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Linear, Divergent Molecular Receptors – Subtle Effects of Transition Metal Coordination Geometry
Author(s) -
Bilyk Alexander,
Hall Annegret K.,
Harrowfield Jack M.,
Hosseini Mir Wais,
Mislin Gilles,
Skelton Brian W.,
Taylor Christopher,
White Allan H.
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(200005)2000:5<823::aid-ejic823>3.0.co;2-z
Subject(s) - chemistry , transition metal , coordination geometry , coordination complex , receptor , stereochemistry , nanotechnology , metal , crystallography , geometry , molecule , catalysis , organic chemistry , biochemistry , hydrogen bond , mathematics , materials science
Reaction between deprotonated p ‐ tert ‐butyltetrathiacalix[4]arene and Co II or Zn II under strictly defined conditions leads to the formation of sandwich species in which a trimetallic unit is held between two opposed, divergently oriented, staggered O‐ and S ‐bound calixarene ligands in the cone conformation. Despite the isomorphous nature of the crystalline compounds, there is a subtle difference in the coordination of Co II and Zn II , presumably related to the differences in metal radius and electron configuration combined with structural restrictions imposed by the calixarene framework, in that whereas all three Co atoms may be considered six‐coordinate (and approximately octahedral), only two of the Zn atoms appear so, the third being five‐coordinate and more nearly trigonal bipyramidal in its coordination geometry.