Lu, Jinzhen published the artcileHeteroligand Molecular “Stirrups” Using Conformationally Flexible Ditopic Pyridyl-Pyrazolyl Ligands, Category: pyrazoles-derivatives, the publication is Inorganic Chemistry (2009), 48(16), 7525-7527, database is CAplus and MEDLINE.
Heteroligand mol. stirrups form by the self-assembly of flexible ditopic ligands in combination with 4,4′-bipyridine and [(dppp)Pd]2+ [dppp = 1,3-bis(diphenylphosphino)propane]. Crystallog. anal. shows that the ligands, bis[3-(4-pyridyl)pyrazolyl]-m-xylene (mXy4py3pz) and bis[4-(4-pyridyl)pyrazolyl]-p-xylene (pXy4py4pz) form [{(dppp)Pd}2(4,4′-bipy)(L)](OTf)4 (1·4OTf and 2·4OTf, resp.) in the solid state, with remarkably similar structures considering the differences in substitution patterns between the two ligands. The self-assembly of both 14+ and 24+ is assisted by face-to-face π interactions on the exterior of the macrocycle between the Ph rings of the dppp ligands and the pyridyl groups of the ditopic ligands.
Inorganic Chemistry published new progress about 19959-71-8. 19959-71-8 belongs to pyrazoles-derivatives, auxiliary class Pyrazole,Pyridine, name is 4-(1H-Pyrazol-4-yl)pyridine, and the molecular formula is C8H7N3, Category: pyrazoles-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics