PUMA publications for /user/galaktoze/cationhttps://puma.ub.uni-stuttgart.de/user/galaktoze/cationPUMA RSS feed for /user/galaktoze/cation2024-03-29T08:57:30+01:00Complex Series Ru(tpy)(dpk)(X)n+ (tpy = 2,2': 6',2''-Terpyridine; dpk = 2,2'-Dipyridyl Ketone; X = Cl-, CH3CN, NO2-, NO+, NO.bul., NO-): Substitution and Electron Transfer, Structure, and Spectroscopyhttps://puma.ub.uni-stuttgart.de/bibtex/2fc43475cc109889bb85956b19cb03e2e/galaktozegalaktoze2018-08-09T10:59:25+02:00anion cation complex complex;nitrosyl dipyridyl electrochem ketone ligand nitroso nitrosyl oxidn precursor;kinetics prepn radical reactivity redox ruthenium terpyridine <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Sounak Sarkar" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/0"><span itemprop="name">S. Sarkar</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Biprajit Sarkar" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/1"><span itemprop="name">B. Sarkar</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Nripen Chanda" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/2"><span itemprop="name">N. Chanda</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Sanjib Kar" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/3"><span itemprop="name">S. Kar</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Shaikh M. Mobin" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/4"><span itemprop="name">S. Mobin</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Jan Fiedler" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/5"><span itemprop="name">J. Fiedler</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Wolfgang Kaim" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/6"><span itemprop="name">W. Kaim</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Goutam Kumar. Lahiri" itemprop="url" href="/person/1782ae3f55e983dd19539e0430e63537b/author/7"><span itemprop="name">G. Lahiri</span></a></span></span>. </span><span class="additional-entrytype-information"><span itemtype="http://schema.org/PublicationIssue" itemscope="itemscope" itemprop="isPartOf"><em><span itemprop="journal">Inorganic Chemistry</span>, </em> <em><span itemtype="http://schema.org/PublicationVolume" itemscope="itemscope" itemprop="isPartOf"><span itemprop="volumeNumber">44 </span></span>(<span itemprop="issueNumber">17</span>):
<span itemprop="pagination">6092--6099</span></em> </span>(<em><span>2005<meta content="2005" itemprop="datePublished"/></span></em>)</span>Thu Aug 09 10:59:25 CEST 2018Inorganic Chemistry176092--6099Complex Series [Ru(tpy)(dpk)(X)]n+ (tpy = 2,2': 6',2''-Terpyridine; dpk = 2,2'-Dipyridyl Ketone; X = Cl-, CH3CN, NO2-, NO+, NO.bul., NO-): Substitution and Electron Transfer, Structure, and Spectroscopy442005anion cation complex complex;nitrosyl dipyridyl electrochem ketone ligand nitroso nitrosyl oxidn precursor;kinetics prepn radical reactivity redox ruthenium terpyridine The complex framework [Ru(tpy)(dpk)]2+ (tpy = 2,2':6',2''-terpyridine, dpk = 2,2'-dipyridyl ketone) was used to study the generation and reactivity of the nitrosyl complex [Ru(tpy)(dpk)(NO)]3+ ([4]3+). Stepwise conversion of the chloro complex [Ru(tpy)(dpk)(Cl)]+ ([1]+) via [Ru(tpy)(dpk)(MeCN)]2+ ([2]2+) and the nitro compd. [Ru(tpy)(dpk)(NO2)]+ ([3]+) yielded [4]3+; all four complexes were structurally characterized as perchlorates. Electrochem. oxidn. and redn. were studied as a function of the monodentate ligand as were the IR and UV-visible spectroscopic responses (absorption/emission). The kinetics of the nitroso-to-nitro conversion [4]3+/[3]+ in aq. environment were also studied. Two-step redn. of [4]3+ was monitored via EPR, UV-visible, and IR (\textgreek{n}(NO), \textgreek{n}(CO)) spectroelectrochem. to confirm the {RuNO}7 configuration of [4]2+ and to exhibit a relatively intense band at 505 nm for [4]+, attributed to a ligand-to-ligand transition originating from bound NO-. [on SciFinder(R)]Radical ions. 9. Radical cations of tetrasilyl-substituted hydrazineshttps://puma.ub.uni-stuttgart.de/bibtex/24042f9105da2155daa4efa3a56c77253/galaktozegalaktoze2018-08-09T10:59:25+02:00ESR cation hydrazine radical silyl <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Hans Bock" itemprop="url" href="/person/1dceb05302e429e828e064632cf5f345f/author/0"><span itemprop="name">H. Bock</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Wolfgang Kaim" itemprop="url" href="/person/1dceb05302e429e828e064632cf5f345f/author/1"><span itemprop="name">W. Kaim</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="John W. Connolly" itemprop="url" href="/person/1dceb05302e429e828e064632cf5f345f/author/2"><span itemprop="name">J. Connolly</span></a></span></span>. </span><span class="additional-entrytype-information"><span itemtype="http://schema.org/PublicationIssue" itemscope="itemscope" itemprop="isPartOf"><em><span itemprop="journal">Angewandte Chemie</span>, </em> <em><span itemtype="http://schema.org/PublicationVolume" itemscope="itemscope" itemprop="isPartOf"><span itemprop="volumeNumber">88 </span></span>(<span itemprop="issueNumber">22</span>):
