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Original Article

ECB. 2015; 4(8): 393-409


ROLE OF INTERMOLECULAR INTERACTIONS IN LINEAR FURANOCOUMARIN DERIVATIVES

Ahsan Elahi, Rajni Kant.




Abstract

Energy calculations have been performed on a series of ten molecules of linear furanocoumarin derivatives to obtain the total stabilization
energy i.e. lattice energy of the crystal and also the energy of neighbouring molecular pairs participating in the stabilization of the crystal.
The total stabilization energy (lattice energy) lies in the range -16 to -40 kcal mol-1
. Analysis of the energetics of the neighbouring
molecular pairs in these structures shows the presence of different intermolecular interactions participating in the crystal packing. In
addition to the significance of coulombic nature of bifurcated C-H…O hydrogen bonds, the stabilizing role of π…π stacking interactions
has been realized in these structures. A careful observation of energetics of different molecular pairs involving C-H…O hydrogen bond
reveals that motifs involving C(sp2
)-H…O hydrogen bonds are more stabilized than those of C(sp3
)-H…O.

Key words: furanocoumarin, lattice energy, intermolecular interactions, PIXEL.






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