# Polymorphism in 1-(4-Fluorophenyl)-3,6,6-trimethyl-2-phenyl-1,5,6,7-tetrahydro-4H-indol-4-one: A Subtle Interplay of Weak Intermolecular Interactions

Chopra, Deepak and Nagarajan, K and Row, Tayur Guru N (2005) Polymorphism in 1-(4-Fluorophenyl)-3,6,6-trimethyl-2-phenyl-1,5,6,7-tetrahydro-4H-indol-4-one: A Subtle Interplay of Weak Intermolecular Interactions. In: Crystal Growth & Design, 5 (3). pp. 1035-1039.

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## Abstract

An understanding of structural features associated with polymorphism in an anti-implantation agent has been made in terms of morphology, single-crystal structure, powder X-ray diffraction, and differential scanning calorimetric measurements. Polymorph 1 (P1) crystallizes from a solution in dichloromethane/hexane in monoclinic, noncentro symmetric $P2_1$ (as plates), whereas the second polymorph (P2) crystallizes from a solution in EtOH/ acetone in tetragonal, centro symmetric $P4_2/n$ (as blocks). P1 is stabilized by $C-H\cdot\cdot\cdotO$ and $C-H\cdot\cdot\cdot \pi$ intermolecular interactions forming molecular chains, while P2 is stabilized by $C-H\cdot\cdot\cdotO$ and $C-H\cdot\cdot\cdot \pi$ dimers and a not so common $F\cdot\cdot\cdot F$ intermolecular interaction.

Item Type: Journal Article http://dx.doi.org/10.1021/cg049656k The Copyright belongs to American Chemical Society. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 25 Aug 2008 19 Sep 2010 04:24 http://eprints.iisc.ernet.in/id/eprint/5831