178
B. Ganapayya et al. / Journal of Molecular Structure 1007 (2012) 175–178
Table 4
reference material for the present measurement. The SHG conver-
sion efficiency of DMPP crystal was found to be equal to that of
KDP crystal.
Assignment of vibrational frequencies.
Wave number (cmꢂ1
)
Assignment
3066.58, 2940.89 and
2833.85
1985.69
Asymmetric and symmetric CAH stretching of
methyl group
Combination and week overtone band
C@O stretching vibration
4. Conclusions
1658.60
The new NLO optical chalcone derivative, DMPP was synthe-
sized and single crystals of this compound was successfully grown
by the solution growth technique at room temperature using ace-
tone as a solvent. FT-IR is used to confirm the functional groups of
the grown crystal. Single-crystal XRD studies were carried out to
determine the cell parameters. The UV–vis–NIR spectrum reveals
that, in the crystal, the absorption takes place in the UV region
and the crystal is transparent in the entire visible region. This crys-
tal has powder SHG conversion efficiency equal to that of KDP. Due
to the presence of a wide transparency range and higher second
harmonic efficiency the crystal may be used for NLO applications.
DMPP crystal is thermally stable up to 79.49 °C, and can be sug-
gested for NLO applications below 80 °C.
1568.56
1471.58
1271.6
C@C aromatic stretching
CAH bending vibrations
Aryl CAO stretching (asymmetric CAOAC
stretching)
Symmetric CAOAC stretching vibrations (alkyl
CAO stretching)
1072.74
984.68 and 771.35
Characteristic CAH out-of-plane aromatic bending
Acknowledgement
The authors express their grateful thanks to Prof. T.N. Guru
Row, Indian Institute of Science, Bangalore for providing the single
crystal X-ray diffraction facility.
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