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Dos Santos KA, Chaves LL, Nadvorny D, de La Roca Soares MF, Sobrinho JLS. Exploring Co-Amorphous Formulations Of Nevirapine: Insights From Computational, Thermal, And Solubility Analyses. AAPS PharmSciTech 2024; 25:214. [PMID: 39266781 DOI: 10.1208/s12249-024-02932-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Accepted: 09/03/2024] [Indexed: 09/14/2024] Open
Abstract
This study aimed to assess the formation of nevirapine (NVP) co-amorphs systems (CAM) with different co-formers (lamivudine-3TC, citric acid-CAc, and urea) through combined screening techniques as computational and thermal studies, solubility studies; in addition to develop and characterize suitable NVP-CAM. NVP-CAM were obtained using the quench-cooling method, and characterized by differential scanning calorimetry (DSC), X-ray diffractometry (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and polarized light microscopy (PLM), in addition to in vitro dissolution in pH 6.8. The screening results indicated intermolecular interactions occurring between NVP and 3TC; NVP and CAc, where shifts in the melting temperature of NVP were verified. The presence of CAc impacted the NVP equilibrium solubility, due to hydrogen bonds. DSC thermograms evidenced the reduction and shifting of the endothermic peaks of NVP in the presence of its co-formers, suggesting partial miscibility of the compounds. Amorphization was proven by XRD and PLM assays. In vitro dissolution study exhibited a significant increase in solubility and dissolution efficiency of NVP-CAM compared to free NVP. Combined use of screening studies was useful for the development of stable and amorphous NVP-CAM, with increased NVP solubility, making CAM promising systems for combined antiretroviral therapy.
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Affiliation(s)
- Kayque Almeida Dos Santos
- Quality Control Core of Medicines and Correlates - NCQMC, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, PE, Brazil
| | - Luíse Lopes Chaves
- Quality Control Core of Medicines and Correlates - NCQMC, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, PE, Brazil
- Postgraduate Program in Pharmaceutical Sciences, Pharmaceutical Sciences Institute, Federal University of Alagoas, Maceió, Alagoas, Brazil
| | - Daniela Nadvorny
- Postgraduate Program in Pharmaceutical Sciences, Pharmaceutical Sciences Institute, Federal University of Alagoas, Maceió, Alagoas, Brazil
| | - Mônica Felts de La Roca Soares
- Quality Control Core of Medicines and Correlates - NCQMC, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, PE, Brazil
- Postgraduate Program in Pharmaceutical Sciences, Pharmaceutical Sciences Institute, Federal University of Alagoas, Maceió, Alagoas, Brazil
| | - José Lamartine Soares Sobrinho
- Quality Control Core of Medicines and Correlates - NCQMC, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, PE, Brazil.
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Pandey J, Prajapati P, Tandon P, Sinha K, Ayala AP, Ellena J. Vibrational and conformational analysis of structural phase transition in Estradiol 17β valerate with temperature. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 263:120219. [PMID: 34332239 DOI: 10.1016/j.saa.2021.120219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 07/03/2021] [Accepted: 07/19/2021] [Indexed: 06/13/2023]
Abstract
Estradiol 17β valerate (E2V) is a hormonal medicine widely used in hormone replacement therapy. E2V undergoes a reversible isosymmetric structural phase transition at low temperature (̴ 250 K) which results from the reorientation of the valerate chain. The reversible isosymmetric structural phase transition follows Ehrenfest's classification when described as first-order and Buerger's classification when classified as order-disorder. The conformational difference also induces changes in molecular torsional angles and on the hydrogen bond pattern. In combination with density functional theory (DFT) calculations, vibrational spectroscopy has been used to correlate the valerate chain modes with the modifications of the dihedral angles on phase transition. We are expecting improvement in our understanding of the phase transition mechanism driven by the temperature. The Conformational analysis reveals the feasible structures corresponding to changes in the dihedral angles associated with the valerate chain. The infrared spectra of calculated conformers are in good agreement with the experimental spectra of E2V structure recorded at room temperature revealing that the changes in valerate chain modes at 1115 cm-1, 1200 cm-1and 1415 cm-1 fingerprint the molecular conformation. An investigation made to determine the ligand-protein interaction of E2V through docking against estrogen receptor (ER) reveals the inhibitive and agonist nature of E2V.
