These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Two isomeric pairs of dihydrobenzopyrazoloquinazolines: centrosymmetric dimers, chains and sheets built from C-H...N and C-H...pi(arene) hydrogen bonds and pi-pi stacking interactions.
    Author: Portilla J, Quiroga J, Cobo J, Nogueras M, Low JN, Glidewell C.
    Journal: Acta Crystallogr C; 2005 Jun; 61(Pt 6):o398-403. PubMed ID: 15930696.
    Abstract:
    Molecules of 5-methyl-2-phenyl-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline, C21H17N3, (I), are linked into chains by a combination of a C-H...pi(arene) hydrogen bond and a pi-pi stacking interaction; in the closely related 5-methyl-2-(4-methylphenyl)-6,7-dihydrobenzo[h]pyrazolo[1,5-a]quinazoline, C22H19N3, (II), there are no hydrogen bonds and the molecules are linked into centrosymmetric dimers by a pi-pi stacking interaction. 7-Methyl-10-phenyl-5,6-dihydrobenzo[h]pyrazolo[5,1-b]quinazoline, C21H17N3, (III), is isomeric with (I), and the molecules of (III) are linked into sheets by a combination of C-H...N and C-H...pi(arene) hydrogen bonds. 7-Methyl-10-(4-methylphenyl)-5,6-dihydrobenzo[h]pyrazolo[5,1-b]quinazoline, C22H19N3, (IV), is isomeric with (II), and molecules of (IV) are linked into centrosymmetric dimers by a C-H...pi(arene) hydrogen bond, augmented by pi-pi stacking interactions.
    [Abstract] [Full Text] [Related] [New Search]