Structure investigation of dimethyl-aluminium, -gallium and -indium O,O'-chelate complexes in solution and the solid state. Molecular structure of five-co-ordinated [Me2M(µ-OC6H4CO2Me-2)]2 adducts

Janusz Lewiński , Janusz Zachara , Kazimierz Starowieyski

Abstract

The reaction of trimethyl-aluminium, -gallium and -indium with an equimolar amount of methyl salicylate, 2-(HO)C 6 H 4 CO 2 Me (Hmesal), gives [ Me 2 M(mesal) ] n chelate complexes in high yield (where n = 1 or 2, M = Al 1 or Ga 2 ; n = 2, M = In 3 ). The resulting compounds have been characterised in solution by NMR and IR spectroscopy as well as by cryoscopic molecular weight determinations in benzene; their molecular structures in the solid state were determined by single-crystal X-ray diffraction techniques. All three compounds are dimeric in the solid state, with five-co-ordinated metal centres. The deformation of the metal centre co-ordination sphere is discussed. In solution compounds 1 and 2 are monomeric, four-co-ordinated chelate complexes while 3 retains its dimeric structure. On the basis of the structural observation resulting from this study and with respect to related compounds the following sequence of the Group 13 metal centre Lewis acidity, in four-co-ordinated diorganometallic O , O 9 -chelate complexes is proposed: In > Al > Ga.
Author Janusz Lewiński (FC / DCOC)
Janusz Lewiński,,
- Department Of Catalysis And Organometallic Chemistry
, Janusz Zachara (FC / CICSST)
Janusz Zachara,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Kazimierz Starowieyski (FC / LTP)
Kazimierz Starowieyski,,
- Laboratory Of Technological Processes
Journal seriesDalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry , ISSN 1477-9226
Issue year1997
Pages4217-4222
ASJC Classification1604 Inorganic Chemistry
DOIDOI:10.1039/A703766J
URL http://pubs.rsc.org/en/content/articlepdf/1997/dt/a703766j?page=search
Internal identifier1624
Languageen angielski
File
dalton 1997.pdf 131.61 KB
Score (nominal)35
Score sourcejournalList
Publication indicators Scopus Citations = 28; WoS Citations = 29; Scopus SNIP (Source Normalised Impact per Paper): 1999 = 1.139; WoS Impact Factor: 2006 = 3.012 (2) - 2007=3.138 (5)
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