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Title: Trans-dichlorobis(N-p-tolylpyridin-2-amine)palladium(II): Synthesis, structure, fluorescence features and DNA binding
Authors: Kundu, Suman
Maity, Suvendu
Bhadra, Ranjan
Ghosh, Prasanta
Keywords: Density functional calculations
Fluorescence quenching
DNA binding
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: Reaction of N-p-tolylpyridin-2-amine (LMe) with H2PdCl4 in boiling acetonitrile and ethanol solvents mixture (1:1) affords trans-Pd(LMe)2Cl2 (1) in high yield. (1) is substantiated by spectral data, single crystal X-ray structure determination, etc. Both (LMe) and (1) absorb strongly in the UV region ( max, nm (, 104 M–1cm–1), DCM: (LMe), 310 (1.97), 276 (4.95); (1), 320 (4.36), 270 (6.98). (LMe) is brightly fluorescent due to intra-ligand charge transfer singlet excited state ( ex = 332 nm, em = 400 nm; = 0.621 measured with respect to anthracene) as elucidated by DFT and TD DFT calculations. In (1), the luminescence of (LMe) is significantly (~ 97 %) quenched ( = 0.016) and the fluorescence parameters are red shifted ( ex = 378 nm, em = 430 nm). Binding of (1) to CT-DNA has been investigated by UV-vis spectrum confirming a significant interaction with the intrinsic binding constant as Kb = ~ 9.78 X 105 M-1 and CT-DNA-ethidium bromide fluorescence quenching experiment giving the apparent binding constant as Kapp = 9.02 X 105 M –1.
Page(s): 1443-1449
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-0975(Online); 0376-4710(Print)
Source:IJC-A Vol.50A(09-10) [September-October 2011]

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