TY  - JOUR
AU  - Savić, Tatjana D.
AU  - Čomor, Mirjana I.
AU  - Nedeljković, Jovan M.
AU  - Veljković, Dušan Ž.
AU  - Zarić, Snežana D.
AU  - Rakic, Vesna M.
AU  - Janković, Ivana A.
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1848
AB  - The surface modification of nanocrystalline TiO2 particles (45 angstrom) with catecholate-type ligands having different electron donating/electron withdrawing substituent groups, specifically 3-methylcatechol, 4-methylcatechol, 3-methoxycatechol, 3,4-dihydroxybenzaldehyde and 4-nitrocatechol, was found to alter the optical properties of nanoparticles in a similar way to catechol. The formation of the inner-sphere charge-transfer (CT) complexes results in a red shift of the semiconductor absorption compared to unmodified nanocrystallites and a reduction of the effective band gap, being slightly less pronounced in the case of electron withdrawing substituents. The investigated ligands have the optimal geometry for binding to surface Ti atoms, resulting in ring coordination complexes of the catecholate type (binuclear bidentate binding-bridging) thus restoring six-coordinated octahedral geometry of surface Ti atoms. From the absorption measurements (Benesi-Hildebrand plot), the stability constants in methanol/water = 90/10 solutions at pH 2 in the order of 10(3) M-1 have been determined. The binding structures were investigated by using FTIR spectroscopy. Thermal stability of CT-complexes was investigated by using TG/DSC/MS analysis. Quantum chemical calculations on model systems using density functional theory (DFT) were performed to obtain the vibrational frequencies of charge transfer complexes, and the calculated values were compared with the experimental data.
PB  - Royal Soc Chemistry, Cambridge
T2  - Physical Chemistry Chemical Physics
T1  - The effect of substituents on the surface modification of anatase nanoparticles with catecholate-type ligands: a combined DFT and experimental study
VL  - 16
IS  - 38
SP  - 20796
EP  - 20805
DO  - 10.1039/c4cp02197e
ER  - 

@article{
author = "Savić, Tatjana D. and Čomor, Mirjana I. and Nedeljković, Jovan M. and Veljković, Dušan Ž. and Zarić, Snežana D. and Rakic, Vesna M. and Janković, Ivana A.",
year = "2014",
abstract = "The surface modification of nanocrystalline TiO2 particles (45 angstrom) with catecholate-type ligands having different electron donating/electron withdrawing substituent groups, specifically 3-methylcatechol, 4-methylcatechol, 3-methoxycatechol, 3,4-dihydroxybenzaldehyde and 4-nitrocatechol, was found to alter the optical properties of nanoparticles in a similar way to catechol. The formation of the inner-sphere charge-transfer (CT) complexes results in a red shift of the semiconductor absorption compared to unmodified nanocrystallites and a reduction of the effective band gap, being slightly less pronounced in the case of electron withdrawing substituents. The investigated ligands have the optimal geometry for binding to surface Ti atoms, resulting in ring coordination complexes of the catecholate type (binuclear bidentate binding-bridging) thus restoring six-coordinated octahedral geometry of surface Ti atoms. From the absorption measurements (Benesi-Hildebrand plot), the stability constants in methanol/water = 90/10 solutions at pH 2 in the order of 10(3) M-1 have been determined. The binding structures were investigated by using FTIR spectroscopy. Thermal stability of CT-complexes was investigated by using TG/DSC/MS analysis. Quantum chemical calculations on model systems using density functional theory (DFT) were performed to obtain the vibrational frequencies of charge transfer complexes, and the calculated values were compared with the experimental data.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Physical Chemistry Chemical Physics",
title = "The effect of substituents on the surface modification of anatase nanoparticles with catecholate-type ligands: a combined DFT and experimental study",
volume = "16",
number = "38",
pages = "20796-20805",
doi = "10.1039/c4cp02197e"
}

Savić, T. D., Čomor, M. I., Nedeljković, J. M., Veljković, D. Ž., Zarić, S. D., Rakic, V. M.,& Janković, I. A.. (2014). The effect of substituents on the surface modification of anatase nanoparticles with catecholate-type ligands: a combined DFT and experimental study. in Physical Chemistry Chemical Physics
Royal Soc Chemistry, Cambridge., 16(38), 20796-20805.
https://doi.org/10.1039/c4cp02197e

Savić TD, Čomor MI, Nedeljković JM, Veljković DŽ, Zarić SD, Rakic VM, Janković IA. The effect of substituents on the surface modification of anatase nanoparticles with catecholate-type ligands: a combined DFT and experimental study. in Physical Chemistry Chemical Physics. 2014;16(38):20796-20805.
doi:10.1039/c4cp02197e .

Savić, Tatjana D., Čomor, Mirjana I., Nedeljković, Jovan M., Veljković, Dušan Ž., Zarić, Snežana D., Rakic, Vesna M., Janković, Ivana A., "The effect of substituents on the surface modification of anatase nanoparticles with catecholate-type ligands: a combined DFT and experimental study" in Physical Chemistry Chemical Physics, 16, no. 38 (2014):20796-20805,
https://doi.org/10.1039/c4cp02197e . .