1
|
|
2
|
Al-Ansari IAZ. Effects of Structure and Environment on the Spectroscopic Properties of (3-Amino-Substituted-Thieno[2,3-b] Pyridine-2-yl)Pyridine/Quinolin-2-yl)(Phenyl)Methanones: Experimental and Theoretical Study. J Fluoresc 2016; 26:821-34. [PMID: 26856341 DOI: 10.1007/s10895-016-1770-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 01/14/2016] [Indexed: 10/22/2022]
Abstract
The electronic absorption, excitation and fluorescence properties of two 3-amino-substituted-thieno[2,3-b]pyridine/quinolin-2-yl)(phenyl)methanones; (referred to as compounds 1-2: where 3-amino-4,5,6-trimethyl-thieno[2,3-b]pyridin-2-yl)(phenyl)methanone (1); and 3-amino-5,6,7,8-tetrahydro-thieno[2,3-b]quinolin-2-yl)(phenyl)methanone (2)) have been investigated in solvents of various polarity and hydrogen-bonding abilities. Results based on the electronic absorption, excitation and emission study of these compounds; indicated that singlets (S1 and S2) excited-states are populated in non-polar and polar protic/aprotic solvents giving dual fluorescence with weak charge transfer separation. The experimental results were interpreted with the aid of quantum chemistry calculations carried out with the DFT and TD-DFT/B3lyp/6-31 + G(d,p) methods. Based on these calculations, compounds 1-2 exist in two rotamers: anti and syn, separated by ca. 5-6 kcal mol(-1) energy barriers in favor of the anti-conformer. The anti-structure, was shown to be stabilized through existence of intramolecular NH…O hydrogen bond (H-b), which plays a dominant role in affecting the energy of the HOMO-1 molecular orbital. Further, methyl/alkyl substitution in the pyridyl-thiophene ring was shown to involve in σ-π hyper-conjugation and destabilization of the HOMO-1 MO's.
Collapse
Affiliation(s)
- Ibrahim Ahmed Z Al-Ansari
- Department of Chemistry & Earth Sciences, College of Arts & Sciences, Qatar University, P.O. Box: 2713, Doha, Qatar.
| |
Collapse
|
3
|
Tursun M, Parlak C. Conformation stability, halogen and solvent effects on CO stretching of 4-chloro-3-halogenobenzaldehydes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 141:58-63. [PMID: 25659813 DOI: 10.1016/j.saa.2015.01.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Revised: 01/09/2015] [Accepted: 01/14/2015] [Indexed: 06/04/2023]
Abstract
The effects of halogen and solvent on the conformation and carbonyl stretching of 4-chloro-3-halogenobenzaldehydes [C7H4ClXO; X=F (CFB), Cl (CCB) or Br (CBB)] were investigated using the density functional theory (DFT) method. The B3LYP functional was used by the 6-311+G(3df,p) basis set in combination with the polarizable continuum model (PCM). Computations were focused on the cis and trans isomers of the compounds in 18 different polar or non-polar organic solvents. The theoretical frequencies of the solvent-induced CO stretching vibrations were correlated with the empirical solvent parameters such as the Kirkwood-Bauer-Magat (KBM) equation, the solvent acceptor number (AN), Swain parameters and the linear solvation energy relationships (LSER). The present work explores the effect of both the halogen and medium on the conformational preference and CO vibrational frequency. The findings of this work can be useful to those systems involving changes in the conformations analogous to the compounds studied.
Collapse
Affiliation(s)
- Mahir Tursun
- Department of Physics, Dumlupınar University, Kütahya 43100, Turkey
| | - Cemal Parlak
- Department of Physics, Dumlupınar University, Kütahya 43100, Turkey.
| |
Collapse
|
4
|
Polat T. Theoretical study of the solvent effects on the molecular structure and vibrational spectra of 2-hydroxy-4-methyl-3-nitropyridine. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.03.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
5
|
Tekin N, Pir H, Sagdinc S. Study of the solvent effects on the molecular structure and CO stretching vibrations of flurbiprofen. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 98:122-131. [PMID: 22986052 DOI: 10.1016/j.saa.2012.08.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 08/10/2012] [Accepted: 08/21/2012] [Indexed: 06/01/2023]
Abstract
The effects of 15 solvents on the C=O stretching vibrational frequency of flurbiprofen (FBF) were determined to investigate solvent-solute interactions. Solvent effects on the geometry and C=O stretching vibrational frequency, ν(C=O), of FBF were studied theoretically at the DFT/B3LYP and HF level in combination with the polarizable continuum model and experimentally using attenuated total reflection infrared spectroscopy (ATR-IR). The calculated C=O stretching frequencies in the liquid phase are in agreement with experimental values. Moreover, the wavenumbers of ν(C=O) of FBF in different solvents have been obtained and correlated with the Kirkwood-Bauer-Magat equation (KBM), the solvent acceptor numbers (ANs), and the linear solvation energy relationships (LSERs). The solvent-induced stretching vibrational frequency shifts displayed a better correlation with the LSERs than with the ANs and KBM.
