Polymorphism and solvates of flecainide base.

Abstract:

:Flecainide base is pharmaceutically active substance used for production of flecainide acetate which is known in market as Tambacor, Almarytm, Apocard, Ecrinal or Flecaine. It is determined that flecainide base forms four polymorphic forms abbreviated as Ib, IIb, IIIb and IVb. Flecainide base form Ib is thermodynamically stable form at laboratory temperature while form IIIb is stable at higher temperatures. Flecainide form Ib absorbs water in its structure between layers and forms non-stoichiometric hydrate. Flecainide base binds with organic solvents and form monosolvates. Flecainide base form Ib crystallizes in orthorhombic crystals with lattice parameters a = 27.88 Å, b = 13.78 Å, c = 9.98 Å and two independent molecules in unit cell (Z' = 2; Z = 8). Molecule arrangement in flecainide base form Ib structure is not dense and it forms a channel-type structure, where molecules of water and alcohols are placed.

journal_name

Pharm Dev Technol

authors

Veldre K,Eglīte Z,Actiņš A,Zvirgzdiņš A,Rozenberga L,Tamanis E

doi

10.3109/10837450.2013.763259

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

116-24

issue

1

eissn

1083-7450

issn

1097-9867

journal_volume

19

pub_type

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