From owner-chemistry@ccl.net Wed Feb 8 05:36:00 2012 From: "DJUKIC Jean-Pierre djukic]![unistra.fr" To: CCL Subject: CCL: How can be separate CH-pi and pi-pi interaction? Message-Id: <-46261-120208053314-17559-NRYsRkm/Ng46QJeBdKGX1w##server.ccl.net> X-Original-From: DJUKIC Jean-Pierre Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=ISO-8859-1; format=flowed Date: Wed, 08 Feb 2012 11:32:45 +0100 MIME-Version: 1.0 Sent to CCL by: DJUKIC Jean-Pierre [djukic^unistra.fr] Dear RAM, The first thing is to define the physical base of the so-called C-H -pi and pi-pi interactions. Once this is done, the rest is easier. Best regards, JPD Le 07/02/2012 19:22, Ram Shankar S ramchemistry2011]=[gmail.com a écrit : > Sent to CCL by: "Ram Shankar S" [ramchemistry2011|gmail.com] > Dear All, > How can we separate CH-pi and pi-pi interaction into strong, moderate and weak based on the bond distance and bond angles (geometrical parameters) in pure organic substances? Whether is there any reference available for this? > > On what basis this kind of interactions (CH-pi and pi-pi) is separated, and I would like to know how this CH-pi and pi-pi interactions can be classified as strong, moderate and weak.Please help me in this regards. > > Thanks in advance > > With Regards, > RAAM> > > --