Effect of Ni<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mtext>2+</mml:mtext></mml:math> Doping on the Growth and Properties of Mn-L-Histidine Hydrochloride Monohydrate Crystals (2013)

The main focus of this work had been to grow good quality crystals from amino acids and amino acid-based materials for nonlinear optics (NLO) applications. For the first time, a series of amino acid complexes doped with transition metal ions were grown in our laboratory from aqueous solutions by slow evaporation technique. Ni(II) ion doped Manganese L-Histidine hydrochloride monohydrate (Ni(II)-MnLHICl) crystals were grown on the same lines and were characterized by powder X-ray diffraction (XRD), optical absorption, electron paramagnetic resonance, and infrared absorption studies. From Powder XRD, the unit cell lattice parameters were calculated as <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:mi>a</mml:mi><mml:mo>=</mml:mo><mml:mn>1.5301</mml:mn></mml:mrow></mml:math> nm, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M3"><mml:mrow><mml:mi>b</mml:mi><mml:mo>=</mml:mo><mml:mn>0.8928</mml:mn></mml:mrow></mml:math> nm and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M4"><mml:mrow><mml:mi>c</mml:mi><mml:mo>=</mml:mo><mml:mn>0.6851</mml:mn></mml:mrow></mml:math> nm. From electron paramagnetic resonance (EPR) spectra, isotropic “ g ” factor and spin hamiltonian parameter A all were calculated as 2.0439 and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M5"><mml:mrow><mml:mn>20</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mrow><mml:mn>10</mml:mn></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>, respectively. From optical absorption studies, crystal field splitting value (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M6"><mml:mrow><mml:msub><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>q</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>) and the interelectron repulsion parameters B and C were calculated for Ni 2+ and Mn 2+ as <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M7"><mml:msub><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>q</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>850</mml:mn></mml:math> cm −1 , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M8"><mml:mrow><mml:mi>B</mml:mi><mml:mo>=</mml:mo><mml:mn>725</mml:mn></mml:mrow></mml:math> cm −1 , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M9"><mml:mrow><mml:mi>C</mml:mi><mml:mo>=</mml:mo><mml:mn>2640</mml:mn></mml:mrow></mml:math> cm −1 and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M10"><mml:msub><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>q</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>915</mml:mn></mml:math> cm −1 , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M11"><mml:mrow><mml:mi>B</mml:mi><mml:mo>=</mml:mo><mml:mn>810</mml:mn></mml:mrow></mml:math> cm −1 , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M12"><mml:mrow><mml:mi>C</mml:mi><mml:mo>=</mml:mo><mml:mn>2780</mml:mn></mml:mrow></mml:math> cm −1 , respectively. The presence of various functional groups and the modes of vibrations were confirmed by FTIR studies.