Abstract
The copper(II) complex [Cu{( R,R)- 1}] in which ( R)-H 2 1 is 1,6-bis(3-ethoxy-2-hydroxyphenyl)-(3 R,4 R)-(−)-cyclohexane-1,2-diyl-2,5-diazahexa-1,5-diene possesses an O 4-donor cavity that can bind Pb 2+, Cd 2+ and Eu 3+. The single crystal structures of [Cu(OH 2){( R,R)- 1}Pb(ONO 2) 2], {[Cu{( R,R)- 1}Cd(ONO 2)(OH 2) 2][NO 3] . MeOH} . [Cu{( R,R)- 1}] and [Cu{( R,R)- 1}Eu(O 2NO) 3] are presented. The co-crystallization of [Cu{( R,R)- 1}Cd(ONO 2)(OH 2) 2][NO 3] and [Cu{( R,R)- 1}] appears to be driven by hydrogen-bonded host–guest interactions between each axial water ligand in [Cu{( R,R)- 1}Cd(ONO 2)(OH 2) 2] + with the O 4-domain of [Cu{( R,R)- 1}]. When the ligand scaffold is changed from cyclohexane-1,2-diyl to 1,1′-binaphthyl to give ( R)-H 2 2, the N 2O 2-cavity is unable to bind copper(II) in its preferred square planar environment. The single crystal structure of [Zn{( R)- 2}] confirms the presence of tetrahedral zinc(II). As a result, the spatial properties of the ethoxy arms in [Zn{( R)- 2}] and [Cu{( R)- 2}] are not suited to the facile formation of dimetallic complexes.
Published Version
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