@article{Kettunen2005Alter-23695,
  year={2005},
  doi={10.1002/ejic.200400913},
  title={Alternative coordination modes in palladium(II)-diimino-bispyridine complexes with an axially chiral biphenyl backbone},
  number={6},
  volume={2005},
  issn={1434-1948},
  journal={European Journal of Inorganic Chemistry},
  pages={1081--1089},
  author={Kettunen, Mika and Vedder, Christoph and Brintzinger, Hans-Herbert and Mutikainen, Ilpo and Leskelä, Markku and Repo, Timo}
}

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    <dcterms:title>Alternative coordination modes in palladium(II)-diimino-bispyridine complexes with an axially chiral biphenyl backbone</dcterms:title>
    <dc:contributor>Mutikainen, Ilpo</dc:contributor>
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    <dc:contributor>Kettunen, Mika</dc:contributor>
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    <dcterms:bibliographicCitation>European Journal of Inorganic Chemistry ; (2005), 6. - S. 1081-1089</dcterms:bibliographicCitation>
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    <dc:creator>Leskelä, Markku</dc:creator>
    <dc:contributor>Brintzinger, Hans-Herbert</dc:contributor>
    <dc:creator>Brintzinger, Hans-Herbert</dc:creator>
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    <dc:contributor>Vedder, Christoph</dc:contributor>
    <dc:creator>Kettunen, Mika</dc:creator>
    <dc:contributor>Leskelä, Markku</dc:contributor>
    <dc:creator>Repo, Timo</dc:creator>
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    <dc:creator>Mutikainen, Ilpo</dc:creator>
    <dcterms:abstract xml:lang="eng">The chiral biphenyl-bridged diimino-bispyridine ligandsN,N′-(6,6′-dimethylbiphenyl-2,2′-diyl)bis(2-pyridylmethyl)-diimine(1)and N,N′-(6,6′-dimethylbiphenyl-2,2′-diyl)bis[(6-methyl-2-pyridyl)methyl]diimine (2) react with Pd(COD)Cl&lt;sub&gt;2&lt;/sub&gt; to give, depending on the reaction conditions, either mono- or binuclear PdCl&lt;sub&gt;2&lt;/sub&gt; complexes. In the binuclear complex 1-(PdCl&lt;sub&gt;2&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;, the Pd nuclei are held at a distance of 3.37 Å by the ligand backbone. N,N′-(6,6′-dimethylbiphenyl-2,2′-diyl)bis[(5-methyl-2-furyl)methyl]diimine (3), with furyl instead of pyridyl rings, gives mononuclear, C&lt;sub&gt;2&lt;/sub&gt;-symmetric complexes only. Reactions of [Pd(NCCH&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;4&lt;/sub&gt;]&lt;sup&gt;2+ &lt;/sup&gt;(BF&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;–&lt;/sup&gt;)&lt;sub&gt;2&lt;/sub&gt; with ligand 1 or 3 give the C&lt;sub&gt;2&lt;/sub&gt;-symmetric cations [1-Pd]&lt;sup&gt;2+&lt;/sup&gt;or [3-Pd(NCCH&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;]&lt;sup&gt;2+&lt;/sup&gt; respectively, as their BF&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;–&lt;/sup&gt; salts. Solid-state structures of the chloride complexes 1-PdCl&lt;sub&gt;2&lt;/sub&gt;, 1-(PdCl&lt;sub&gt;2&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt; and 3-PdCl&lt;sub&gt;2&lt;/sub&gt;, and of the complex cations [1-Pd]&lt;sup&gt;2+&lt;/sup&gt; and [3-Pd(NCCCH&lt;sub&gt;3&lt;/sub&gt;)2]&lt;sup&gt;2+&lt;/sup&gt; with tetradentate and bidentate ligand coordination, respectively, all show square-planar coordination, with some distortion toward tedrahedral geometry due to the twisted biaryl-backbone. Preliminary observations on norbornene polymerization with the catalysts 1-PdCl&lt;sub&gt;2&lt;/sub&gt;/MAO, 2-PdCl&lt;sub&gt;2&lt;/sub&gt;/MAO and [(3-Pd(NCCH&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;]&lt;sup&gt;2+&lt;/sup&gt; suggest that a certain degree of stereoregularity of the polymers is induced by these chiral catalysts.</dcterms:abstract>
    <dc:creator>Vedder, Christoph</dc:creator>
    <dc:language>eng</dc:language>
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