PUMA publications for /user/b_schwederski/EPR;crystal%20spectroelectrochem;lumazinehttps://puma.ub.uni-stuttgart.de/user/b_schwederski/EPR;crystal%20spectroelectrochem;lumazinePUMA RSS feed for /user/b_schwederski/EPR;crystal%20spectroelectrochem;lumazine2024-03-29T13:20:59+01:00Structure, EPR and UV-VIS and IR spectroelectrochemistry of reversibly reducible compounds (C5Me5)IrCl(L)(PF6), L= 1,3-dimethyllumazine or 1,3-dimethylalloxazinehttps://puma.ub.uni-stuttgart.de/bibtex/288f1fd07a36d77993f3762901fa9bd14/b_schwederskib_schwederski2019-07-15T13:41:23+02:00EPR;crystal alloxazine complex complex;electrochem complex;flavin complex;pterin cyclopentadienyl cyclopentadienyl;EPR interaction iridium lumazine metal model;iridium model;spectroelectrochem prepn redn spectroelectrochem spectroelectrochem;lumazine spectroelectrochem;mol structure <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Oliver Heilmann" itemprop="url" href="/person/1461f2f1f5b4d79e898e657f0be455135/author/0"><span itemprop="name">O. Heilmann</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Fridmann M. Hornung" itemprop="url" href="/person/1461f2f1f5b4d79e898e657f0be455135/author/1"><span itemprop="name">F. Hornung</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Wolfgang Kaim" itemprop="url" href="/person/1461f2f1f5b4d79e898e657f0be455135/author/2"><span itemprop="name">W. Kaim</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Jan. Fiedler" itemprop="url" href="/person/1461f2f1f5b4d79e898e657f0be455135/author/3"><span itemprop="name">J. Fiedler</span></a></span></span>. </span><span class="additional-entrytype-information"><span itemtype="http://schema.org/PublicationIssue" itemscope="itemscope" itemprop="isPartOf"><em><span itemprop="journal">Journal of the Chemical Society, Faraday Transactions</span>, </em> <em><span itemtype="http://schema.org/PublicationVolume" itemscope="itemscope" itemprop="isPartOf"><span itemprop="volumeNumber">92 </span></span>(<span itemprop="issueNumber">21</span>):
<span itemprop="pagination">4233--4238</span></em> </span>(<em><span>1996<meta content="1996" itemprop="datePublished"/></span></em>)</span>Mon Jul 15 13:41:23 CEST 2019Journal of the Chemical Society, Faraday Transactions214233--4238Structure, EPR and UV-VIS and IR spectroelectrochemistry of reversibly reducible compounds [(C5Me5)IrCl(L)](PF6), L= 1,3-dimethyllumazine or 1,3-dimethylalloxazine921996EPR;crystal alloxazine complex complex;electrochem complex;flavin complex;pterin cyclopentadienyl cyclopentadienyl;EPR interaction iridium lumazine metal model;iridium model;spectroelectrochem prepn redn spectroelectrochem spectroelectrochem;lumazine spectroelectrochem;mol structure In an attempt to model possible metal-pterin or metal-flavin ligand interactions [(C5Me5)IrCl(L)](PF6) (L= 1,3-dimethyllumazine or 1,3-dimethylalloxazine) were prepd. and their structure, spectroscopy and spectroelectrochem. (EPR, IR, UV-visible) compared with results for the corresponding Rh analogs. The x-ray crystal structure of [(C5Me5)IrCl(DML)](PF6), DML = 1,3-dimethyllumazine, shows O4/N5 chelate coordination of Ir with a shorter bond to the N center [2.103(4) vs. 2.186(3) {\AA}], a slightly more unsym. situation than that found in the Rh analog. Electrochem. studies (cyclic voltammetry, polarog.) showed largely reversible 1-electron redn. processes to radical species [(C5Me5)IrCl(L)].bul. which allowed the authors to study the EPR, IR and UV-visible response to the redn. Although the EPR spectra of the Ir compds. remained unresolved, the low g factors (g{\textless}2) and particular line shapes revealed small but significant contributions from the heavy-metal center. Long-wavelength absorptions at $\sim$600 nm and low-energy shifts of the carbonyl stretching bands confirm the formulation [(C5Me5)IrIIICl(L-I)].bul. for the electronic situation. [on SciFinder(R)]