PUMA publications for /user/b_schwederski/organoboron;nitrogen%20organoboron%20radicalhttps://puma.ub.uni-stuttgart.de/user/b_schwederski/organoboron;nitrogen%20organoboron%20radicalPUMA RSS feed for /user/b_schwederski/organoboron;nitrogen%20organoboron%20radical2024-03-28T11:45:53+01:00Organoboron substituent effects in EPR/ENDOR spectroscopy. Radical ions with boron-carbon and boron-nitrogen bondshttps://puma.ub.uni-stuttgart.de/bibtex/2e52d96d8808cb12ec083a2a38ed13f55/b_schwederskib_schwederski2019-07-15T13:41:23+02:00ENDOR ENDOR;carbon ESR bond boron effect ion ion;ESR organo organoboron organoboron;nitrogen radical substituent <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Alexander Lichtblau" itemprop="url" href="/person/1ef95918293466c1d3ed653afae77fe36/author/0"><span itemprop="name">A. Lichtblau</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Wolfgang Kaim" itemprop="url" href="/person/1ef95918293466c1d3ed653afae77fe36/author/1"><span itemprop="name">W. Kaim</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Andreas Schulz" itemprop="url" href="/person/1ef95918293466c1d3ed653afae77fe36/author/2"><span itemprop="name">A. Schulz</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Thomas. Stahl" itemprop="url" href="/person/1ef95918293466c1d3ed653afae77fe36/author/3"><span itemprop="name">T. Stahl</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, Perkin Transactions 2: Physical Organic Chemistry</span>, </em> </span>(<em><span>1992<meta content="1992" itemprop="datePublished"/></span></em>)</span>Mon Jul 15 13:41:23 CEST 2019Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry91497--1501Organoboron substituent effects in EPR/ENDOR spectroscopy. Radical ions with boron-carbon and boron-nitrogen bonds1992ENDOR ENDOR;carbon ESR bond boron effect ion ion;ESR organo organoboron organoboron;nitrogen radical substituent The consequences of R3B coordination (R = Me, Et, cyclohexyl) to nitrogen-contg. anion radicals and of Mes2B substitution (Mes = mesityl) at C or N \textgreek{p} centers of radical ions were studied for a series of closely related carbo- and heterocyclic \textgreek{p} systems by ESR/ENDOR spectroscopy. Examples include the anion radicals of dinuclear R3B coordination compds. with pyrazine and 4,4'-bipyridine, para-diboryl-substituted benzene, and biphenyl radical anions and the correspondingly substituted 1,4-dihydropyrazine and 1,1'-dihydro-4,4'-bipyridine radical cations. Whereas the perturbation of spin distribution is most pronounced for the dimesitylboryl-substituted homoarom. anions, the isoelectronic cations of the non-arom. Mes2B-substituted dihydroheterocyles exhibit a substantial decrease of the heteronuclear (11B, 14N) ESR/ENDOR coupling consts. owing to a considerable degree of B/N \textgreek{p} bonding. MO/McLachlan perturbation calcns. suggest that both the orbital overlap and the electronegativity differences contribute to the obsd. effects. [on SciFinder(R)]