(E)-2-[4-(Di-ethyl-amino)-styr-yl]-1-methyl-quinolin-1-ium 4-chloro-benzene-sulfonate monohydrate.

The asymmetric unit of the title hydrated salt, C22H25N2 (+)·C6H4ClO3S(-)·H2O, comprises two 2-[4-(di-ethyl-amino)-styr-yl]-1-methyl-quinolin-1-ium cations, two 4-chloro-benzene-sul-fon-ate anions and two solvent water mol-ecules. One ethyl group of both cations displays disorder over two positions in a 0.659 (2):0.

(E)-2-[(2,4,6-Tri-meth-oxy-benzyl-idene)amino]-phenol.

There are two independent mol-ecules in the asymmetric unit of the title compound, C16H17NO4, with similar conformations but some differences in their bond angles. Each mol-ecule adopts a trans configuration with respect to the methyl-idene C=N bond and is twisted with a dihedral angle between the two substituted benzene rings of 80.52 (7)° in one mol-ecule and 83.

(E)-2-[4-(Di-ethyl-amino)-styr-yl]-1-methyl-quinolinium 4-fluoro-benzene-sulfonate monohydrate.

In the title hydrated molecular salt, C22H25N2 (+)·C6H4FO3S(-)·H2O, the cation displays whole mol-ecule disorder over two sets of sites in a 0.780 (5):0.220 (5) ratio.

4-[(E)-(4-Eth-oxy-benzyl-idene)amino]-phenol.

The mol-ecule of the title compound, C15H15NO2, adopts a trans conformation with respect to the methyl-idene C=N bond and is twisted with a dihedral angle of 26.31 (5)° between the two substituted benzene rings. The eth-oxy group is almost coplanar with the bound benzene ring with a C-O-C-C torsion angle of -179.

(E)-2-[4-(Diethyl-amino)-styr-yl]-1-ethyl-pyridinium iodide monohydrate.

In the title hydrated salt, C19H25N2(+)·I(-)·H2O, the 4-(diethyl-amino)-phenyl unit of the cation is disordered over two positions in a 0.847 (3):0.153 (3) ratio.

(E)-2-[4-(Diethyl-amino)-styr-yl]-1-methyl-pyridinium 4-meth-oxy-benzene-sulfonate monohydrate.

In the cation of the title compound, C(18)H(23)N(2) (+)·C(7)H(7)O(4)S(-)·H(2)O, one ethyl group of the diethyl-amino unit is disordered over two sets of sites in a 0.665 (6):0.335 (6) ratio.

(E)-2-[4-(Diethyl-amino)-styr-yl]-1-methyl-pyridinium 4-chloro-benzene-sulfonate monohydrate.

In the title hydrated mol-ecular salt, C(18)H(23)N(2) (+)·C(6)H(4)ClO(3)S(-)·H(2)O, which shows moderate biological activity against methicillin-resistant Staphylococcus aureus (MRSA), one ethyl group of the 2-[4-(diethyl-amino)-styr-yl]-1-methyl-pyridinium cation is disordered over two orientations in a 0.604 (13):0.396 (13) ratio.

(E)-2-[4-(Diethyl-amino)-styr-yl]-1-methyl-pyridinium benzene-sulfonate mono-hydrate.

The asymmetric unit of the title compound, C(18)H(23)N(2) (+)·C(6)H(5)O(3)S(-)·H(2)O, comprises a 2-[4-(diethyl-amino)-styr-yl]-1-methyl-pyridinium cation, a benzene-sulfonate anion and a solvent water mol-ecule. One ethyl substituent of the diethyl-amino group of the cation is disordered over two positions in a 0.73789 (9):0.

2-[(E)-4-(Diethyl-amino)-styr-yl]-1-methyl-pyridinium iodide.

In the title compound, C(18)H(23)N(2) (+)·I(-), the cation exists in the E configuration with respect to the ethenyl C=C bond. The pyridinium and benzene rings are nearly coplanar, making a dihedral angle of 4.63 (7)°.