Collapse
Affiliation(s)
- Nalan Tekin
- Kocaeli University, Faculty of Science and Literature, Department of Chemistry, Kocaeli 41380, Turkey.
| | | | | |
Collapse
|
6
|
Shi JH, Fan CH. FT-IR study on interactions between medroxyprogesterone acetate and solvent in CHCl₃/cyclo-C6H₁₂ and CCl₄/cyclo-C6H₁₂ binary solvent systems. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 95:230-234. [PMID: 22634415 DOI: 10.1016/j.saa.2012.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Accepted: 05/01/2012] [Indexed: 06/01/2023]
Abstract
The intermolecular interactions between medroxyprogesterone acetate (MPA) and CHCl(3) and CCl(4) solvent in CHCl(3)/cyclo-C(6)H(12) and CCl(4)/cyclo-C(6)H(12) binary solvent systems have been studied by Fourier transform infrared spectroscopy (FT-IR). The experimental results showed that there are hydrogen bonding interactions between oxygen atoms of all carbonyl groups in MPA and hydrogen atom of CHCl(3) so as to form 1:3 complex of MPA with CHCl(3) and produce three new absorption bands at 1728.9-1736.1, 1712.7-1717.4 and 1661.9-1673.8 cm(-1), respectively. And, 1:1 complex of MPA with CCl(4) is formed in CCl(4)/cyclo-C(6)H(12) binary solvent as a result of hydrogen bonding interaction between C3 carbonyl group and empty d-orbital in chlorine atom of CCl(4) leading to producing new absorption band at 1673.2-1674.2 cm(-1). However, all free carbonyl and associated carbonyl stretching vibrations of MPA in CHCl(3)/cyclo-C(6)H(12) and CCl(4)/cyclo-C(6)H(12) binary solvent systems shift to lower wavenumbers with the increasing of volume fraction of CHCl(3) and CCl(4) in binary solvent systems owing to the dipole-dipole interaction and the dipole-induced dipole interaction between MPA and solvents.
Collapse
Affiliation(s)
- Jie-hua Shi
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310032, China.
| | | |
Collapse
|
7
|
Dharmalingam K, Ramachandran K, Sivagurunathan P. FTIR Study of Molecular Interaction in Butyl Methacrylate–Organic Solvents Mixtures. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zpch.2006.220.6.739] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
FTIR spectroscopic study of butyl methacrylate (BMA) in different pure organic solvents were undertaken to investigate the solute–solvent interactions. The frequency of carbonyl stretching vibration ν(C=O) of BMA is correlated with the solvent properties such as the KBM parameter, the solvent acceptor number (AN), and the linear salvation energy relationships (LSER). The solvent-induced stretching vibration frequency shifts showed a better correlation with LSER parameters than AN. While no linear correlation between dielectric constants and the frequencies showed that the KBM relationship was unsuitable for this molecule. Also the solvent effect on the strength of hydrogen bond formation between free OH group of 1-butanol and C=O group of BMA is discussed in terms of local specific interaction between the solute and solvent.
