FTIR, FT Raman spectra and normal coordinate analysis of hydralazine

Abstract

<span style="mso-bidi-language:HI">Hydralazine (C₈H₈N₄.HCI) is chemically known as 1-hydrazinophthalazine mono hydrochloride. It is used as an antihypertensive agent. In the present investigation, normal coordinate analysis has been carried out for the molecule of the title

<span style="mso-bidi-language:HI">compound using fundamental modes of vibration observed in infrared and Raman spectroscopy. The vibrational modes are classified into <i>A' </i>and <i>A” </i>irreducible representations and are distributed as Г_vib=35 <i>A'+</i>19<i> A” </i>based on C_s, point group

<span style="mso-bidi-language:HI">symmetry associated with the structures. In the present work, only 18 <i>A' </i>and 12 <i>A” </i>normal modes are considered due to complexity of the molecule. A systematic set of orthonormal symmetry co-ordinates has been constructed. Wilson's <span style="mso-bidi-font-family:Arial;mso-bidi-language:HI">F-G

<span style="mso-bidi-language:HI">matrix method has been adopted for the normal coordinate analysis. A satisfactory vibrational band assignment has been made by using the FTIR and FT Raman spectra of the compounds.

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