title: Calix[6]azacryptand Ligand with a Sterically Protected Tren-Based Coordination Site for Metal Ions.
abstract: A new calix[6]azacryptand ligand has been prepared in six steps starting from 1,3,5-trismethoxycalix[6]arene. An X-ray study shows that this ligand has a sterically protected tren-based binding site at the bottom of a polyaromatic bowl and ether sites around its rim. It binds Zn(2+) to give a complex in which zinc is in a trigonal bipyramidal geometry with a water bound in one apical position and two additional hydrogen-bonded waters that fill the calixarene cavity.
authors.affiliation: Laboratoire de Chimie Organique, Université Libre de Bruxelles (ULB) , Av. F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium.
authors.forename: Sara
authors.initials: S
authors.lastname: Zahim
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology , 6-331, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
authors.forename: Lasantha A
authors.initials: LA
authors.lastname: Wickramasinghe
authors.affiliation: Laboratoire de Chimie Organique, Université Libre de Bruxelles (ULB) , Av. F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium.
authors.forename: Gwilherm
authors.initials: G
authors.lastname: Evano
authors.affiliation: Laboratoire de Chimie Organique, Université Libre de Bruxelles (ULB) , Av. F. D. Roosevelt 50, CP160/06, B-1050 Brussels, Belgium.
authors.forename: Ivan
authors.initials: I
authors.lastname: Jabin
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology , 6-331, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
authors.forename: Richard R
authors.initials: RR
authors.lastname: Schrock
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology , 6-331, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
authors.forename: Peter
authors.initials: P
authors.lastname: Müller