Collapse
|
8
|
Vdovenko SI, Gerus II, Kukhar VP. Solvent influence on the infrared spectra of beta-alkoxyvinyl methyl ketones II. Stretching vibrations and integrated intensities of carbonyl and vinyl bands of (3Z,E)-4-ethoxy-1,1,1-trifluoro-5,5-dimethylhex-3-en-2-one. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 72:229-235. [PMID: 19111504 DOI: 10.1016/j.saa.2008.06.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2008] [Revised: 06/17/2008] [Accepted: 06/18/2008] [Indexed: 05/27/2023]
Abstract
Infrared spectroscopy studies of beta-alkoxyvinyl trifluoromethyl ketone, with structure C(2)H(5)O-C(C(CH(3))(3))CH-COCF(3) (1), in twenty three different pure organic solvents were undertaken to investigate the solvent-solute interactions and to correlate solvent properties such as Reichard's parameter and solvatochromic parameters of Kamlet, Abbot, and Taft with carbonyl and vinyl stretching vibrations and their integrated intensities of existing spatial forms. It was shown that conjugation in CC-CO system of the (E-s-Z-o-Z) stereoisomer is higher than that in this system of the (Z-s-Z-o-Z) stereoisomer. From derived correlations of the v (CO) and v (CC) wavenumbers with solvatochromic parameters of Kamlet, Abbot, and Taft it is followed that the solvent polarity influences on the v (CO) and v (CC) wavenumbers more intense than the solvent HBD acidity, and, at the same time, the influence of these solvent properties is greater for the (E-s-Z-o-Z) stereoisomer. Analysis of derived KAT multiple regressions showed that the increase of the solvent polarity/polarizability (pi*) increased the conjugation in both stereoisomers, whereas the increase of the solvent HBD acidity (alpha) had opposite effect on conjugation in the (Z-s-Z-o-Z) and (E-s-Z-o-Z) stereoisomer. In the former case conjugation was weakened, whereas in the latter it was enhanced. These discrepancies were the consequence of different structure of H-bonded complexes between enone 1 and HBD solvents. The influence of the solvent HBA basicity (beta) also had peculiarity. The increase of the solvent HBA basicity disturbs the CC-CO conjugation in the (Z-s-Z-o-Z) stereoisomer due to carbonyl rotation, whereas in the (E-s-Z-o-Z) stereoisomer such increase enhanced this conjugation and, hence, increased the v (CO) and v (C==C) coupling.
Collapse
Affiliation(s)
- Sergey I Vdovenko
- Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Sciences of Ukraine, ul.Murmanska 1, 02094, Kiev, Ukraine.
| | | | | |
Collapse
|
9
|
Zhang F, Zhang H, Fang D, Liu Q. Infrared study of 6-methylcoumarin in binary solvent mixtures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:710-713. [PMID: 18359661 DOI: 10.1016/j.saa.2008.01.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 01/14/2008] [Accepted: 01/22/2008] [Indexed: 05/26/2023]
Abstract
The infrared absorption spectra of the carbonyl stretching vibrations of 6-methylcoumarin (6MC) have been investigated in CCl4/ROH mixtures (CCl4/C2H5OH, CCl4/n-C3H7OH, CCl4/i-C3H7OH, and CCl4/t-C5H11OH). Two types of carbonyl stretching vibration bands for 6MC are found with the change of the mole fraction of the aprotic solvent CCl4(X CCl4 in binary solvent mixtures. The dependencies of the frequencies of carbonyl stretching vibrations upsilon(C=O) on X CCl4 allow a distinction and assignment of all species resulting from the solvent-solute interactions. Linear correlations between the upsilon(C=O) of each species and X CCl4 are found. The influence on the transformation of some species caused by the self-associated alcohols is discussed.
Collapse
Affiliation(s)
- Feiying Zhang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China
| | | | | | | |
Collapse
|
10
|
Varfolomeev MA, Abaidullina DI, Klimovitskii AE, Solomonov BN. Solvent effect on stretching vibration frequencies of the N-H and O-H groups of diphenylamine and phenol in complexes with various proton acceptors: Cooperative effect. RUSS J GEN CHEM+ 2007. [DOI: 10.1134/s1070363207100131] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
11
|
Liu Q, Wang XY, Zhang H. Solvent effects on infrared spectra of progesterone in CHCl3/cyclo-C6H12 binary solvent systems. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 66:202-7. [PMID: 17055777 DOI: 10.1016/j.saa.2006.02.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2005] [Accepted: 02/22/2006] [Indexed: 05/12/2023]
Abstract
The infrared spectroscopy studies of the C3 and C20 carbonyl stretching vibrations (upsilon(C=O)) of progesterone in CHCl3/cyclo-C6H12 binary solvent systems were undertaken to investigate the solute-solvent interactions. With the mole fraction of CHC13 in the binary solvent mixtures increase, three types of C3 and C20 carbonyl stretching vibration band of progesterone are observed, respectively. The assignments of upsilon(C=O) of progesterone are discussed in detail. In the CHCl3-rich binary solvent systems or pure CHCl3 solvent, two kinds of solute-solvent hydrogen bonding interactions coexist for C20 C=O. Comparisons are drawn for the solvent sensitivities of upsilon(C=O) for acetophenone and 5alpha-androstan-3,17-dione, respectively.
