October 21, 2017

ORGANIC CHEMISTRY- I (NATURE OF BONDING AND STEREOCHEMISTRY)- BONDS WEAKER THAN COVALENT- ADDITION COMPOUNDS


ORGANIC CHEMISTRY- I (NATURE OF BONDING AND STEREOCHEMISTRY)- BONDS WEAKER THAN COVALENT- ADDITION COMPOUNDS

Supramolecular chemistry is a highly interdisciplinary field of science covering the chemical, physical, and biological feature of the organised chemical species of greater complexity than molecules themselves, which are held together and organized by means of intermolecular (non-covalent) binding interactions. 

**The energy of these non-covalent interactions is much smaller than 200-400 kJ mol¹ which is typical for covalent chemical bonds. 

**In addition to relatively strong ion-ion electrostatic interactions of ca. 100-350 kJ mol¹ and hydrogen bonding ca. 10-120 kJ mol¹, they include much smaller London dispersion forces, ion-induced dipole and dipole-dipole interactions that are in the range of 5-50 kj mol¹.

**The supramolecular chemistry generally concerns non-covalent bonding interactions.such as ion-ion interactions, ion-dipole interactions, dipole-dipole interactions hydrogen bonding, cation-π interactions, anion-π interactions, π-π interactions, closed shell interactions, van der Waals forces, crystal close packing and closed shell interactions. 

**The term 'non-covalent' encompasses an enormous range of attractive and repulsive effects.

 
ORGANIC CHEMISTRY- I (NATURE OF BONDING AND STEREOCHEMISTRY)- BONDS WEAKER THAN COVALENT- ADDITION COMPOUNDS