Electronic structure and first hyperpolarizability of poly(�?2-L-alanine-�?3-sodium nitrate (I)) crystals

Bulletin of materials science

A Duarte Moller¹ 

[1] Centro de Investigación en Materiales Avanzados, SC, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31109, México$$Universidad Tecnológica de Querétaro, Avenida Pie de la Cuesta 2501, Unidad Nacional, Santiago de Querétaro, 76148, Querétaro de Arteaga, México$$Centro de Investigación en Materiales Avanzados, SC, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31109, MéxicoCentro de Investigación en Materiales Avanzados, SC, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31109, México$$Universidad Tecnológica de Querétaro, Avenida Pie de la Cuesta 2501, Unidad Nacional, Santiago de Querétaro, 76148, Querétaro de Arteaga, México$$Universidad Tecnológica de Querétaro, Avenida Pie de la Cuesta 2501, Unidad Nacional, Santiago de Querétaro, 76148, Querétaro de Arteaga, MéxicoCentro de Investigación en Materiales Avanzados, SC, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31109, México$$Universidad Tecnológica de Querétaro, Avenida Pie de la Cuesta 2501, Unidad Nacional, Santiago de Querétaro, 76148, Querétaro de Arteaga, México$$

关键词: LASN;    NLO;    electronic structure;    DOS;    hyperpolarizability;    alanine.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Poly(ðœ�?₂-L-alanine-ðœ�?₃-sodium nitrate (I)), ð‘�?-LASN, crystals have been grown by slow evaporation at room temperature. The nominal size of the crystals obtained by the method was of 500 nm. The UVâ€�?�Vis spectrum shows a wide range, where absorption is lacking around 532 nm, which is required in order to have the second harmonic emission, when an incident radiation of 1064 nm strikes on the crystal. This guarantees the possible use of the crystal in visible light applications. The transparent nature of the crystal in the visible and infrared regions within the transmission spectrum confirms the nonlinear optical properties of the crystal. Additionally, Fourier transform infrared spectroscopy displays its functional groups which correspond to the poly(ðœ�?₂-L-alanine-ðœ�?₃-sodium nitrate (I)), where the presence of nitrates in the lattice generally can be identified by their characteristic signature within the 1660â€�??1625, 1300â€�??1255, 870â€�??833 and 763â€�??690 cm^-1 range. Single crystal diffraction was carried out in order to determine atomic structure and lattice parameter. Structural parameters were ð‘�? = 5.388(9) Ã�?, ð‘�? = 9.315(15) Ã�? and ð‘�? = 13.63(2) Ã�?. The structure of poly(ðœ�?₂-Lalanine-ðœ�?₃-sodium nitrate (I)) shown by single crystal diffraction shows an asymmetric unit consisting of one sodium and one nitrate ion and one L-alanine molecule. The coordination geometry around the sodium atom was trigonal bipyramidal, with three bidentate nitrate anions coordinating through their oxygen atoms and two L-alanine molecules, each coordinating through one carboxyl oxygen atom. Electronic structure was obtained by using the Beckeâ€�?�Leeâ€�?�Yangâ€�?�Part and Hartreeâ€�?�Fock approximations with hybrid exchangecorrelation three-parameter functional and G-311^**G(ð‘�?�ð�?��?) basis set. Theoretical and experimental results were compared and discussed as having an excellent agreement among them.

【 授权许可】

Unknown