Salan complexes of the group 12, 13 and 14 elements

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Abstract

Although derived from the well-known and heavily utilized SalenH2 ligands, the SalanH4 ligands (N,N′-bis(o-hydroxybenzyl)-o-diaminoalkyl (or aryl)) have not been historically developed with regards to the main group elements. This situation has been drastically changed over the past four years, with the report of new complexes of the SalanH4 ligands incorporating the group 12, 13 and 14 elements. This review will outline the various types of complexes that are currently available as well as provide guidance for future studies. Complexes having a metal-to-ligand stoichiometry of 1:1, 2:1 and 3:1 are known. The 1:1 complexes are of two types. They include the group 12 and 14 elements SalanH2M (where M = Zn and Sn), and the group 13 elements, SalanH2MR (where M = Al; R = Me). The structures of the zinc compounds are characterized by the incorporation of significant numbers of hydrogen bonded solvent. The second type are the unique anions of formula, [SalanAl(Li(THF)2)]2. The 2:1 complexes, SalanHMR(MR2) (where M = Al and R = Me, NMe2) can adopt one of two isomeric (cis or trans) forms. The heating of concentrated samples of some of these leads to the formation of the dimeric condensation products, [SalanMR(MR2)]2. The 3:1 complexes, SalanMR(MR2)2 (where M = Al, Ga; R = Me, Et, iBu) can also adopt either a cis or a trans geometry. The spectroscopic characterization of the trimetallics shows them to be non-fluxional in solution. Moreover, those that incorporate either Salophan or Salomphan exhibit anisotropic ring current effects.

Original languageEnglish
Pages (from-to)267-296
Number of pages30
JournalCoordination Chemistry Reviews
Volume165
DOIs
StatePublished - Oct 1997

Bibliographical note

Funding Information:
The three l~ople who contributed most to the work de~ribed in this review are Kyli Martin, Drew Rutherford and Jolin Jegier. Particular no~e should be made of D~w for whom seve~al of these s~tio~s co~stituted chapte~'~ in his Ph,D. thesis, Several other graduate students, Randy Pitura, David Thweatt, R yan Winburn and Michael Remington contributed techni~l assistan~ during their research formations, A humor of undergraduate re,archers provided critical assistance in the pre~ra° tion of many of the ligands, They are,, Jessica Benson, Ned Lindholm, Michael Monger and Amy Singer, Financial support was provided by the National Science Foundation (Grant ~52892) the donors of the Petroleum Res~h Fund (Grant 3~57-G3), adminis-te~ by the American Chemical S~iety and Praxair Surface Technologies, Inc, The r~ipt of an NSF°CAREER award is also gratefully acknowle~lged (1996~2000).

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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