1
|
An Experimental and Theoretical Test of Dielectric Friction Models Using Rotational Diffusion of 7-Diethylamino-2-H-1-Benzopyran-2-One in Non-associative Solvents. J Fluoresc 2019; 29:899-909. [PMID: 31273534 DOI: 10.1007/s10895-019-02402-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 06/10/2019] [Indexed: 10/26/2022]
Abstract
The rotational re-orientations times of the 7-DHB dye molecule have been examined in non-associative solvents (DMSO and Octanenitrile) by varying the temperature, by employing the Steady-State Fluorescence Depolarisation and Time-Correlated Single Photon Counting (TCSPC) techniques. Rotational re-orientations time values in DMSO are found larger by a factor of 1.136 than octanenitrile, which indicates that 7-DHB laser dye is experiencing higher friction in DMSO than octanenitrile. To determine mechanical friction Stokes Einstein's Debye theory (SED) -with a stick, slip boundary conditions parameters are used and found an interesting super slip trend. Point dipole models as Nee-Zwanzig (NZ) and van der Zwan-Hynes (ZH) fail to explain experimental dielectric friction observed trends. Alavi-Waldeck model successfully explains the observed dielectric friction trend in non-associative solvents.
Collapse
|
2
|
Kumar A, Nadaf Y, Renuka C, Ananthamurthy S. Investigations of mechanical and dielectric friction: Rotational reorientation studies of 7-DHB, Qu-390, and C-6H molecules in polar solvents. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.120] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
3
|
Kumar A, Renuka C, Nadaf Y. Fluorescence relaxation dynamics in excited electronic states of -(1,3-benzothiazol-2-yl)-7-(diethylamino) chromen-2-one (3-BDC) in alcohols. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.069] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
4
|
Kumar A, Nadaf YF, Renuka CG. Rotational Diffusion of Medium Sized 7-[Diethylamino]-2H-1-Benzopyran-2-One Molecule in Alcohols: Study of Temperature and Solvent Viscosity Effect. J Fluoresc 2019; 29:587-597. [PMID: 30949877 DOI: 10.1007/s10895-019-02370-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 03/19/2019] [Indexed: 11/30/2022]
Abstract
The rotational re-orientations times of the 7-[diethylamino]-2H-1-benzopyran-2-one (7-DHB) dye molecule have been examined in ethanol and octanol solvents when macroscopic solvent viscosity parameter is varied by varying the temperature, by employing the steady-state fluorescence depolarisation and Time-Correlated Single Photon Counting (TCSPC) techniques. Experimental observation shows that 7-DHB probe is experiencing higher friction in octanol compared to ethanol and rotates slower by a factor of 7.3. The hydrodynamic Stokes Einstein's Debye theory (SED) with a stick, slip boundary conditions parameters, quasi-hydrodynamic models (Dote-Kivelson-Schwartz and Geirer-Wirtz) were used to determine mechanical friction and found an interesting towards super slip trend. Dielectric frictional theories of point dipole, Nee-Zwanzig and van der Zwan-Hynes both models fail to describe experimentally observe dielectric friction trends. Evidently, both hydrodynamic and dielectric models failed to explain the examined behavior, even in the qualitative way in alcohols.
Collapse
Affiliation(s)
- Anil Kumar
- P.G. Department of Physics, Sri Siddeshwara Govt., First Grade College, Naragund, 582207, India
| | - Y F Nadaf
- Department of Physics and Research Center, Maharani Science College for Women, Bengaluru, 560001, India
| | - C G Renuka
- Department of Physics, Jnanabharathi campus, Bangalore University, Bengaluru, 560056, India.
