نتایج جستجو برای: polymorph

تعداد نتایج: 2081  

2010
Nikolay A. Tumanov Evgenia V. Timakova Elena V. Boldyreva

A new polymorph (β) was obtained for an active pharmaceutical ingredient, bis-muth tribenzoate, [Bi(C(6)H(5)CO(2))(3)]. The new β-polymorph is 1.05 times denser than the previously known polymorph [Rae et al. (1998 ▶). Acta Cryst. B54, 438-442]. In the β-polymorph, the Bi atom is linked with three benzoate anions, each of them acting as a bidentate ligand, and these assemblies with C(3) point s...

2015
Mingquan Tong Daliang Zhang Weibin Fan Jun Xu Liangkui Zhu Wen Guo Wenfu Yan Jihong Yu Shilun Qiu Jianguo Wang Feng Deng Ruren Xu

Chiral zeolitic materials with intrinsically chiral frameworks are highly desired because they can combine both shape selectivity and enantioselectivity. In the field of zeolite, the synthesis of chiral polymorph A of zeolite Beta or chiral polymorph A-enriched zeolite Beta is one of the biggest challenges. We demonstrate here a generalized extremely concentrated fluoride route for the synthesi...

Journal: :Clinical cancer research : an official journal of the American Association for Cancer Research 2015
Ren-Yuan Bai Verena Staedtke Teresia Wanjiku Michelle A Rudek Avadhut Joshi Gary L Gallia Gregory J Riggins

PURPOSE Mebendazole (MBZ), first used as an antiparasitic drug, shows preclinical efficacy in models of glioblastoma and medulloblastoma. Three different mebendazole polymorphs (A, B, and C) exist, and a detailed assessment of the brain penetration, pharmacokinetics, and antitumor properties of each individual mebendazole polymorph is necessary to improve mebendazole-based brain cancer therapy....

Journal: :Journal of lipid research 2006
Ravi Kanth Kamlekar Musti J Swamy

The molecular structure, packing properties, and intermolecular interactions of two structural polymorphs of N-palmitoylethanolamine (NPEA) have been determined by single-crystal X-ray diffraction. Polymorphs alpha and beta crystallized in monoclinic space group P2(1)/c and orthorhombic space group Pbca, respectively. In both polymorphs, NPEA molecules are organized in a tail-to-tail manner, re...

2013
Tomislav Balić Berislav Marković Ivana Balić

The title compound, C18H18O4, is a triclinic polymorph of the previously reported monoclinic polymorph [Han & Zhen (2005 ▶). Acta Cryst. E61, o4358-o4359]. In the crystal of the triclinic polymorph, molecules are linked by two pairs of C-H⋯O hydrogen bonds, forming a two-dimensional network parallel to (102), and enclosing loops with graph set motifs of R2(2)(8) and R2(2)(6).

Journal: :Acta crystallographica. Section C, Crystal structure communications 2005
George Ferguson Christopher Glidewell John N Low Janet M S Skakle James L Wardell

Three of the nine isomeric N-(nitrobenzylidene)iodoanilines, C13H9IN2O2, have been found, when crystallized from acetone, to yield polymorphs which differ from those obtained upon crystallization from ethanol. In the second polymorph of 2-iodo-N-(2-nitrobenzylidene)aniline, the molecules are disordered across inversion centres in space group C2/c, but there are no direction-specific interaction...

Journal: :Chemical communications 2006
Graeme M Day Andrew V Trask W D Samuel Motherwell William Jones

The unexpected appearance of a new polymorph of maleic acid is reported and a computational study addresses the predictability of this new polymorph and future potential polymorphism.

2015
Ren-Yuan Bai Verena Staedtke Teresia Wanjiku Michelle A. Rudek Avadhut Joshi Gary L. Gallia Gregory J. Riggins

Purpose: Mebendazole (MBZ), first used as an antiparasitic drug, shows preclinical efficacy in models of glioblastoma and medulloblastoma. Three different mebendazole polymorphs (A, B, andC) exist, and a detailed assessment of the brain penetration, pharmacokinetics, and antitumor properties of each individual mebendazole polymorph is necessary to improve mebendazolebased brain cancer therapy. ...

Journal: :Acta crystallographica. Section B, Structural science 2005
Janet M S Skakle John N Low James L Wardell Christopher Glidewell

The title compound, C(18)H(17)NO(4), crystallizes from ethanol at ambient temperature as two concomitant polymorphs (I) and (II), both monoclinic P2(1)/c with Z' = 1. The less abundant form (I) undergoes a reversible phase-transition at ca 173 K to a third monoclinic polymorph (III), P2(1)/n, with Z' = 2, while the more abundant polymorph (II) is unchanged down to 120 K. In each polymorph of (I...

Journal: :Acta crystallographica. Section C, Crystal structure communications 2005
Jaime Mera Jairo Quiroga Justo Cobo John N Low Christopher Glidewell

A second, monoclinic, polymorph of the title compound, C19H19N3O, is reported. In this polymorph, the molecules are linked into chains by paired C-H...pi hydrogen bonds and the chains are linked into sheets by pi stacking interactions.

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