bonsoir
1. Introduction
The second order nonlinear optical materials have recently
attracted much attention because of their potential applications
in emerging optoelectronic technologies [1,2]. Materials with
large second order optical nonlinearities find wide applications
in the area of laser technology, laser communication and data
storage technology [3,4]. The inorganic materials are widely
used in these applications because of their high melting point,
high mechanical strength and high degree of chemical inertness.
The optical nonlinearity of these materials is poor.Organic compounds
are often formed by weak Van der walls and hydrogen
bonds and posses a high degree of delocalization. Hence, they
are optically more nonlinear than inorganic materials. A major
drawback of crystalline organic NLO materials is the difficulty
in growing large, optical-quality single crystals; also, the often-fragile nature of these crystals makes them difficult to process.
In order to overcome the above said drawbacks, a new class of
materials has come to be known as semiorganics. In the class of
semiorganic materials, the high efficiency optical quality organic
NLO materials to form the compounds in which a polarizable
organic molecule is stochiometrically bonded to an inorganic
host.
Amino acids and their complexes belong to a family of
organic materials that have applications in NLO [5–8]. Amino
acids are interesting materials for NLO applications as they contain
a proton donor carboxyl acid (COO) group and the proton
acceptor amine (NH2) group with them. l-Arginine, l-arginine
phosphate, l-threonine, l-threonine acetate, l-histidine, lhisditine
hydrochloride are some of the examples which proved
their applications in the field of NLO [9–12].
In the present work, a systematic investigation has been carried
out on the growth of l-valine Hydrochloride for the first
time and the grown crystals have been subjected to single crystal
X-ray diffraction (XRD), Fourier transform infrared (FTIR)
spectroscopy, optical transmission, thermal, second harmonic
generation (SHG) efficiency studies.
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