335 research outputs found


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    The conformation of the N—H bond in the title compound (23DCPCA), C8H6Cl3NO, is syn to both the 2- and 3-chloro substituents in the aromatic ring, similar to the 2-chloro substituent in 2-chloro-N-(2-chloro­phen­yl)acetamide (2CPCA), the 2- and 3-chloro substituents in N-(2,3-dichloro­phen­yl)acetamide (23DCPA) and in 2,2-dichloro-N-(2,3-dichloro­phen­yl)acetamide (23DCPDCA). The bond parameters in 23DCPCA are similar to those in 2-chloro-N-(phen­yl)acetamide, 2CPCA, 23DCPA, 23DCPDCA and other acetanilides. The mol­ecules in 23DCPCA are linked into chains through N—H⋯O hydrogen bonding

    Crystal Structures and Phase Transitions of 3-Chloro-2,2-bis(chloromethyl)propionic Acid-1 and 1,3-Dichloro-2,2-dimethylpropane

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    The crystal structure of 3-chloro-2,2-bis(chloromethyl)propionic acid-1 was determined from single crystal data. The compound crystallizes in the acentric monoclinic space group P21. Lattice constants at T = 304 K are a = 6.961(1) Å, b = 9.979(2) Å, c = 12.0569(3) Å, b = 94.01(2)°. Structure refinement on 1736 independent reflections yielded R = 0.041. Two molecules are interconnected by hydrogen bridges to form dimers. Thermal analysis and temperature dependent X-ray and IR-measurements gave no indication of a phase transition in the range 150 K < T < 384 K. An order-disorder phase transition was detected for 1,3-dichloro-2,2-dimethylpropane at TI&#x2192;II = 194.3 K, with a plastic cubic phase in the range 194.3 K < T < 259.1 K. The lattice constant in space group Fm3m is a = 9.24 Å at 220 K with a thermal expansion coefficient a(200 K) = 2.6769 x 10–4 K–1. The entropy at the melting point Tm = 259.1 K and at the solid-solid phase transition TI&#x2192;II = 194.3 K is rather low giving strong evidence of a plastic phase. Powder X-ray diffraction pattern in the ordered phase at T = 160 K gave indication of monoclinic symmetry with a = 12.27 Å, b = 10.86 Å, c = 10.68 Å, b = 111.8°. Temperature dependent infrared measurements revealed the conformation of the molecule


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    In the crystal of the title compound, C6H6ClNO2S, N—H⋯O hydrogen bonds pack the mol­ecules into sheets parallel to the ac plane


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    In the crystal structure of the title compound, C14H13Cl2NO2S, the conformation of the N—C bond in the C—SO2—NH—C segment has gauche torsions with respect to the S=O bonds. The mol­ecule is bent at the N atom, with an C—SO2—NH—C torsion angle of −54.9 (3)°. The two benzene rings are tilted relative to each other by 82.3 (2)°. The mol­ecules are linked into centrosymmetric R 2 2(8) motifs by N—H⋯O hydrogen bonds and C—H⋯π inter­actions along [100]

    N-(4-Chloro­phen­yl)succinamic acid

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    In the title compound, C10H10ClNO3, the conformation of the amide O atom and the carbonyl O atom of the acid segment are anti to each other and further, they are anti to the H atoms of their adjacent –CH2 groups. The C=O and O—H bonds of the acid group are in the syn position relative to each other. In the crystal, mol­ecules are packed into infinite chains through inter­molecular N—H⋯O and O—H⋯O hydrogen bonds


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    The crystal structure of the title compound, C8H5Br3ClNO, shows both intra­molecular N—H⋯Br and inter­molecular N—H⋯O hydrogen bonding. In the crystal, the mol­ecules are packed into column-like chains in the c-axis direction via the N—H⋯O hydrogen bonds