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Ortho-rhom-bic modification of bis-[4-(3-pyridyl-methyl-idene-amino)-phen-yl]methane.

ABSTRACT: The title compound, C(25)H(20)N(4), is a disubstituted methane derivative having two pyridyl-methyl-ene-amino-phenyl arms, one of which is essentially rigid as all atoms lie on a plane (r.m.s. deviation = 0.074 Å), whereas the other is twisted [dihedral angle between the phenyl-ene and pyridyl rings = 51.1 (4)°]. The angle at the methyl-ene C atom is 113.2 (2)°.

SUBMITTER: Shah K

PROVIDER: S-EPMC3007987 | biostudies-literature |

REPOSITORIES: biostudies-literature

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An ortho-rhom-bic polymorph of 5-[(4-methyl-phen-yl)diazen-yl]salicylaldehyde.

Project description:The title compound, C(14)H(12)N(2)O(2), is an ortho-rhom-bic polymorph of the previously reported monoclinic form [Bakir et al. (2005 ?). Acta Cryst. E61, o1611-o1613]. The dihedral angle between the aromatic rings is 4.32?(13)°. The mol-ecular structures of the two polymorphs, including short intra-molecular O-H?O hydrogen bonds between the the hydr-oxy and keto groups, are quite similar but their crystal packings are distinct. Unlike the monoclinic form, in which centrosymmetrically related hydr-oxy and keto groups form {?H?O}(2) synthons via weak O-H?O contacts, leading to dimeric aggregates, in the ortho-rhom-bic form, the hydrogen bonding between these groups leads to the formation of supra-molecular chains orientated along the a axis.

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A new ortho-rhom-bic polymorph of 1,1'-seleno-bis-(N,N-diethyl-sulfanecarbothio-amide).

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An ortho-rhom-bic polymorph of 6-de-oxy-6-iodo-1,2:3,4-di-O-isopropyl-idene-?-d-galactopyran-oside.

Project description:The title compound, C(12)H(19)IO(5), is the ortho-rhom-bic polymorph of a previously reported monoclinic form [Krajewski et al. (1987 ?). Bull. Pol. Acad. Sci. Chem.35, 91-102]. The dihedral angles between the six-membered ring and the two five-membered rings are 67.66?(14) and 71.79?(13)°, whereas the dihedral angle between the five-membered rings is 74.41?(12)°, indicating that all three rings are twisted from each other. The six-membered ring has a twist-boat conformation while both of the five-membered rings have envelope conformations. The crystal structure is stabilized by a network of C-H?O contacts linking the mol-ecules into a two-dimensional array parallel to the ab plane.

| S-EPMC2977305 | biostudies-literature

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