Synthesis and structure of an unusual complex formed between 1,2-bis(3?-pyridyl)ethyne and C-methyl calixresorcinarene
The X-ray crystal structure of the complex formed between 1,2-bis(3'-pyridyl)ethyne and C-methylresorcinarene is described. The structure (C45H47N3O12) is monoclinic with a = 11.8086(7), b = 31.2037(17), c = 11.2933(6) Å, β = 101.9330(10)° and space group P21/c. The structure reveals that the resorcinarene adopts the common bowl-shaped conformation however the four intramolecular hydrogen bonds are arranged asymmetrically. One of the pyridyl rings sits inside the resorcinarene and is hydrogen bonded to two adjacent resorcinarenes.
Georgiev, Ivan, Eric Bosch, and Charles L. Barnes. "Synthesis and structure of an unusual complex formed between 1, 2-bis (3′-pyridyl) ethyne and C-methyl calix  resorcinarene." Journal of Chemical Crystallography 34, no. 12 (2004): 859-864.
Journal of Chemical Crystallography