| |
Collapse
|
5
|
Banerjee R, Purkayastha P. Interaction of coumarin 6 with carbon nanotubes: Disintegration of the microcrystalline state by surfactant aggregation on the nanotube surface. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.08.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
6
|
Singh R, Kaur P, Sachdeva R, Grewal JS, Sathe V, Saini G. Computational study of effect of solvents on vibrational spectra of coumarin 500. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2018.03.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
7
|
Chemate S, Sekar N. Indole-Based NLOphoric Donor-π-Acceptor Styryl Dyes: Synthesis, Spectral Properties and Computational Studies. J Fluoresc 2016; 26:2063-2077. [PMID: 27530631 DOI: 10.1007/s10895-016-1901-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 08/04/2016] [Indexed: 10/21/2022]
Abstract
Donor-π- acceptor styryl chromophores based on indole core were synthesized by Knoevenagel condensation of N-ethyl indole-3-carbaldehyde and different active methylene compounds. The absorption and emission properties of these dyes in different solvents were studied. The dyes displayed a broad absorption maximum in the UV and visible region between 397 and 469 nm with FWHM, 50 to 75 nm. Due to the extended π - conjugated systems this styryl chromophores shows strong intramolecular charge transfer characteristics. The dyes showed solid state emission and emission in solid state was red shifted as compared to their emission in less polar solvents. Density Functional Theory [B3LYP/6-311 + G(d)] computations were used to correlate the structural, molecular, electronic and photo physical parameters of styryl dye with experimental study. Synthesized dyes were confirmed by using FT-IR, 1H NMR, 13C NMR and HRMS spectral analysis.
Collapse
Affiliation(s)
- Santosh Chemate
- Department of Dyestuff Technology, Institute of Chemical Technology, Mumbai, 400 019, India
| | - Nagaiyan Sekar
- Department of Dyestuff Technology, Institute of Chemical Technology, Mumbai, 400 019, India.
| |
Collapse
|
8
|
Kumar S, Puttaraju B, Patil S. A Deep‐Blue Electroluminescent Device Based on a Coumarin Derivative. Chempluschem 2016; 81:384-390. [DOI: 10.1002/cplu.201500572] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 03/03/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Shiv Kumar
- Solid State and Structural Chemistry UnitIndian Institute of Science Bangalore 560012 India
| | - Boregowda Puttaraju
- Solid State and Structural Chemistry UnitIndian Institute of Science Bangalore 560012 India
| | - Satish Patil
- Solid State and Structural Chemistry UnitIndian Institute of Science Bangalore 560012 India
| |
Collapse
|
9
|
|
10
|
Xu J, Chen J, Dong S, Fu A, Li H, Chu T. Excited-state hydrogen bond strengthening of coumarin 153 in ethanol solvent: a TDDFT study. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3537] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jinmei Xu
- College of Information Science and Engineering; Ocean University of China; Qingdao 266100 China
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 China
| | - Junsheng Chen
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 China
| | - Shunle Dong
- College of Information Science and Engineering; Ocean University of China; Qingdao 266100 China
| | - Aiping Fu
- Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory and College of Physics, College of Chemistry; Qingdao University; Qingdao 266071 People's Republic of China
| | - Hongliang Li
- Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory and College of Physics, College of Chemistry; Qingdao University; Qingdao 266071 People's Republic of China
| | - Tianshu Chu
- Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory and College of Physics, College of Chemistry; Qingdao University; Qingdao 266071 People's Republic of China
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 China
| |
Collapse
|
11
|
Banerjee R, Mondal S, Purkayastha P. Revival, enhancement and tuning of fluorescence from Coumarin 6: combination of host–guest chemistry, viscosity and collisional quenching. RSC Adv 2016. [DOI: 10.1039/c6ra20884c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The self-quenched fluorescence of Coumarin 6 can be revived by host–guest chemistry and further increased by about 40% on increasing the solvent viscosity and hence restricting the motion of the molecules.
Collapse
Affiliation(s)
- Rajashree Banerjee
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Kolkata
- Mohanpur 741246
- India
| | - Somen Mondal
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Kolkata
- Mohanpur 741246
- India
| | - Pradipta Purkayastha
- Department of Chemical Sciences
- Indian Institute of Science Education and Research (IISER) Kolkata
- Mohanpur 741246
- India
| |
Collapse
|
12
|
Ruiz CC, Hierrezuelo JM, Molina-Bolivar JA. Analysis of the Photophysical Behavior and Rotational-Relaxation Dynamics of Coumarin 6 in Nonionic Micellar Environments: The Effect of Temperature. Molecules 2015; 20:19343-60. [PMID: 26512635 PMCID: PMC6332106 DOI: 10.3390/molecules201019343] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 10/08/2015] [Accepted: 10/16/2015] [Indexed: 12/25/2022] Open
Abstract
The photodynamics of Coumarin 6 have been investigated in three nonionic micellar assemblies, i.e., n-dodecyl-β-D-maltoside (β-C12G₂), p-tert-octyl-phenoxy polyethylene (9.5) ether (Triton X-100 or TX100) and n-dodecyl-hexaethylene-glycol (C12E₆), to assess their potential use as encapsulation vehicles for hydrophobic drugs. To evaluate the effect of the micellar size and hydration, the study used a broad temperature range (293.15-323.15 K). The data presented here include steady-state absorption and emission spectra of the probe, dynamic light scattering, together with fluorescence lifetimes and both steady-state, as well as time-resolved fluorescence anisotropies. The time-resolved fluorescence anisotropy data were analyzed on the basis of the well-established two-step model. Our data reveal that the molecular probe in all of the cases is solubilized in the hydration layer of micelles, where it would sense a relatively polar environment. However, the probe was found to undergo a slower rotational reorientation when solubilized in the alkylpolyglycoside surfactant, as a result of a more compact microenvironment around the probe. The behavior of the parameters of the reorientation dynamics with temperature was analyzed on the basis of both micellar hydration and the head-group flexibility of the surfactants.
