4-(1-Allyl-4,5-diphenyl-1H-imidazol-2-yl)-N,N-dimethyl­aniline

The title compound, C₂₆H₂₅N₃, crystallizes with four independent mol­ecules, 1–4, in the asymmetric unit of the triclinic unit cell. The allyl substituents on the imidazole rings adopt similar conformations in all four mol­ecules. The imadazole and the 4-and 5-substituted phenyl rings of two pairs of molecules in the asymmetric unit stack parallel to (110). In contrast, the dimethyl­aniline systems in these pairs of mol­ecules are almost normal to one another, with dihedral angles of 85.84 (10) and 85.65 (10)° between the benzene rings of the two dimethyl­aniline fragments of mol­ecules 1 and 2, and 3 and 4, respectively. The crystal structure features an extensive series of C—H...π inter­actions that link the mol­ecules into undulating rows along the c axis. The crystal studied was a pseudo-merohedral twin with twin law [-100, 0-10, 111] and the BASF parameter refined to 0.513 (3).

(Z)-1-(2-Hy­droxy­eth­yl)-4-(2-meth­oxy­benzyl­idene)-2-methyl-1H-imidazol-5(4H)-one

In the title compound, C₁₄H₁₆N₂O₃, an analog of the chromophore in green fluorescent protein, the meth­oxy­phenyl substituent and the imidazole N adopt a Z conformation with respect to the C=C bond. Aside from the hy­droxy­ethyl group, the mol­ecule is approximately planar, with the five- and six-membered ring planes forming a dihedral angle of 9.3 (1)°. An intra­molecular C—H...N contact occurs. In the crystal, O—H...N hydrogen bonds link the mol­ecules, forming chains along the b-axis direction. C—H...O hydrogen bonds are also observed.

Bis(1,2,3-benzotriazolium) sulfate dihydrate

In the asymmetric unit of the title hydrated salt, 2C₆H₆N₃⁺·SO₄²⁻·2H₂O, there are two independent sulfate ions, one lying on a twofold axis, and the other in a general position. There are three independent benzotriazolium cations and three independent water mol­ecules. The sulfate ion in a general position forms hydrogen-bonded chains of stoichiometry SO₄²⁻·3H₂O in the b-axis direction. The sulfate on the twofold axis is unhydrated and accepts hydrogen bonds from four surrounding benzotriazoles. The benzotriazolium cations form two types of stacks along b. One stack contains only one type of independent cation, related by inversion centers. The other stack contains two alternating independent cations and no symmetry. The two types of stacks have orientations which are rotated by about 79° in the ac plane. 12 symmetrically distinct hydrogen bonds of type N—H...O(sulfate), N—H...O(water), O—H...O(sulfate) and O—H...O(water), with donor–acceptor distances in the range 2.5490 (13)–2.7871 (12) Å, form a three-dimensional array.