The late F.H. Allen from the Cambridge Crystallographic Data Centre (CCDC) has published a great deal on the nature of hydrogen bonds.  You might wish to check the CCDC website or search for papers by F.H. Allen concerning H-bonding to obtain these values.  Also, you can get the program "Mercury" from CCDC and it has default values built in.

Thank you sir

 Dear Rao,

Jeffrey categorizes H bonds with donor-acceptor distances of 2.2-2.5 Å as “strong, mostly covalent”, 2.5-3.2 Å as “moderate, mostly electrostatic”, 3.2-4.0 Å as “weak, electrostatic” (page 12). Energies are given as 40-14, 15-4, and

Sir great and fascinating information. Thank you for your reply

 @Rafik Karaman Thanks for the answer. Can you please suggest a cutoff for angle if the engagement is intermolecular (distance between donar-acceptor > 3 angstrom)

Thanks

Hi, it is better to be precise that you mention which angle exactly.

The standard practice is the cutoff distance 3.5 A and cutoff angle 30 degree.

Rudramani Pokhrel do you have a reference for 3.5 A and 30 degrees for a hydrogen bond? Thanks

What kind of reference do you want? If you are loking for the paper employed same parameter, you can check on of my papers on Mutacin 1140