Collapse
Affiliation(s)
- Cristóbal Carnero Ruiz
- Department of Applied Physics II, Engineering School, University of Malaga, Malaga 29071, Spain.
| | - José Manuel Hierrezuelo
- Department of Applied Physics II, Engineering School, University of Malaga, Malaga 29071, Spain.
| | | |
Collapse
|
13
|
Tangod VB, Mastiholi BM, Raikar P, Kulkarni SG, Raikar US. Studies of the photophysics of highly fluorescent Red Mega 480 laser dye in solutions: Steady state spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 148:105-113. [PMID: 25875032 DOI: 10.1016/j.saa.2015.03.119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 03/25/2015] [Accepted: 03/27/2015] [Indexed: 06/04/2023]
Abstract
The absorption and fluorescence spectra of highly fluorescent industrially useful medium sized Red Mega 480 dye have been studied in various solvents at 298 K. The solute photophysical behavior depends strongly on the solute-solvent interactions. In order to understand the effect of inter molecular interactions on spectral behaviors of the dye in different solvents extent of this behavior can be analyzed by linear solvation energy relationships. In addition, ground and excited state dipole moments were evaluated by various methods. It is observed that excited state dipole moment (μe) is larger than the ground state (μg), absorption spectra show a bathochromic shift with increasing polarity indicating that transition involved is π→π(∗) and Onsager cavity radius is determined by atomic increment method.
Collapse
Affiliation(s)
- V B Tangod
- Department of Physics, Karnatak University, Dharwad, Karnataka, India
| | - B M Mastiholi
- Department of Physics, Karnatak University, Dharwad, Karnataka, India
| | - Prasad Raikar
- Visveswaraya Technological University, Belgaum, Karnataka, India
| | - S G Kulkarni
- Department of Physics, Karnatak University, Dharwad, Karnataka, India
| | - U S Raikar
- Department of Physics, Karnatak University, Dharwad, Karnataka, India.
| |
Collapse
|
14
|
Padalkar VS, Lanke SK, Chemate SB, Sekar N. N-2-Aryl-1,2,3-Triazoles: A Novel Class of Blue Emitting Fluorophores-Synthesis, Photophysical Properties Study and DFT Computations. J Fluoresc 2015; 25:985-96. [PMID: 25976087 DOI: 10.1007/s10895-015-1580-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 05/04/2015] [Indexed: 01/17/2023]
Abstract
Novel fluorescent 2-[4-(4,5-diphenyl-1H-imidazol-2-yl) phenyl]-2H-naphtho [1,2-d] [1,2,3] triazolyl derivatives were synthesized from 4-(4,5-diphenyl-1H-imidazol-2-yl) aniline and substituted naphthalen-2-amine. The photophysical properties of the three new fluorophores were evaluated in acetonitrile, methanol, dimethylsulfoxide and N,N-dimethylformamide solvents and were compared with the reported analogs. The compounds show the absorption in the ultraviolet region and the emission in the blue region. The thermal stabilities of these compounds was evaluated by thermogravimetric analysis. The solvatochromism data are used for ground and excited state dipole moment determination of the synthesized triazoles using Bakhshiev and Bilot-Kawski correlations. The experimental absorption and emission were compared with the theoretical data obtained by DFT and TD-DFT computations and they are well in agreement with each other.
