Determinação da estrutura cristalina/molecular de um derivado da tiossemicarbazona com atividade farmacológica, a tetralona-tiossemicarbazona

The hydrochloric acid catalyzed reaction of 1-tetralone (10 mmol) and thiosemicarbazide (10 mmol) in a 3:1 mixture of ethanol and water (100 ml) was refluxed for 7 h. After cooling and filtering, crystals suitable for X-ray diffraction were obtained by recrystallization from tetrahydrofurane. The mo...

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Bibliographic Details
Main Author: Silva, Cecília Santos
Other Authors: Oliveira, Adriano Bof de
Format: Others
Language:English
Published: Pós-Graduação em Química 2017
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Online Access:https://ri.ufs.br/handle/riufs/6139
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Summary:The hydrochloric acid catalyzed reaction of 1-tetralone (10 mmol) and thiosemicarbazide (10 mmol) in a 3:1 mixture of ethanol and water (100 ml) was refluxed for 7 h. After cooling and filtering, crystals suitable for X-ray diffraction were obtained by recrystallization from tetrahydrofurane. The molecular structure of the tetralone-thiosemicarbazone, C11H13N3S, is not planar: the maximum deviation from the mean plane of the non-H atoms is 0.521 (2) A for an aliphatic C atom, which corresponds to an envelope conformation for the nonaromatic ring. The thiosemicarbazone moiety and the benzene ring have maximum deviations from the mean planes through the non-H atoms of 0.0288 (16) and 0.0124 (27) A, respectively, and the dihedral angle between the two planes is 8.84 (13)o. In the crystal, molecules are linked into chains by pairs of N-H¡E¡E¡ES hydrogen bonds along [1 -1 0], forming a one-dimensional H bonded polymer. The molecule shows an trans conformation for the atoms about the C1¡XN1/N1¡XN2/N2¡XC11 bonds. The cystal data are: space group monoclinic, C 2/c, a = 15.4388 (11) A, b = 5.5781 (3) A, c = 26.338 (2) A e Ò = 102.940 (6)o. Through 1H NMR spectrum was observed that the tautomeric thione form is predominant in solution. All starting materials were commercially available and were used without further purification. The synthesis was adapted from a procedure reported previously. This work is already published (Oliveira et al., Acta Cryst. (2012). E68, o2581). === A reação da 1-tetralona (10 mmol) com a tiossemicarbazida (10mmol) foi feita numa solucao etanol e agua, em proporcao 3:1, respectivamente. A solucao de 100 mL foi refluxada durante 7 h. Apos o resfriamento e filtracao, foram obtidos cristais adequados para a difracao de raios-X em monocristal. A estrutura molecular da tetralona-tiossemicarbazona e inedita, C11H13N3S, e nao e planar: o desvio maximo do plano principal que passa pelos atomos nao hidrogenoides e de 0,521(2) A para um carbono alifatico, o que esta de acordo com a conformacao de envelope do anel nao aromatico. O fragmento tiossemicarzona e o grupo contendo o anel aromatico apresentam desvios maximos do plano ideal atraves dos atomos nao hidrogenoides de 0,0288(16) e 0,0124(27) A, respectivamente e o angulo entre os planos e de 8,84 (13)o. No estado solido, as moleculas estao conectadas por pares de interacoes de hidrogenio centrossimetricas do tipo N-H¡E¡E¡ES na direcao cristalografica [1 -1 0], formando um polimero de ligacoes de hidrogenio unidimensional. Alem disso, a molecula possui uma conformacao trans em relacao as ligacoes quimicas C1¡XN1/N1¡XN2/N2¡XC11. O grupo espacial e monoclinico, C 2/c e as constantes de cela sao a = 15,4388 (11) A, b = 5,5781 (3) A, c = 26,338 (2) A e Ò = 102,940 (6)o. Atraves do espectro de RMN 1H foi observado que a forma tautomerica tiona e predominante em solucao. A sintese ja e conhecida na literatura e todos os edutos utilizados sao disponiveis comercialmente. Foram utilizados sem purificacao ou tratamento previos. Este trabalho ja esta publicado (Oliveira et al., Acta Cryst. (2012). E68, o2581).