Structure Re-determination of LASSBio-294-a cardioactive compound of the N-acylhydrazone class - using X-ray powder diffraction data

Author(s)

Costa, Fanny N. ; Ferreira, Fabio Furlan ; da Silva, Tiago F. ; Barreiro, Eliezer J. ; Lima, Lidia M. ; Braz, Delson ; Barroso, Regina C.

• Document type: Journal article
• Source: Powder Diffraction; v. 28, p. 19-pg., 2013-09-01.

Abstract

Many N-acylhydrazone derivatives synthetized in LASSBio (R) cannot be prepared as single crystals of sufficient size and/or quality for structure determination to be carried out using single crystal X-ray diffraction techniques. This article highlights the opportunity for determining crystal structures of this class of compounds directly from powder diffraction data. For this task, the crystal structure of LASSBio-294 was re-determined by means of conventional X-ray powder diffraction data and so, compared with the crystal structure already determined for single crystal data. LASSBio-294 is a cardioactive compound of the N-acylhydrazone class, which can become part of the therapeutic interventions designed to decrease exertional fatigue, and, consequently, improve the quality of life of patients suffering from chronic heart failure. Its final crystal structure was refined by means of the Rietveld method (Rietveld, 1967; 1969). This drug crystallizes in a monoclinic (P2(1)/c) space group, with unit cell parameters a = 11.3413(3) angstrom, b = 12.3573(4) angstrom, c = 9.0158(3) angstrom, beta = 89.821(2)degrees, V = 1263.55(7) angstrom(3), Z = 4, Z' = 1 and rho(calc) = 1.4419(1) g cm(-3). The goodness-of-fit indicator and R-factors were, respectively: chi(2) = 1.203, R-Bragg = 0.696%, R-wp = 5.59%, R-exp = 4.65% and R-p = 4.18%. The molecules in LASSBio-294 are H-bonded along the c-axis involving the atoms N(3)-H(8)center dot center dot center dot O(4). (AU)

• FAPESP's process: 08/10537-3 - Study of crystalline pharmaceuticals polymorphs by X-ray powder diffraction and the Rietveld method
• Grantee: Fabio Furlan Ferreira
• Support Opportunities: Research Grants - Young Investigators Grants