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Affiliation(s)
- Jaya Pandey
- Department of Physics, University of Lucknow, Lucknow 226007, India
| | - Preeti Prajapati
- Department of Physics, University of Lucknow, Lucknow 226007, India
| | - Poonam Tandon
- Department of Physics, University of Lucknow, Lucknow 226007, India.
| | - Kirti Sinha
- Department of Physics, University of Lucknow, Lucknow 226007, India
| | - Alejandro Pedro Ayala
- Departamento de Fìsica, Universidade Federal do Ceará, C.P. 6030, 60.455-900 Fortaleza, CE Brazil
| | - Javier Ellena
- Instituto de Fìsica de São Carlos, Universidade de São Paulo,C.P 369, 13560-970,São Carlos, S P, Brazil
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Elleraas J, Ewanicki J, Johnson TW, Sach NW, Collins MR, Richardson PF. Conformational Studies and Atropisomerism Kinetics of the ALK Clinical Candidate Lorlatinib (PF-06463922) and Desmethyl Congeners. Angew Chem Int Ed Engl 2016; 55:3590-5. [DOI: 10.1002/anie.201509240] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 11/27/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Jeff Elleraas
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Jason Ewanicki
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Ted W. Johnson
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Neal W. Sach
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Michael R. Collins
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Paul F. Richardson
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
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Focus on Chirality of HIV-1 Non-Nucleoside Reverse Transcriptase Inhibitors. Molecules 2016; 21:molecules21020221. [PMID: 26891289 PMCID: PMC6273187 DOI: 10.3390/molecules21020221] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 02/04/2016] [Accepted: 02/08/2016] [Indexed: 02/02/2023] Open
Abstract
Chiral HIV-1 non-nucleoside reverse transcriptase inhibitors (NNRTIs) are of great interest since one enantiomer is often more potent than the corresponding counterpart against the HIV-1 wild type (WT) and the HIV-1 drug resistant mutant strains. This review exemplifies the various studies made to investigate the effect of chirality on the antiretroviral activity of top HIV-1 NNRTI compounds, such as nevirapine (NVP), efavirenz (EFV), alkynyl- and alkenylquinazolinone DuPont compounds (DPC), diarylpyrimidine (DAPY), dihydroalkyloxybenzyloxopyrimidine (DABO), phenethylthiazolylthiourea (PETT), indolylarylsulfone (IAS), arylphosphoindole (API) and trifluoromethylated indole (TFMI) The chiral separation, the enantiosynthesis, along with the biological properties of these HIV-1 NNRTIs, are discussed.
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Elleraas J, Ewanicki J, Johnson TW, Sach NW, Collins MR, Richardson PF. Conformational Studies and Atropisomerism Kinetics of the ALK Clinical Candidate Lorlatinib (PF-06463922) and Desmethyl Congeners. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201509240] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jeff Elleraas
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Jason Ewanicki
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Ted W. Johnson
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Neal W. Sach
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Michael R. Collins
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
| | - Paul F. Richardson
- Oncology Medicinal Chemistry; Pfizer, La Jolla; 10770 Science Center Drive San Diego CA 92121 USA
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Suresh DM, Amalanathan M, Joe IH, Jothy VB, Diao YP. Studies on molecular structure, vibrational spectra and molecular docking analysis of 3-Methyl-1,4-dioxo-1,4-dihydronaphthalen-2-yl 4-aminobenzoate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 130:591-603. [PMID: 24813290 DOI: 10.1016/j.saa.2014.03.043] [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: 11/28/2013] [Revised: 03/11/2014] [Accepted: 03/20/2014] [Indexed: 06/03/2023]
Abstract
The molecular structure, vibrational analysis and molecular docking analysis of the 3-Methyl-1,4-dioxo-1,4-dihydronaphthalen-2-yl 4-aminobenzoate (MDDNAB) molecule have been carried out using FT-IR and FT-Raman spectroscopic techniques and DFT method. The equilibrium geometry, harmonic vibrational wave numbers, various bonding features have been computed using density functional method. The calculated molecular geometry has been compared with experimental data. The detailed interpretation of the vibrational spectra has been carried out by using VEDA program. The hyper-conjugative interactions and charge delocalization have been analyzed using natural bond orbital (NBO) analysis. The simulated FT-IR and FT-Raman spectra satisfactorily coincide with the experimental spectra. The PES and charge analysis have been made. The molecular docking was done to identify the binding energy and the Hydrogen bonding with the cancer protein molecule.
