Effect of halogen bonding interaction on supramolecular assembly of halogen-substituted phenylpyrazinamides
作者:Hamid Reza Khavasi、Alireza Azhdari Tehrani
DOI:10.1039/c3ce40093j
日期:——
A series of halogen-substituted phenylpyrazinamides have been synthesized and crystallographically characterized in order to investigate the effect of halogen bonding interaction on supramolecular assembly of N-phenylpyrazine-2-carboxamide derivatives. The notable feature in crystal structures of meta- and para-iodinated, brominated and chlorinated compounds is that there is a tendency to form a halogen bonding synthon between adjacent halophenyl and prazine/halophenyl rings. Influence of these halogen bonding interactions on supramolecular assemblies have been discussed with the help of geometrical analysis and theoretical calculations. The X⋯N halogen bonding distances are 2.2–7.7% shorter than the sum of the van der Waals radii of the nitrogen and halogen atoms. Also, theoretical methods show the N⋯X halogen bonding energies within a range of −9.43 to −23.67 kJ mol−1. Our studies show that the selection of halogen atom as well as the position of substitution on phenylpyrazinamide compound may be important for crystal design based on halogen bonding.
Influence of Halogen Bonding Interaction on Supramolecular Assembly of Coordination Compounds; Head-to-Tail N···X Synthon Repetitivity
作者:Hamid Reza Khavasi、Alireza Azhdari Tehrani
DOI:10.1021/ic3021113
日期:2013.3.18
the mercury(II) ion through the N atom syn to the carbonyl. Therefore, the second common feature of the crystal structures for complexes studied here is the selectivity of the metal ion coordination site. The halogen bond synthon repetitivity across these compounds and selectivity in the mercury(II) ion coordination site further point to application in the coordination crystal engineering research field