Heteroligand Molecular “Stirrups” Using Conformationally Flexible Ditopic Pyridyl−Pyrazolyl Ligands
摘要:
Heteroligand molecular "stirrups" form by the self-assembly of flexible ditopic ligands in combination with 4,4'-bipyridine and [(dppp)Pd)](2+). Crystallographic analysis shows that the ligands, bis[3-(4-pyridyl)pyrazolyl]-m-xylene (mXy(4py3pz)) and bis[4-(4-pyridyl)pyrazolyl]-p-xylene (pXy(4py4pz)) form complexes of the type [{(dppp)Pd}(2)(4.4'-bipy)(L)]center dot 4OTf (1 center dot 4OTf and 2 center dot 4OTf, respectively) in the solid state, with remarkably similar structures considering the differences in substitution patterns between the two ligands. The self-assembly of both 1(4+) and 2(4+) is assisted by face-to-face pi interactions on the exterior of the macrocycle between the phenyl rings of the dppp ligands and the pyridyl groups of the ditopic ligands.
Heteroligand Molecular “Stirrups” Using Conformationally Flexible Ditopic Pyridyl−Pyrazolyl Ligands
作者:Jinzhen Lu、David R. Turner、Lindsay P. Harding、Stuart R. Batten
DOI:10.1021/ic9010967
日期:2009.8.17
Heteroligand molecular "stirrups" form by the self-assembly of flexible ditopic ligands in combination with 4,4'-bipyridine and [(dppp)Pd)](2+). Crystallographic analysis shows that the ligands, bis[3-(4-pyridyl)pyrazolyl]-m-xylene (mXy(4py3pz)) and bis[4-(4-pyridyl)pyrazolyl]-p-xylene (pXy(4py4pz)) form complexes of the type [(dppp)Pd}(2)(4.4'-bipy)(L)]center dot 4OTf (1 center dot 4OTf and 2 center dot 4OTf, respectively) in the solid state, with remarkably similar structures considering the differences in substitution patterns between the two ligands. The self-assembly of both 1(4+) and 2(4+) is assisted by face-to-face pi interactions on the exterior of the macrocycle between the phenyl rings of the dppp ligands and the pyridyl groups of the ditopic ligands.