c5fb76da4a8c8a71b96096935f288bc/b_schwederski},
doi = {10.1039/FT9908603337},
interhash = {1fde99db3db1284c3fa9e61b17ffd779},
intrahash = {4c5fb76da4a8c8a71b96096935f288bc},
issn = {0956-5000},
journal = {Journal of the Chemical Society, Faraday Transactions},
keywords = {ESR carbonyl complex diazamethylviolgen phenylphosphine rhenium},
number = 19,
pages = {3337--3339},
timestamp = {2019-07-15T11:42:10.000+0200},
title = {A first radical cation chelate ligand: Electron paramagnetic resonance spectra of singly reduced 3,3'-diazamethylviologen, DAMV.+ and the rhenium(I) complex[(DAMV.+)Re+(CO)3(PPh3)]2+},
volume = 86,
year = 1990
}
