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Triclinic polymorph of 4-[4-(4-formyl-phen-oxy)but-oxy]benzaldehyde.

ABSTRACT: 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).

SUBMITTER: Balic T

PROVIDER: S-EPMC3588312 | biostudies-literature | 2013 Jan

REPOSITORIES: biostudies-literature

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2-[4-(2-Formyl-phen-oxy)-but-oxy]-benzaldehyde.

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Project description:IN THE TITLE COMPOUND [SYSTEMATIC NAME: 3,3'-dimethoxy-2,2'-(ethane-1,2-diyldioxy)dibenzaldehyde], C(18)H(18)O(6), prepared from 1,2-dibromo-ethane and ortho-vanillin in the presence of sodium carbonate, the two vanillin units are linked via a CH(2)-CH(2) bridge. The two benzene rings are inclined at a dihedral angle of 41.6 (5)°.

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Project description:The title compound, poly[bis-(?(3)-4-acetamido-propane-sulfon-ato)-calcium], [Ca(C(5)H(10)NO(4)S)(2)](n), is a triclinic polymorph of the previously reported monoclinic structure [Toffoli et al. (1988 ?). Acta Cryst. C44, 1493-1494]. The triclinic modification was found to have an all-trans configuration of the acetamido-propane chain, in contrast with the monoclinic polymorph which shows an angle of 74.66?(8)° between the S-C-C-C chain plane and that of the amide group. The Ca(2+) cation is situated on an inversion centre and is hexa-coordinated by six O atoms belonging to different anions in a distorted octa-hedral geometry. This arrangement leads to a layered structure parallel to (011). The layers are held together by N-H?O hydrogen bonds and by short C-H?O inter-actions, both involving the sulfonate O atoms not coordinated to the Ca(2+) cations. The structure was determined from a crystal twinned by non-merohedry [twin law ([Formula: see text]00, 0[Formula: see text]0, -0.335 -0.85 1), with a fractional contribution of the minor twin domain of 46.7?(1)%].

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