Collapse
Affiliation(s)
- Vikas S Padalkar
- Tinctorial Chemistry Group, Institute of Chemical Technology, N. P. Marg, Matunga, Mumbai, 400 019, Maharashtra, India
| | | | | | | |
Collapse
|
15
|
Synthesis of Novel Carbazole Fused Coumarin Derivatives and DFT Approach to Study Their Photophysical Properties. J Fluoresc 2014; 24:1503-18. [DOI: 10.1007/s10895-014-1436-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 08/11/2014] [Indexed: 01/22/2023]
|
16
|
An KL, Shin SR, Jun K, Park SY. The Synthesis and Light Absorption Behaviour of Novel Coumarin Chromophores. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2014. [DOI: 10.5012/jkcs.2014.58.3.297] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
17
|
Satam MA, Telore RD, Tathe AB, Gupta VD, Sekar N. A combined theoretical and experimental investigation on the solvatochromism of ESIPT3-(1,3-benzothiazol-2-yl)-2-hydroxynaphthalene-1-carbaldehyde. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 127:16-24. [PMID: 24632151 DOI: 10.1016/j.saa.2014.01.120] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 01/16/2014] [Accepted: 01/26/2014] [Indexed: 06/03/2023]
Abstract
Excited state intramolecular proton transfer inspired 3-(1,3-benzothiazol-2-yl)-2-hydroxynaphthalene-1-carbaldehyde, showing solid state fluorescence has been synthesized. Existence of excited state intramolecular proton transfer process between carbonyl group and phenolic OH group has been theoretically predicted using computational method. Density functional theory and time dependent density functional theory computations have been used to investigate structural parameters and understand the photophysical properties of the synthesized carbaldehyde. The photophysical properties of carbaldehyde were evaluated using UV-Visible and fluorescence spectroscopy and are found to be very sensitive to the microenvironment such as solvent polarity and pH. The experimental absorption-emission a results are correlated with the computed values. The increase in the dipole moment of A2-Keto(*) than A2-Enol(*) suggested the presence of keto form in the excited state and which is responsible for the single fluorescence emission with a large Stokes shift in all solvents.
Collapse
Affiliation(s)
- Manjaree A Satam
- Tinctorial Chemistry Group, Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai 400 019, India
| | - Rahul D Telore
- Tinctorial Chemistry Group, Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai 400 019, India
| | - Abhinav B Tathe
- Tinctorial Chemistry Group, Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai 400 019, India
| | - Vinod D Gupta
- Tinctorial Chemistry Group, Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai 400 019, India
| | - Nagaiyan Sekar
- Tinctorial Chemistry Group, Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai 400 019, India.
| |
Collapse
|
18
|
van Wilderen LJGW, Messmer AT, Bredenbeck J. Mixed IR/Vis Two-Dimensional Spectroscopy: Chemical Exchange beyond the Vibrational Lifetime and Sub-ensemble Selective Photochemistry. Angew Chem Int Ed Engl 2014; 53:2667-72. [DOI: 10.1002/anie.201305950] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 10/31/2013] [Indexed: 11/06/2022]
|
19
|
van Wilderen LJGW, Messmer AT, Bredenbeck J. Mixed IR/Vis Two-Dimensional Spectroscopy: Chemical Exchange beyond the Vibrational Lifetime and Sub-ensemble Selective Photochemistry. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201305950] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
20
|
TDDFT Investigation of the Electronic Structures and Photophysical Properties of Fluorescent Extended Styryl Push-Pull Chromophores Containing Carbazole Unit. J Fluoresc 2013; 23:1121-38. [DOI: 10.1007/s10895-013-1241-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 05/22/2013] [Indexed: 10/26/2022]
|
21
|
Messmer AT, Lippert KM, Steinwand S, Lerch EBW, Hof K, Ley D, Gerbig D, Hausmann H, Schreiner PR, Bredenbeck J. Two-Dimensional Infrared Spectroscopy Reveals the Structure of an Evans Auxiliary Derivative and Its SnCl4Lewis Acid Complex. Chemistry 2012; 18:14989-95. [DOI: 10.1002/chem.201201583] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Indexed: 11/12/2022]