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Affiliation(s)
- D M Suresh
- Department of Physics, Government Arts College, Udhagamandalam, Tamil Nadu, India
| | - M Amalanathan
- Department of Physics, Annai Velankanni College, Tholayavattam 629157, Tamil Nadu, India.
| | - I Hubert Joe
- Centre for Molecular and Biophysics Research, Department of Physics, Mar Ivanios College, Thiruvananthapuram 695 015, Kerala, India
| | - V Bena Jothy
- Department of Physics, Women's Christian College, Nagercoil, Tamil Nadu, India
| | - Yun-Peng Diao
- School of Pharmacy, Dalian Medical University, Dalian 116044, People's Republic of China
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Joshi BD, Srivastava A, Gupta V, Tandon P, Jain S. Spectroscopic and quantum chemical study of an alkaloid aristolochic acid I. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 116:258-269. [PMID: 23954541 DOI: 10.1016/j.saa.2013.07.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Revised: 07/10/2013] [Accepted: 07/21/2013] [Indexed: 06/02/2023]
Abstract
Aristolochic acids (AAs) (Aristolochiaceae) are used in the traditional Chinese herb medicine. We have presented the geometry optimization, electrostatic potential surface, frontier orbital energy gap and vibrational wavenumbers of aristolochic acid I (AA I) using ab initio Hartree-Fock (HF) and density functional theory (DFT/B3LYP) method employing 6-311G(d,p) basis set. A complete vibrational assignment has been done on the basis of calculations on monomer and dimer of AA I. The UV-vis absorption spectrum has been recorded in ethanol solvent and compared with the calculated one in the gas phase as well as in solvent environment (integral-equation formalism polarizable continuum model; IEF-PCM) using TD-DFT/6-31G basis set. A short outline of the NBO analysis segment with their structural meaning has been presented. The variation of thermodynamic properties with temperature was calculated theoretically and the thermal response of the compound has been recorded with the help of differential scanning calorimetry (DSC) in N2 environment.
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Affiliation(s)
- Bhawani Datt Joshi
- Department of Physics, University of Lucknow, Lucknow 226007, India; Department of Physics, Siddhanath Sc. Campus, Tribhuvan University, Nepal
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Sethi A, Bhatia A, Maurya A, Panday A, Bhatia G, Shrivastava A, Singh RP, Prakash R. Proficient synthesis of biologically active pregnane derivatives and its glycoside – Experimental and theoretical approach. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.08.048] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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9
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Chaturvedi D, Gupta V, Tandon P, Sharma A, Baraldi C, Gamberini MC. Intermolecular charge transfer and vibrational analysis of hydrogen bonding in acetazolamide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 99:150-159. [PMID: 23063858 DOI: 10.1016/j.saa.2012.08.063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Revised: 08/06/2012] [Accepted: 08/21/2012] [Indexed: 06/01/2023]
Abstract
In the present work the structural and spectral characteristics of acetazolamide have been studied by methods of infrared, Raman spectroscopy and quantum chemistry. Electrostatic potential surface, optimized geometry, harmonic vibrational frequencies, infrared intensities and activities of Raman scattering were calculated by density functional theory (DFT) employing B3LYP with complete relaxation in the potential energy surface using 6-311++G(d,p) basis set. Based on these results, we have discussed the correlation between the vibrational modes and the structure of the dimers of acetazolamide. The calculated vibrational spectra of three dimers of acetazolamide have been compared with observed spectra, and the assignment of observed bands was carried out using potential energy distribution. The observed spectra agree well with the values computed from the DFT. A comparison of observed and calculated vibrational spectra clearly shows the effect of hydrogen bonding. The frequency shifts observed for the different dimers are in accord with the hydrogen bonding in acetazolamide. Natural bond orbital (NBO) analyses reflect the charge transfer interaction in the individual hydrogen bond units and the stability of different dimers of acetazolamide.
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Affiliation(s)
- Deepika Chaturvedi
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, India
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10
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Chaturvedi D, Mishra S, Tandon P, Portilla-Arias JA, Muñoz-Guerra S. Study of molecular structure and vibrational spectra of poly (β,-l-malic acid) [PMLA] using DFT approach. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Mishra S, Tandon P, Ayala AP. Study on the structure and vibrational spectra of efavirenz conformers using DFT: comparison to experimental data. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 88:116-123. [PMID: 22206896 DOI: 10.1016/j.saa.2011.12.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Accepted: 12/04/2011] [Indexed: 05/31/2023]
Abstract
Efavirenz, (S)-6-chloro-4-(cyclopropylethynyl)-1,4-dihydro-4-(trifluoromethyl)-2H-3,1-benzoxazin-2-one, is an anti HIV agent belonging to the class of the non-nucleoside inhibitors of the HIV-1 virus reverse transcriptase. A systematic quantum chemical study of the possible conformations, their relative stabilities and vibrational spectra of efavirenz has been reported. Structural and spectral characteristics of efavirenz have been studied by vibrational spectroscopy and quantum chemical methods. Density functional theory (DFT) calculations for potential energy curve, optimized geometries and vibrational spectra have been carried out using 6-311++G(d,p) basis sets and B3LYP functionals. Based on these results, we have discussed the correlation between the vibrational modes and the crystalline structure of the most stable form of efavirenz. A complete analysis of the experimental infrared and Raman spectra has been reported on the basis of wavenumber of the vibrational bands and potential energy distribution. The infrared and the Raman spectra of the molecule based on DFT calculations show reasonable agreement with the experimental results. The calculated HOMO and LUMO energies shows that charge transfer occur within the molecule.
