Structural and spectroscopic studies of the adducts of quinuclidine and 3,5-dinitrobenzoic acid

1,4-Diazabicyclo[2.2.2]octanium bis(3,5-dinitrobenzoate) monohydrate

“…The bond lengths and angles within the two symmetry-independent 3,5-dinitrobenzoate anions are comparable and both molecules are nearly planar. The geometric parameters in the 3,5-dinitrobenzoate anion are also comparable with the corresponding values in its adducts with quinuclidine (Chantrapromma, Usman, Fun, Poh & Karalai, 2004).…”

“…Owing to this interest, we have investigated recently the interaction between 3,5-dinitrobenzoic acid with several amine bases such as 2,4 H -bipyridine (Chantrapromma et al, 2002a), quinuclidine (Chantrapromma,Usman, Fun, Poh & Karalai, 2004) and hexamethylenetetramine (Fun et al, 2003;. The proton transfer process occurs in these adducts and the adduct of 3,5-dinitrobenzoic acid with hexamethylenetetramine undergoes a phase transition (Fun et al, 2003).…”

Synthesis, crystallographic, spectral, and spectrophotometric studies of proton transfer complex of 1,2-dimethylimidazole with 3,5-dinitrobenzoic acid in different polar solvents

“…4). These absorption bands of longer wavelength attribute to the complete transfer of charge from DMI to DNBA [39] as shown in Scheme 1. The stoichiometry of the CT complex was determined by applying the straight line method based on modified BenesieHildebrand equation [48].…”

“…The DNBA is a strong organic acid, which readily forms 3,5-dinitrobenzoate anion when cocrystallized with organic imidazole bases by transferring an H atom forming salt-like adducts. These types of adducts have been formed via the nitro and carboxylate groups such as NeH/O and OeH/O interactions (Scheme 1) [39]. On the other hand, we have also selected DMI as a good organic base because it can rapidly form cation facilitates a strong attraction with the benzoate anion of DNBA through intermolecular hydrogen bonding (N þ dH/O À ).…”

Microscopic theory of phase transitions in hydrogen-bonded phenol-amine adducts

“…Owing to our interests in hydrogen bondings in such systems, we have investigated systematically in single crystal forms a class of phenol-amine adducts and their crystal structures were reported. [1][2][3][4][5][6][7][8] Some of these single crystals of phenol amine adducts undergo a reversible phase transition with variation in temperature. For these samples, a hydrogen atom is transferred from the phenol ͑which then becomes an anion͒ to the amine ͑which then becomes a cation͒.…”