PUMA publications for /user/b_schwederski/potential;rednhttps://puma.ub.uni-stuttgart.de/user/b_schwederski/potential;rednPUMA RSS feed for /user/b_schwederski/potential;redn2024-03-29T14:01:38+01:00Electrochemistry and spectroelectrochemistry (EPR, UV-visible-near-IR) of platinum(II) 2,2'-bipyridine and ring-metalated bipyridine complexes: PtII(L-) and PtI(L-) but not PtI(L)https://puma.ub.uni-stuttgart.de/bibtex/2c59a9add849f1cb3755ec89db78d6ba1/b_schwederskib_schwederski2019-07-15T13:41:23+02:00ESR;platinum UV bipyridine complex dimethylbipyridine elec electrochem electroredn;dimethylaminobipyridine phenathroline platinum potential;redn pyridine redox reversible spectrum;diaminoethane <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Paul S. Braterman" itemprop="url" href="/person/1bf525096cdaf00f7b7cf2c0856c0819a/author/0"><span itemprop="name">P. Braterman</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Jae Inh Song" itemprop="url" href="/person/1bf525096cdaf00f7b7cf2c0856c0819a/author/1"><span itemprop="name">J. Song</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Franz M. Wimmer" itemprop="url" href="/person/1bf525096cdaf00f7b7cf2c0856c0819a/author/2"><span itemprop="name">F. Wimmer</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Smita Wimmer" itemprop="url" href="/person/1bf525096cdaf00f7b7cf2c0856c0819a/author/3"><span itemprop="name">S. Wimmer</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Wolfgang Kaim" itemprop="url" href="/person/1bf525096cdaf00f7b7cf2c0856c0819a/author/4"><span itemprop="name">W. Kaim</span></a></span>, </span><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Axel Klein" itemprop="url" href="/person/1bf525096cdaf00f7b7cf2c0856c0819a/author/5"><span itemprop="name">A. Klein</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="R. D. Peacock" itemprop="url" href="/person/1bf525096cdaf00f7b7cf2c0856c0819a/author/6"><span itemprop="name">R. Peacock</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">31 </span></span>(<span itemprop="issueNumber">24</span>):
<span itemprop="pagination">5084--5088</span></em> </span>(<em><span>1992<meta content="1992" itemprop="datePublished"/></span></em>)</span>Mon Jul 15 13:41:23 CEST 2019Inorganic Chemistry245084--5088Electrochemistry and spectroelectrochemistry (EPR, UV-visible-near-IR) of platinum(II) 2,2'-bipyridine and ring-metalated bipyridine complexes: PtII(L-) and PtI(L-) but not PtI(L)311992ESR;platinum UV bipyridine complex dimethylbipyridine elec electrochem electroredn;dimethylaminobipyridine phenathroline platinum potential;redn pyridine redox reversible spectrum;diaminoethane The Pt(II) complexes [Pt(bpy)(py)2]2+, [Pt(bpy)(Me2N-py)2]2+, [Pt(Me2-bpy)(py)2]2+, [Pt(bpy)(en)]2+, [Pt(Mebpy - H)(py)2]2+, [Pt(Mebpy - H)(bpy)]2+ (VI), [Pt(phen)(py)2]2+, and [Pt(py)4]2+ (VIII) (bpy, 2,2'-bipyridine; py, pyridine; Mebpy - H, N-methyl-2,2'-bipyridinium-3-yl-C,N'; Me2-bpy, 4,4'-dimethyl-2,2'-bipyridine; Me2N-py, 4-(dimethylamino)pyridine; en, 1,2-diaminoethane; phen, 1,10-phenanthroline) have been investigated by cyclic voltammetry and where possible by EPR spectroelectrochem. and by UV-vis-near-IR spectroelectrochem. All complexes except VIII show at least two reversible reductive one-electron processes; VI shows three, and VIII shows one chem. irreversible process. In all cases, the doubly reduced species showed the characteristic \textgreek{p}* $\rightarrow$ \textgreek{p}* UV-visible-near-IR absorptions of the ligand anion radicals. For the singly reduced species, EPR spectra show the added electron to be localized on the bipyridine-type ligand. However, the UV-visible-near-IR spectra of these species are not typical of ligand-based redn. products, and the potentials are less neg. than expected for such a process. It is concluded that the singly reduced