منابع مشابه
N,N′-Bis(3-chlorophenyl)malonamide
The asymmetric unit of the title compound, C(15)H(12)Cl(2)N(2)O(2), contains two independent mol-ecules. In both independent mol-ecules, the N-H bond in one of the amide fragments is anti to the meta-chloro group of the adjacent benzene ring and that in the other amide group is syn to the other meta-chloro group. Furthermore, in both mol-ecules, each amide group is almost coplanar with the adja...
متن کاملA polymorph of terephthalaldehyde
A new ortho-rhom-bic polymorph of terephthalaldehyde, C(8)H(6)O(2), with a melting point of 372 K, has been obtained by recrystallization from ethanol. At room temperature, the crystals transform into the well known monoclinic form, with a melting point of 389 K. The crystal structure of the monoclinic form involves C-H⋯O hydrogen bonds, but no such bonds are observed in the orthorhombic form. ...
متن کاملA polymorph of 2,4-dinitrophenylhydrazine
The crystal structure of a previously unreported polymorph (form II) of 2,4-dinitro-phenyl-hydrazine (DNPH), C6H6N4O4, was determined at 90 K. The first polymorph (form I) is described in the monoclinic space group P21/c [Okabe et al. (1993 ▶). Acta Cryst. C49, 1678-1680; Wardell et al. (2006 ▶). Acta Cryst. C62, o318-320], whereas form II is in the monoclinic space group Cc. The mol-ecular str...
متن کاملA polymorph of tetraethylammonium chloride
The structure of the title compound, C(8)H(20)N(+)·Cl(-), is compared with a polymorph that was described earlier in the same space group. Differences in the conformations of the ethyl groups of the cation exist between the polymorphs. This study is given here in order to provide additional unit-cell data for use in qualitative identification of crystalline samples obtained in syntheses in whic...
متن کاملDiosgenone: a second P21 polymorph
Diosgenone [(20S,22R,25R)-spirost-4-en-3-one, C(27)H(40)O(3)] has been proposed as a new therapeutic alternative for the treatment of malaria. The first X-ray structure report for diosgenone was by Piro et al. [(2002). Z. Naturforsch. Teil C, 57, 947-950] in the space group P2(1) (Z' = 2). We now report a new polymorph in the same space group, with two mol-ecules in the asymmetric unit. Both mo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Crystallographica Section E Structure Reports Online
سال: 2005
ISSN: 1600-5368
DOI: 10.1107/s1600536805030539