|
22
|
Naous M, Aguiar J, Ruiz CC. Synergism in mixtures of n-octyl-β-d-thioglucoside and different n-alkyltrimethylammonium bromides: effect of the alkyl chain length. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2617-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
23
|
Donovalová J, Cigáň M, Stankovičová H, Gašpar J, Danko M, Gáplovský A, Hrdlovič P. Spectral properties of substituted coumarins in solution and polymer matrices. Molecules 2012; 17:3259-76. [PMID: 22418928 PMCID: PMC6268095 DOI: 10.3390/molecules17033259] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 03/07/2012] [Accepted: 03/08/2012] [Indexed: 11/26/2022] Open
Abstract
The absorption and fluorescence spectra of substituted coumarins (2-oxo-2H-chromenes) were investigated in solvents and in polymer matrices. The substitutions involved were: (1) by groups with varying electron donating ability such as CH3, OCH3 and N(CH3)2, mainly, but not exclusively, in positions 7 and (2), by either CHO or 4-PhNHCONHN=CH- in position 3. While the spectra of non-substituted coumarin-3-carbaldehyde has absorptions at approximately 305 and 350 nm, substitution at position 7 leads to remarkable changes in the shape of the absorption spectrum and shifts the absorption to a longer wavelength. Similarly, the replacement of the formyl group with a semicarbazide group substantially influences the shape of the absorption spectrum, and coumarins which have only N(CH3)2 in position 7 experience small changes. These changes are associated with the increasing intramolecular charge transfer (ICT) character and increasing conjugation length of the chromophoric system, respectively, in the studied molecules. The fluorescence is almost negligible for derivatives which have H in this position. With increasing electron donating ability, and the possibility of a positive mesomeric (+M) effect of the substituent in position 7 of the coumarin moiety, the fluorescence increases, and this increase is most intense when N(CH3)2 substitutes in this position, for both 3-substituted derivatives. Spectral measurements of the studied coumarins in polymer matrices revealed that the absorption and fluorescence maxima lay within the maxima for solvents, and that coumarins yield more intense fluorescence in polymer matrices than when they are in solution. The quantum yield of derivatives which have a dimethylamino group in position 7 in polymer matrices approaches 1, and the fluorescence lifetime is within the range of 0.5–4 ns. The high quantum yield of 7-dimethylamino derivatives qualifies them as laser dyes which have kF higher than knr in the given medium. This is caused by stiffening of the coumarin structure in polar polymer matrices, such as PMMA and PVC, due to higher micro-viscosity than in solution and intermolecular dipole-dipole interaction between chromophore (dopant) and matrix.
Collapse
Affiliation(s)
- Jana Donovalová
- Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovak Republic; (M.C.); (H.S.); (J.G.); (A.G.); (P.H.)
- Author to whom correspondence should be addressed; ; Tel.: +421-2-6029-6306; Fax: +421-2-6029-6337
| | - Marek Cigáň
- Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovak Republic; (M.C.); (H.S.); (J.G.); (A.G.); (P.H.)
| | - Henrieta Stankovičová
- Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovak Republic; (M.C.); (H.S.); (J.G.); (A.G.); (P.H.)
| | - Jan Gašpar
- Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovak Republic; (M.C.); (H.S.); (J.G.); (A.G.); (P.H.)
| | - Martin Danko
- Polymer Institute, Slovak Academy of Sciences, 845 41 Bratislava, Dúbravská cesta 9, Slovak Republic;
| | - Anton Gáplovský
- Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovak Republic; (M.C.); (H.S.); (J.G.); (A.G.); (P.H.)
| | - Pavol Hrdlovič
- Faculty of Natural Sciences, Institute of Chemistry, Comenius University, Mlynská dolina CH-2, SK-842 15 Bratislava, Slovak Republic; (M.C.); (H.S.); (J.G.); (A.G.); (P.H.)
