The Crystal and Molecular Structure of 3-(Pyridyl-2\u27)- imidazo-[1,i-a] Pyridine

The crystal structure of 3:.(pyridyl-2\u27)-imidazo-[l,5-a] pyridine has been determined using three-dimensional MoK a diffractometer data. The crystal data at 293 (1) K are as follows: C12H0Na, Mr= = 195.23, orthorhombic, P212121 (No. 19), a = 0.5107(1), b = 1.3076(2}, c = 1.4343(3) nm, V = 0.9578 nm3, Dm = 1.37(5), Dx = 1.354 Mg · m-3, Z = 4. The structure has been solved with direct methods and refined by full-matrix least-squares techniques to R and Rw values of 0.085 and 0.080, respectively, for 641 contributing reflexions. The crystal structure consists of discrete molecules. Most of the bond lengths and angles are within normal ranges for aromatic heterocyclic systems. The dihedral angle between the pyridine and imidazo- pyridine parts of the molecule is 3.8°; thus the molecule is planar to within 7 pm owing to two weak C-H .. . N interactions