<span itemprop="pagination">766--767</span></em> </span>(<em><span>1976<meta content="1976" itemprop="datePublished"/></span></em>)</span>Thu Aug 09 10:59:25 CEST 2018Angewandte Chemie22766--767Radical ions. 9. Radical cations of tetrasilyl-substituted hydrazines881976ESR cation hydrazine radical silyl The difference of 14N coupling in bicyclic and open chain hydrazine radical cations (I and II) ($\sim$1.2G) is smaller than the difference of the corresponding coupling consts. for the alkyl derivs. (III and IV)(5.7G). The results were rationalized in terms of differences in SiNSi and CNC bond angles. [on SciFinder(R)]Widely Separated Reduction Processes of abpy-Coupled Areneosmium(II) Reaction Centers (abpy = 2,2'-Azobispyridine): Stabilization of the Radical Intermediate and of the Os0OsII Statehttps://puma.ub.uni-stuttgart.de/bibtex/26ea5ed9e751d121fcf7d05f0f28b635f/galaktozegalaktoze2018-08-09T10:59:25+02:00EPR arene azobispyridine binuclear bipyrimidine bridged cation complex complex;osmium diosmium mixed osmium potential;radical redox spectra valence <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Frank Baumann" itemprop="url" href="/person/1f4a36d58d4abd338c6d3bd6bb589fca0/author/0"><span itemprop="name">F. Baumann</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Wolfgang Kaim" itemprop="url" href="/person/1f4a36d58d4abd338c6d3bd6bb589fca0/author/1"><span itemprop="name">W. Kaim</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Gert Denninger" itemprop="url" href="/person/1f4a36d58d4abd338c6d3bd6bb589fca0/author/2"><span itemprop="name">G. Denninger</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Hans-Juergen Kuemmerer" itemprop="url" href="/person/1f4a36d58d4abd338c6d3bd6bb589fca0/author/3"><span itemprop="name">H. Kuemmerer</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Jan. Fiedler" itemprop="url" href="/person/1f4a36d58d4abd338c6d3bd6bb589fca0/author/4"><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">Organometallics</span>, </em> <em><span itemtype="http://schema.org/PublicationVolume" itemscope="itemscope" itemprop="isPartOf"><span itemprop="volumeNumber">24 </span></span>(<span itemprop="issueNumber">8</span>):
<span itemprop="pagination">1966--1973</span></em> </span>(<em><span>2005<meta content="2005" itemprop="datePublished"/></span></em>)</span>Thu Aug 09 10:59:25 CEST 2018Organometallics81966--1973Widely Separated Reduction Processes of abpy-Coupled Areneosmium(II) Reaction Centers (abpy = 2,2'-Azobispyridine): Stabilization of the Radical Intermediate and of the Os0OsII State242005EPR arene azobispyridine binuclear bipyrimidine bridged cation complex complex;osmium diosmium mixed osmium potential;radical redox spectra valence Mono- and binuclear 2,2'-azobispyridine and 2,2'-bipyrimidine-bridged osmium arene complexes were prepd.; their redox reactions afford mixed-valence odd-electron intermediates, which structure was evaluated by EPR spectra. Electrochem. reactivity patterns were established by cyclic voltammetry, EPR, and UV/vis spectroelectrochem. for the transition [(C6Me6)ClOs]+/[(C6Me6)Os] in mononuclear and dinuclear complexes with the 2,2'-azobispyridine (abpy) and 2,2'-bipyrimidine (bpym) bridging ligands. The isolated electron reservoir intermediate {[(μ-abpy)OsCl(C6Me6)]2}.bul.+ could be analyzed by X band and W band EPR with regard to 189Os hyperfine splitting and g anisotropy as an abpy anion radical species with significant contribution from the metal centers. The function of the \textgreek{p}-conjugated acceptor ligand in mediating the interaction between two equiv. electron and atom transfer sites was analyzed through simulation of the cyclic voltammograms. In comparison with the system bridged by 2,2'-bipyrimidine, the dinuclear abpy complex displays a much stronger interaction between the two organometallic reaction centers, as illustrated by the 1.14 V vs. 0.42 V splitting between the redox potentials sepg. the two chloride-dissociative processes, i.e., stabilizing the Os0OsII mixed-valent form [(Me6C6)Os(\textgreek{m}-abpy)OsCl(C6Me6)]+. This result parallels the observations made for (C5Me5)Rh- and (C5Me5)Ir-contg. analogs and for the coupling of pure electron transfer centers through such bridging ligands. [on SciFinder(R)]