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2-(2,3,5,6-Tetra-fluoro-4-iodo-anilino)-ethanol.

ABSTRACT: The reaction of 2-amino-ethanol and iodo-penta-fluoro-benzene in the presence of K(2)CO(3) gave the title compound, C(8)H(6)F(4)INO, in high yield. The structure is characterized by double layers of mol-ecules linked by O-H?O and N-H?O hydrogen bonds, and linear C-I?F [I?F = 3.049?(2)?Å] and bent C-I?I [I?I = 3.9388?(7)?Å] inter-actions between pairs of nearly parallel iodo-tetra-fluoro-phenyl groups. No O?I or N?I halogen bonding is found.

SUBMITTER: Metrangolo P

PROVIDER: S-EPMC2915272 | biostudies-literature | 2007 Dec

REPOSITORIES: biostudies-literature

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2-(2,3,5,6-Tetra-fluoro-4-iodo-anilino)-ethanol.

Metrangolo Pierangelo P Meyer Franck F Pilati Tullio T Resnati Giuseppe G

Acta crystallographica. Section E, Structure reports online 20071206 Pt 1

The reaction of 2-amino-ethanol and iodo-penta-fluoro-benzene in the presence of K(2)CO(3) gave the title compound, C(8)H(6)F(4)INO, in high yield. The structure is characterized by double layers of mol-ecules linked by O-H⋯O and N-H⋯O hydrogen bonds, and linear C-I⋯F [I⋯F = 3.049 (2) Å] and bent C-I⋯I [I⋯I = 3.9388 (7) Å] inter-actions between pairs of nearly parallel iodo-tetra-fluoro-phenyl groups. No O⋯I or N⋯I halogen bonding is found. ...[more]

PMID: 21200777

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1,3-Bis(2,3,5,6-tetra-fluoro-4-iodo-phen-oxy)-2,2-bis-[(2,3,5,6-tetra-fluoro-4-iodo-phen-oxy)meth-yl]propane.

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2,3,5,6-Tetra-fluoro-1,4-bis-(2-pyridylmethyl-eneamino-meth-yl)benzene.

Project description:The title compound, C(20)H(14)F(4)N(4), is a flexible bis-pyridine-type ligand with an extended fluorinated spacer group between the two pyridyl functions. The centroid of the central aromatic ring is situated on a crystallographic center of inversion. The dihedral angle between the pyridine ring and the central benzene ring is 63.85?(9)°. The crystal structure exhibits inter-molecular C-H?F hydrogen-bonding inter-actions.

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Crystal structure of 4'-bromo-2,3,5,6-tetra-fluoro-biphenyl-4-carbo-nitrile.

Project description:The title compound, C13H4BrF4N, synthesized from 1,4'-bromo-iodo-benzene and 4-bromo-2,3,5,6-tetra-fluoro-benzo-nitrile in a coupling reaction was found to crystallize in the ortho-rhom-bic space group P212121. The two phenyl rings are rotated with respect to each other by 40.6 (6)°. The mol-ecules inter-act via aryl-perfluoroaryl stacking [3.796 (2) and 3.773 (2) Å], resulting in inter-molecular chains along the a-axis direction. C-H⋯F contacts of about 2.45 Å connect these chains. In contrast to the structure of the parent compound 4'-bromo-biphenyl-4-carbo-nitrile, CN⋯Br contacts that could have given rise to a linear arrangement of the biphenyl mol-ecules desirable for non-linear optical (NLO) materials are not observed in the packing. Instead, several Br⋯F [3.2405 (17) and 3.2777 (18) Å] and F⋯F [2.894 (2) Å] contacts of side-on type II form an inter-molecular network of zigzag chains. The crystal studied was refined as an inversion twin.

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Crystal structure of tetra-ethyl-ammonium chloride 3,4,5,6-tetra-fluoro-1,2-di-iodo-benzene.

Project description:Equimolar qu-anti-ties of tetra-ethyl-ammonium chloride (Et4NCl) and 3,4,5,6-tetra-fluoro-1,2-di-iodo-benzene (o-DITFB or o-C6F4I2) have been co-crystallized in a solution of di-chloro-methane yielding a pure halogen-bonded compound, 3,4,5,6-tetra-fluoro-1,2-di-iodo-benzene-tetra-ethyl ammonium chloride (2/1), Et4N(+)·Cl(-)·2C6F4I2, in the form of translucent needles. [(Et4NCl)(o-C6F4I2)2] packs in the C2/c space group. The asymmetric unit includes one mol-ecule of DITFB, one Et4N(+) cation located on a twofold rotation axis, and one chloride anion also located on a twofold rotation symmetry axis. This compound has an inter-esting halogen-bonding environment surrounding the halide. Here, the chloride anion acts as a tetra-dentate halogen bond acceptor and forms a distorted square-pyramidal geometry, with I?Cl(-)?I angles of 80.891?(6) and 78.811?(11)°, where two crystallographically distinct iodine atoms form halogen bonds with the chloride anion. Resulting from that square-pyramidal geometry are short contacts between some of the adjacent F atoms. Along the b axis, the halogen-bonding inter-action results in a polymeric network, producing a sheet in which the two closest chloride ions are 7.8931?(6)?Å apart. The Et4N(+) cation alternates in columns with the halide ion. The expected short contacts (shorter than the sum of their van der Waals radii) are observed for the halogen bonds [3.2191?(2) and 3.2968?(2)?Å], as well as almost linear angles [170.953?(6) and 173.529?(6)°].

| S-EPMC4420113 | biostudies-literature

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