resumo
The asymmetric unit of the title compound, C(9)H(9)Br(3), is composed of a single molecule. Two bromo substituents are located on one side of the plane of the aromatic ring and the third is on the opposite side, with the molecular unit exhibiting an approximate noncrystallographic C(s) point group. The crystal structure is rich in Br center dot center dot center dot Br, CH(2)center dot center dot center dot Br and CH center dot center dot center dot pi weak intermolecular contacts which mediate the crystal packing of individual molecules. These interactions promote a red-shift of a handful of vibrational modes (associated with the pendant -CH(2)Br groups) compared with values from theoretical density functional theory (DFT) calculations.
palavras-chave
POLYMERS
categoria
Chemistry; Crystallography
autores
Fernandes, JA; Vilela, SMF; Ribeiro-Claro, PJA; Paz, FAA
nossos autores
Filipe Alexandre Almeida Paz
Investigador Principal
José Alberto Pires Fernandes
Bolseiro de pós-Doutoramento
Paulo Ribeiro-Claro
Professor Associado com Agregação
Sérgio Manuel Felipe Vilela
Bolseiro de pós-Doutoramentoagradecimentos
The authors are grateful to the Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) for general financial support (R&D project No. PTDC/QUI-QUI/098098/2008), for post-doctoral and PhD research grants (No. SFRH/BPD/63736/2009 to JAF and No. SFRH/BD/66371/2009 to SMFV), and for specific funding towards the purchase of the single-crystal diffractometer.