Among the crystalline forms of water, the familiar hexagonal and the metastable cubic modifications of ice I occur naturally on the Earth and in its atmosphere, while other ices exist only under high pressures. Using molecular-dynamics simulations we have examined the effects of static electric fields upon the freezing of water. A quartzlike ice polymorph has been produced under pressures of 3–...

In the stable polymorph of the title compound, C17H19NO3 [systematic name: (5α,6α)-7,8-didehydro-4,5-ep-oxy-17-methyl-morphinan-3,6-diol], the mol-ecular conformation is in agreement with the characteristics of previously reported morphine forms. The molecule displays the typical T-shape and its piperidine ring adopts a slightly distorted chair conformation. Inter-molecular O-H⋯O hydrogen bonds...

Abstract Metaphosphimates are possible precursors for oxonitridophosphates. A new polymorph of trimetaphosphimic acid, in fact an oxonium trimetaphosphimate monohydrate, crystallizes the monoclinic space group P 2 1 / c . It exhibits coin‐roll‐like stacks H (PO NH) 3 − anions a rectangular pattern, whereas these form hexagonal arrangement known polymorph. Ring conformation analysis reveals stat...

The title salt, C(12)H(24)N(+)·NCS(-), represents a monoclinic polymorph of the previously reported ortho-rhom-bic form [Khawar Rauf et al. (2008 ▶). Acta Cryst. E64, o366]. Two independent formula units comprise the asymmetric unit with the major difference in their mol-ecular structures relating to the relative dispositions of the cyclo-hexyl rings [dihedral angles = 79.88 (6) and 67.72 (5)°]...

The solid solution of general formula Bi4V2−xSix/2Px/2O11−δ (0.0 ≤x≤ 0.5) has been synthesized and characterized by XRD, SEM, FTIR, ATD, Raman spectroscopy Electrochemical Impedance Spectroscopy. present study showed that compounds with x ​≤ ​0.3 are isostructural the monoclinic α polymorph, while compound ​= ​0.4 is crystallize β polymorph. In temperature range from 25 to 700 ​°C, electrical c...