Iclaprim mesylate displaying a hydrogen-bonded mol-ecular tape.

The title compound, 2,6-di-amino-5-[(2-cyclo-propyl-7,8-dimeth-oxy--1-benzo-pyran-5-yl)meth-yl]pyrimidin-1-ium methane-sulfonate, CHNO ·CHOS, is a salt made up from a protonated iclaprim mol-ecule and a mesylate anion. The pyrimidine and chromene units of the iclaprim mol-ecule form an orthogonal arrangement [inter-planar angle of 89.67 (6)°], and the 3-nitro-gen position of the pyrimidine ring is protonated.

Crystal structure, PIXEL calculations of inter-molecular inter-action energies and solid-state characterization of the herbicide isoxaflutole.

In the isoxaflutole mol-ecule {systematic name: (5-cyclo-propyl-1,2-oxazol-4-yl)[2-(methyl-sulfon-yl)-4-(tri-fluoro-meth-yl)phen-yl]methanone; CHFNOS}, the 1,2-oxazole and methanone fragments form an almost coplanar unit, whereas the methanone and phenyl mean planes are inclined by an angle of more than 60°. This conformation differs fundamentally from all other known examples of the 1,2-oxazol-4-yl(phen-yl)methanone fragment and is ascribed to the presence of the bulky methyl-sulfonyl substituent at the phenyl ring. PIXEL calculations reveal that the largest contributions to the stabilization of the crystal persist within a columnar arrangement of mol-ecules along the twofold screw axis and in inter-actions between adjacent columns related by an inversion operation.

A Fluoroponytailed NHC-Silver Complex Formed from Vinylimidazolium/AgNO under Aqueous-Ammoniacal Conditions.

3-(1,1,2,2-Perfluorooctyl)-1-vinylimidazolium chloride [2126844-17-3], a strong fluorosurfactant with remarkably high solubility in water, was expediently converted into the respective doubly NHC-complexed silver salt with nitrate as counter ion in quantitative yield. Due to its vinyl substituents, [bis(3-(1,1,2,2-perfluorooctyl)-1-vinylimidazol-2-ylidene)silver(I)] nitrate, , represents a polymerizable -heterocyclic carbene transfer reagent, thus potentially offering simple and robust access to coordination polymers with crosslinking metal bridges. The compound was characterized by infrared and NMR spectroscopy, mass spectrometry as well as elemental analysis, and supplemented by X-ray single-crystal structure determination.

The Eight Hydrates of Strychnine Sulfate.

Commercial samples of strychnine sulfate were used as the starting material in crystallization experiments accompanied by stability studies. Eight hydrate forms (-), including five novel hydrates, were verified. The crystal structures of ("pentahydrate") and ("hexahydrate") were determined from single-crystal X-ray diffraction data.