382
S. Sumathi et al. / Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 97 (2012) 377–383
Table 7
aromatic aldehydes and their metal complexes [MLCl2] for M: L ra-
tio 1:1 of Cu(II), Co(II), Ni(II) were obtained. An octahedral struc-
ture has been proposed for all the metal(II) complexes. Though
some Knoevenagel condensed complexes have been found in re-
cent literature, these have been rarely seen as nonlinear optical
material in terms of second harmonic generation (SHG) efficiency.
In our system all the ligands (L1–L3) of Knoevenagel condensate
found to exhibit considerable nonlinear optical (NLO) property in
comparison with urea and KDP. All the ligands and its metal(II)
complexes are fluorescent in nature. Metal(II) complexes exhibited
a considerable antimicrobial activity compared to the free ligands.
Fluorescence parameters of ligand (L1–L3) and its metal(II) complexes in DMSO.
Compound
Emission maximum (nm)
L1
L2
L3
Ligand (L)
439, 541
354, 427
411, 510
Cu(II) complex
Co(II) complex
Ni(II) complex
591,768,785
621,698,783
578,789,792
517,793,800
520,784,795
681,783,794
545,789,796
498,788,797
669,778,793
Table 8
Acknowledgements
SHG parameters of different knoevenagel condensate of 3-(aryl)-pentane-2,4-dione.
Compound SHG efficiency with respect to SHG efficiency with respect to
Authors thank the Management of Thiagarajar College, Madurai
and one of the authors (P.T.) thanks the Defence Research and
Development Organization (DRDO), New Delhi for providing finan-
cial support and SAIF, IIT, Bombay and SAIF, CDRI, Lucknow for
analytical facilities.
KDP
urea
L1
L2
L3
0.4
4.6
0.5
0.09
1.05
0.11
Appendix Supplementary. data
Table 9
Supplementary data associated with this article can be found, in
Anti microbial activity of the ligands (L1–L3) and their metal(II) complexes (zone of
inhibition in mma; concentration in 10ꢀ3 mol/L).
Compound
P. aeruginosa S. aureus
E. coli
C. albicans
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