Collapse
Affiliation(s)
- Qing Liu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
| | | | | |
Collapse
|
12
|
Liu Q, Liu Y, Zhang H, Wen Z. Solvent effects on infrared spectroscopy of 17beta-hydroxy-17-methyl-2-oxa-5alpha-androstan-3-one in single solvents. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 65:164-8. [PMID: 16352466 DOI: 10.1016/j.saa.2005.09.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2005] [Revised: 09/30/2005] [Accepted: 09/30/2005] [Indexed: 05/05/2023]
Abstract
Infrared spectroscopy studies of 17beta-hydroxy-17-methyl-2-oxa-5alpha-androstan-3-one (HMOA) in 20 different pure organic solvents were undertaken to investigate the solute-solvent interactions and to correlate solvent properties, such as the KBM equation, the solvent acceptor number (AN), Schleyer's linear free energy equation (G-value), Dimroth and Reichardt's parameter E(T)(30) and Brownstein's parameter S with the frequency shifts of the carbonyl stretching vibration for solute. The result indicated that the KBM relationship is unsuitable to the complicated molecules. These frequencies exhibited a better correlation with the solvent parameters AN and G-value than others.
Collapse
Affiliation(s)
- Qing Liu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China
| | | | | | | |
Collapse
|
13
|
FT-IR study on solvent effects in building blocks of bioactive compounds. V. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.12.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
14
|
Solomonov BN, Varfolomeev MA, Novikov VB, Klimovitskii AE. New thermochemical parameter for describing solvent effects on IR stretching vibration frequencies. Communication 1. Assessment of van der Waals interactions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 64:397-404. [PMID: 16332454 DOI: 10.1016/j.saa.2005.07.036] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2005] [Revised: 07/08/2005] [Accepted: 07/13/2005] [Indexed: 05/05/2023]
Abstract
Solvent effects on OH stretching vibrations in several complexes with hydrogen bonding have been investigated by FTIR spectroscopy. To assess the influence of van der Waals (vdW) interactions on frequency shifts, a new parameter of solvent, square root deltacavhS, is proposed. This parameter has been derived from equations describing enthalpy of non-specific solvation. Linear correlation was established between the OH frequency shift (with respect to the gas phase) and parameter square root deltacavhS for a series of complexes of aliphatic alcohols with standard proton acceptors. Linear correlations with square root deltacavhS were also observed for a series of "free" O-H and also C=O, P=O, S=O and C-Br stretching vibrations. A new method is proposed for estimating the gas-phase stretching frequency from IR spectra of solutions. In addition, frequencies of "free" X-H groups in neat bases were deduced from the experimental data.
Collapse
Affiliation(s)
- Boris N Solomonov
- Chemical Institute, Kazan State University, Kremlevskaya 18, Kazan 420008, Russia.
| | | | | | | |
Collapse
|
15
|
Conti C, Galeazzi R, Giorgini E, Tosi G. FT-IR of trichloroacetoimidates in different solvent systems. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2004.11.086] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
16
|
Bruni P, Conti C, Galeazzi R, Giorgini E, Tosi G. FT-IR of unsaturated β-amino acids in different solvents systems. J Mol Struct 2003. [DOI: 10.1016/s0022-2860(02)00634-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
17
|
Liu Q, Xu X, Sang W. Solvent effects on infrared spectra of 2-acetylthiophene in organic solvents. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:471-475. [PMID: 12524117 DOI: 10.1016/s1386-1425(02)00215-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Infrared spectroscopy studies of 2-acetylthiophene (ACTH) in 18 different organic solvents, both polar and non-polar, were undertaken to investigate the solvent-solute interactions. The frequencies of carbonyl stretching vibration upsilon(C=O) of ACTH were correlated with the properties such as the solvent acceptor number (AN) and the linear solvation energy relationships (LSER). The solvent-induced stretching vibration frequency shifts showed a better correlation with the LSER than the AN. A six-membered ring-like hydrogen bonding structure was presented and the solvent effects of ACTH in alcohol solvents were investigated in detail.
Collapse
Affiliation(s)
- Qing Liu
- Department of Chemistry, Zhejiang University, 310027, Hangzhou, People's Republic of China.
| | | | | |
Collapse
|
18
|
Solvent effects on infrared spectra of 5-methyl-7-methoxy-iso-flavone in single solvent systems. J Mol Struct 2002. [DOI: 10.1016/s0022-2860(01)00965-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
19
|
|