4-Substituted and 4,5-Disubstituted 3,6-Di(2-pyridyl)pyridazines: Ligands for Supramolecular Assemblies
作者:Edwin C. Constable、Catherine E. Housecroft、Markus Neuburger、Sébastien Reymann、Silvia Schaffner
DOI:10.1002/ejoc.200701114
日期:2008.3
The syntheses by inverse electron demand Diels-Alder reactions and characterization of 28 members of a family of 3,6-di(2-pyridyl)pyridazines, functionalized in the 4- or 4,5-positions are reported. Single crystal structural data are presented for four representative derivatives.
Pyridazines in Crystal Engineering. A Systematic Evaluation of the Role of Isomerism and Steric Factors in Determining Crystal Packing and Nano/Microcrystal Morphologies
作者:Sunil Varughese、Sylvia M. Draper
DOI:10.1021/cg9015383
日期:2010.6.2
The present study focuses on understanding hydrogen bond patterns in a series of variably substituted pyridyl-pyridazines as a function of positional isomerism and steric factors. A relatively uncommon multiple hydrogen bond acceptor nature of pyridazine has been observed in the di- and tripyridazinc compounds. With increasing aromatic substitution and thereby steric hindrance, a systematic transition has been observed from close-packed to porous solvated assemblies. Distinct morphologies of the organic nano/microparticles, obtained by the precipitation method, indicate that the molecules interact with the solvent system in different ways.