Orthorhombic-to-monoclinic temperature-dependent phase transition of hexamethylenetetraminium-3,5-dinitrobenzoate-3,5-dinitrobenzoic acid monohydrate crystal

First Order Temperature Dependent Phase Transition in a Monoclinic Polymorph Crystal of 1,6-Hexanedioic Acid: An Interpretation Based on the Landau Theory Approach

“…Reports on several types of phase transitions due to hydrogen bonding [1,2] and their conformation changes [3] have been published. In our previous investigations, we have reported the studies of hydrogen bonding phase transitions in phenol/benzoic acid and amine adducts [4,5,6,7,8]. In those crystals the structural phase transitions have been from monoclinic-to-triclinic [4] and from orthorhombic-to-monoclinic [7].…”

“…In our previous investigations, we have reported the studies of hydrogen bonding phase transitions in phenol/benzoic acid and amine adducts [4,5,6,7,8]. In those crystals the structural phase transitions have been from monoclinic-to-triclinic [4] and from orthorhombic-to-monoclinic [7]. The phenomenological Landau theory of ferroelastic phase transitions was developed to identify the primary order parameters of these structural phase transitions leading eventually to the clarification of these structural phase transitions [5,6,8].…”

Crystal structure of desvenlafaxinium 3,5-dinitrobenzoate 3,5-dinitrobenzoic acid monohydrate, C30H35N5O15

“…It is aracemic mixture and is reported to exist in four crystalline polymorphs [2].Furthermore the crystal structure of venlafaxine hydrochloride [3], am onoclinic polymorph of venlafaxine hydrochloride [4],venlafaxine itself [5], desvenlafaxine succinate monohydrate [6] and two polytypes of desvenlafaxine succinate monohydrate [7]h aveb eenr eported. Thec rystal structure of at ernary complex,4 -(2-pyridyl)pyridinium-3,5-dinitrobenzoate-3,5-dinitrobenzoic acid (1/1/1), is apparent in the literature [8], and an orthorhombic-to-monoclinic temperature-dependent phase transition of hexa-methylenetetraminium-3,5-dinitrobenzoate-3,5-dinitrobenzoic acid monohydrate in the solid state has been described [9]. In the crystal, amolecule of water is present next to onea dditional molecule of the -n on-dissociated -c arboxylic acid.…”

“…The Hatoms of the methyl groups were allowed to rotate with afixed angle around the C-C bond to best fit the experimental electron density (HFIX 137 [7]h aveb eenr eported. Thec rystal structure of at ernary complex,4 -(2-pyridyl)pyridinium-3,5-dinitrobenzoate-3,5-dinitrobenzoic acid (1/1/1), is apparent in the literature [8], and an orthorhombic-to-monoclinic temperature-dependent phase transition of hexa-methylenetetraminium-3,5-dinitrobenzoate-3,5-dinitrobenzoic acid monohydrate in the solid state has been described [9]. In the crystal, amolecule of water is present next to onea dditional molecule of the -n on-dissociated -c arboxylic acid.…”

4-Aza-1-azoniabicyclo[2.2.2]octane 2,4-dinitrobenzoate

“…Interactions between phenols or organic acids with amine bases in the solid phase are widely used to study hydrogen bonds since the two components are generally linked by intramolecular or intermolecular O-HÁ Á ÁO, O-HÁ Á ÁN or N-HÁ Á Á hydrogen bonds (Desiraju, 1995;Chantrapromma et al, 2006). As part of our ongoing studies of hydrogen-bonded interactions and phase transitions due to hydrogen-bonding (Usman et al, 2001;Fun et al, 2003;How et al, 2005), we have investigated the interaction between 2,4-dinitrobenzoic acid and several amine bases, such as hexamethylenetetraminium (Rosli et al, 2006a) and 2-methylquinolinium (Rosli et al, 2006b).…”