species are best formulated as contg. Pt(II), with the semioccupied and/or th lowest unoccupied ligand orbitals (corresponding to the LUMO and SLUMO of the unreduced parent species) being perturbed by the presence of metal orbitals. The doubly reduced species, however, are straightforward anion radical complexes of Pt(I). [on SciFinder(R)]Polychlorinated biaryl heterocycles as potential ligands. Reactions between octachloro-1,10-phenanthroline and -2,2'-bipyridine with copper(I) and other metal ionshttps://puma.ub.uni-stuttgart.de/bibtex/2f40d32392fc6ebc1126eebb310fbe8da/b_schwederskib_schwederski2019-07-15T13:41:23+02:00attempted bipyridine chlorophenanthroline complex complex;ESR complex;phenanthroline complex;structure coordination copper perchloro potential potential;chlorophenanthroline potential;redn prepn prepn;crystal redn silver structure <span data-person-type="author" class="authorEditorList "><span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Chrisoph Titze" itemprop="url" href="/person/1929b52a4542d27dbf94b2234e1790b63/author/0"><span itemprop="name">C. Titze</span></a></span>, </span> and <span><span itemtype="http://schema.org/Person" itemscope="itemscope" itemprop="author"><a title="Wolfgang. Kaim" itemprop="url" href="/person/1929b52a4542d27dbf94b2234e1790b63/author/1"><span itemprop="name">W. Kaim</span></a></span></span>. </span><span class="additional-entrytype-information"><span itemtype="http://schema.org/PublicationIssue" itemscope="itemscope" itemprop="isPartOf"><em><span itemprop="journal">Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences</span>, </em> <em><span itemtype="http://schema.org/PublicationVolume" itemscope="itemscope" itemprop="isPartOf"><span itemprop="volumeNumber">51 </span></span>(<span itemprop="issueNumber">7</span>):
<span itemprop="pagination">981--988</span></em> </span>(<em><span>1996<meta content="1996" itemprop="datePublished"/></span></em>)</span>Mon Jul 15 13:41:23 CEST 2019Zeitschrift fuer Naturforschung, B: A Journal of Chemical Sciences7981--988Polychlorinated biaryl heterocycles as potential ligands. Reactions between octachloro-1,10-phenanthroline and -2,2'-bipyridine with copper(I) and other metal ions511996attempted bipyridine chlorophenanthroline complex complex;ESR complex;phenanthroline complex;structure coordination copper perchloro potential potential;chlorophenanthroline potential;redn prepn prepn;crystal redn silver structure Perchlorinated derivs. of 2,2'-bipyridine and 1,10-phenanthroline were prepd. and tested for their coordination behavior towards metal ions. Octachloro-1,10-phenanthroline (ocp) was obtained via chlorination with PCl5 under pressure (300°, 18 h). It fails to form stable complexes with Fe2+, Mn2+, Ru2+, Ni2+, Zn2+, or Cd2+, but yields complex cations [Cu(ocp)2]+ and [Ag(ocp)2]+. The crystal structure anal. of red [Cu(ocp)2]BF4 reveals a distorted tetrahedral coordination at Cu with a slight tendency towards the trigonal-pyramidal arrangement [monoclinic P21/c, a = 1157.70(10), b = 1615.0(2), c = 1980.8(3) pm, \textgreek{b} = 100.26°, V = 3644.3(8)·106 pm3, Z = 4, R1 = 0.0709, wR2 = 0.2010]. Two essentially planar ligands with small bite angles intersect at almost right angle. Relative to conventional bis(1,10-phenanthroline)copper complexes with similar structures, [Cu(ocp)2]+ has oxidn. and redn. potentials shifted by $\sim$+1 V which leaves the energy of the main MLCT absorption features little changed. Attempts to synthesize RuCl2(ocp)2 in DMF produced a sym. bis(dimethylamino)hexachloro-1,10-phenanthroline which was oxidized electrochem. in 2 steps. Octachloro-2,2'-bipyridine (ocb) showed no detectable complexation with Cu+ and a very neg. redn. potential, most probably due to its inability to exhibit a low-energy coplanar conformation. [on SciFinder(R)]