Dinuclear cobalt(II) complexes of pyrazole ligands with chelating side arms

Publication type:
Journal article
Metadata:
Autoren
  • F Meyer
  • S Beyreuther
  • K Heinze
  • L Zsolnai
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:A1997WX74800009&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.1002/cber.19971300511
Externe Identifier
  • Clarivate Analytics Document Solution ID: WX748
ISSN
0009-2940
Ausgabe der Veröffentlichung
5
Zeitschrift
CHEMISCHE BERICHTE-RECUEIL
Schlüsselwörter
  • pyrazolate complexes
  • dinuclear complexes
  • bridging ligands
  • cobalt
  • conformational analysis
Paginierung
605 - 613
Datum der Veröffentlichung
1997
Status
Published
Titel
Dinuclear cobalt(II) complexes of pyrazole ligands with chelating side arms
Sub types
  • Article
Ausgabe der Zeitschrift
130

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:title>Abstract</jats:title><jats:p>A series of pyrazole‐based potential ligands bearing polydentate amine substituents in the 3‐ and 5‐positions of the heterocycle has been synthesized [3,5‐bis(R<jats:sub>2</jats:sub>NCH<jats:sub>2</jats:sub>)‐pyzH R<jats:sub>2</jats:sub>N = Me<jats:sub>2</jats:sub>N(CH<jats:sub>2</jats:sub>)<jats:sub>3</jats:sub>NMe (<jats:bold>2aH</jats:bold>), [Me<jats:sub>2</jats:sub>N(CH<jats:sub>2</jats:sub>)<jats:sub>3</jats:sub>]<jats:sub>2</jats:sub>N (<jats:bold>2bH</jats:bold>), (Et<jats:sub>2</jats:sub>NCH<jats:sub>2</jats:sub>CH<jats:sub>2</jats:sub>)<jats:sub>2</jats:sub>N (<jats:bold>2cH</jats:bold>)]. Upon reaction with two equivalents of CoCl<jats:sub>2</jats:sub> they form complexes LCo<jats:sub>2</jats:sub>Cl<jats:sub>3</jats:sub> (<jats:bold>3a</jats:bold>–<jats:bold>c</jats:bold>; L = <jats:bold>2a</jats:bold>–<jats:bold>c</jats:bold>, respectively) which are shown crystallographically to contain a dinuclear metal core bridged by both the pyrazolate unit and a chlorine atom, with each cobalt center carrying a further terminal chlorine atom. Two of the ligand side arms in <jats:bold>3b</jats:bold>, <jats:bold>c</jats:bold> are dangling, thus leading to five‐coordination of the cobalt(II) centers in all cases. Addition of two equivalents of NaBPh<jats:sub>4</jats:sub> to solutions of <jats:bold>3b</jats:bold>, <jats:bold>c</jats:bold> induced coordination of the formerly dangling side arms to the metal centers by substitution of the terminal chlorine atoms. The resulting compounds [LCo<jats:sub>2</jats:sub>Cl](BPh<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub> (<jats:bold>4b</jats:bold>, <jats:bold>c</jats:bold>, respectively) were characterized by X‐ray structure analyses. They can be viewed as dinuclear linked versions of tran‐type complexes [(tran = tris(aminoalkyl)amine] with distorted trigonal‐bipyramidal coordination spheres around cobalt(II). Conformational analyses employing force‐field calculations were carried out for <jats:bold>4b</jats:bold>, <jats:bold>c</jats:bold> in order to rationalize the conformations observed in the solid state with regard to the accessible conformational space.</jats:p>
Autoren
  • Franc Meyer
  • Stefan Beyreuther
  • Katja Heinze
  • Laszlo Zsolnai
DOI
10.1002/cber.19971300511
ISSN
0009-2940
Ausgabe der Veröffentlichung
5
Zeitschrift
Chemische Berichte
Sprache
en
Online publication date
2006
Paginierung
605 - 613
Datum der Veröffentlichung
1997
Status
Published
Herausgeber
Wiley
Herausgeber URL
http://dx.doi.org/10.1002/cber.19971300511
Datum der Datenerfassung
2023
Titel
Dinuclear Cobalt(II) Complexes of Pyrazole Ligands with Chelating Side Arms
Ausgabe der Zeitschrift
130

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