- Polymer Institute, Slovak Academy of Sciences, 845 41 Bratislava, Dúbravská cesta 9, Slovak Republic;
| |
Collapse
|
24
|
Gahlaut R, Tewari N, Bridhkoti J, Joshi N, Joshi H, Pant S. Determination of ground and excited state dipole moments of some naphthols using solvatochromic shift method. J Mol Liq 2011. [DOI: 10.1016/j.molliq.2011.08.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
25
|
Characterization of mixed non-ionic surfactants n-octyl-β-d-thioglucoside and octaethylene–glycol monododecyl ether: Micellization and microstructure. J Colloid Interface Sci 2011; 361:178-85. [DOI: 10.1016/j.jcis.2011.05.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 05/06/2011] [Accepted: 05/06/2011] [Indexed: 11/22/2022]
|
26
|
On the ground and excited state dipole moments of dansylamide from solvatochromic shifts of absorption and fluorescence spectra. J Mol Liq 2011. [DOI: 10.1016/j.molliq.2011.03.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
27
|
Dawson K, Lovera P, Iacopino D, O'Riordan A, Redmond G. Multi-colour emission from dye doped polymeric nanotubes by host–guest energy transfer. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12647d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
28
|
Hrdlovic P, Donovalova J, Stankovicova H, Gaplovsky A. Influence of polarity of solvents on the spectral properties of bichromophoric coumarins. Molecules 2010; 15:8915-32. [PMID: 21139531 PMCID: PMC6259138 DOI: 10.3390/molecules15128915] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 12/01/2010] [Accepted: 12/06/2010] [Indexed: 11/29/2022] Open
Abstract
Absorption and fluorescence spectra of bichromophoric coumarins were investigated in different solvents and in polymer matrices. These bichromophoric coumarins were composed of a coumarin dimethylamino-substituted at position 7 or unsubstituted coumarin and phthalimide or a 1,8-naphthylimide linked with an iminomethyl bridge to the position 3 or 8 of the coumarin ring. Absorption spectra of 7-dimethylamino derivatives in position 3 of coumarin were quite similar, exhibiting broad bands around 430-440 nm like the parent compound 7-dimethylaminocoumarin-3-carbaldehyde. For coumarin derivatives substituted in position 8, the absorption maximum was shifted to shorter wavelength as for derivatives without position 7 dimethylamino substitution. The most intense fluorescence was observed for 7-(N,N-dimethylamino)-3-[(N-phtalimidoyl)iminomethyl]coumarin in polar solvent, while intense fluorescence was observed for 7-(N,N-dimethylamino)-3-[N-(1,3-dioxobenz[de]isoquinolinyl)iminomethyl]-coumarin in non polar solvent (chloroform), comparable with the fluorescence of 7-amino-4-methylcoumarin. Spectral measurements of bichromophoric coumarins in polymer matrices revealed that the maxima lies in between those for chloroform and methanol yielding more intense fluorescence then in solutions. Completely different solvent effects were observed for 7-(N,N-dimethylamino)-3-[N-(1,3-dioxobenz[de]isoquinolinyl)imino-methyl]coumarin and 7-(N,N-dimethylamino)-3-[(N-phtalimidoyl)iminomethyl]coumarin. With addition of polar methanol the intensity of fluorescence decreases, yielding a Stern-Volmer-like constant of 0.54 dm³ mol⁻¹ for 7-(N,N-dimethylamino)-3-[N-(1,3-dioxo-benz[de]isoquinolinyl)iminomethyl]coumarin and an even higher one of 1.08 dm³·mol⁻¹ for 7-dimethylaminocoumarin-3-carbaldehyde compared to the rather low one of 0.024 dm³ mol⁻¹ for 7-amino-4-methylcoumarin. Contrary to this, addition of methanol under identical conditions brings about an increase in fluorescence intensity of 7-(N,N-dimethylamino)-3-[(N-phtalimidoyl)iminomethyl]coumarin (about 60-fold). The reasons for these different solvent effects are discussed.
Collapse
Affiliation(s)
- Pavol Hrdlovic
- Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Dúbravska cesta 9, Slovakia; E-Mail: (P.H.)
| | - Jana Donovalova
- Institute of Chemistry, Faculty of Natural Sciences, Comenius University, Mlynska dolina CH-2, SK-842 15 Bratislava, Slovakia; E-Mails: (H.S); (A.G.)
| | - Henrieta Stankovicova
- Institute of Chemistry, Faculty of Natural Sciences, Comenius University, Mlynska dolina CH-2, SK-842 15 Bratislava, Slovakia; E-Mails: (H.S); (A.G.)
| | - Anton Gaplovsky
- Institute of Chemistry, Faculty of Natural Sciences, Comenius University, Mlynska dolina CH-2, SK-842 15 Bratislava, Slovakia; E-Mails: (H.S); (A.G.)
| |
Collapse
|
29
|
Molina-Bolívar J, Ruiz CC. Light scattering and fluorescence studies of non-ionic surfactant binary mixtures formed by MEGA-10 and C12E8. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2010.05.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
30
|
Rautela R, Joshi N, Joshi H, Tewari N, Pant S. Solvatochromic study of 2-hydroxy-4-methylquinoline for the determination of dipole moments and solute–solvent interactions. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2010.04.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
31
|
Solvent Effects on the Spectroscopic Properties of Styrylquinolinium Dyes Series. J Fluoresc 2009; 20:73-86. [DOI: 10.1007/s10895-009-0524-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2009] [Accepted: 07/21/2009] [Indexed: 10/20/2022]
|