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Affiliation(s)
- Soni Mishra
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, India
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12
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Burke EWD, Morris GA, Vincent MA, Hillier IH, Clayden J. Is nevirapine atropisomeric? Experimental and computational evidence for rapid conformational inversion. Org Biomol Chem 2011; 10:716-9. [PMID: 22159411 DOI: 10.1039/c1ob06490h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The non-nucleoside reverse transcriptase inhibitor nevirapine displays in its room temperature (1)H-NMR spectrum signals characteristic of a chiral compound. Following suggestions in the recent literature that nevirapine may display atropisomerism-and therefore be a chiral compound, due to slow interconversion between two enantiomeric conformers-we report the results of an NMR and computational study which reveal that while nevirapine does indeed possess two stable enantiomeric conformations, they interconvert with a barrier of about 76 kJ mol(-1) at room temperature. Nevirapine has a half life for enantiomerisation at room temperature of the order of seconds, is not atropisomeric, and cannot exist as separable enantiomers.
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13
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Characteristic vibration patterns of odor compounds from bread-baking volatiles upon protein binding: density functional and ONIOM study and principal component analysis. J Mol Model 2011; 18:2227-40. [DOI: 10.1007/s00894-011-1227-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 08/16/2011] [Indexed: 10/17/2022]
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Laplante SR, D Fader L, Fandrick KR, Fandrick DR, Hucke O, Kemper R, Miller SPF, Edwards PJ. Assessing atropisomer axial chirality in drug discovery and development. J Med Chem 2011; 54:7005-22. [PMID: 21848318 DOI: 10.1021/jm200584g] [Citation(s) in RCA: 498] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steven R Laplante
- Department of Chemistry, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec, H7S 2G5, Canada.
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Babu RJ, Brostow W, Fasina O, Kalogeras IM, Sathigari S, Vassilikou-Dova A. Encapsulation of hydrophobic drugs in a copolymer: Glass transition behavior and miscibility evaluation. POLYM ENG SCI 2011. [DOI: 10.1002/pen.21949] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Validation of the mPW1PW Quantum chemical calculations for the vibrational study of organic molecules - re-assignment of the isopropylamine vibrational spectra. J PHYS ORG CHEM 2011. [DOI: 10.1002/poc.1713] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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17
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Canotilho J, Castro RAE. The structure of betaxolol studied by infrared spectroscopy and natural bond orbital theory. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 76:395-400. [PMID: 20418154 DOI: 10.1016/j.saa.2010.03.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 03/24/2010] [Accepted: 03/29/2010] [Indexed: 05/29/2023]
Abstract
Betaxolol is a selective beta(1) receptor blocker used in the treatment of hypertension and glaucoma. A study of the betaxolol structure based on infrared spectroscopy and natural bond orbital (NBO) theory is the main aim of the present research. FTIR spectra of the solid betaxolol were recorded in the region from 4000 to 400cm(-1), in the temperature range between 25 and -170 degrees C. For spectral interpretation, spectrum of the deuterated betaxolol and the theoretical vibrational spectra of the conformer present in the solid obtained at the B3LYP/6-31G* level of theory, were used. Further insight into the structure was provided by natural bond orbital theory. NBO analysis of the conformer, before and after optimization, was carried out at the same level of theory referred above. Vibrational modes involved in hydrogen bond in the stretching and bending region were used in the estimation of the enthalpy using empirical correlations between enthalpy and the frequency shift that occurs as a result of the establishment of intermolecular hydrogen bonds. A detailed study of the structure of betaxolol and of its intermolecular interactions was obtained from the combination spectroscopy and NBO theory.
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Affiliation(s)
- João Canotilho
- Center for Pharmaceutical Studies, Faculty of Pharmacy, University of Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba, Coimbra 3000-548, Portugal.
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Molecular structure and vibrational spectroscopic analysis of an antiplatelet drug; clopidogrel hydrogen sulphate (form 2) – A combined experimental and quantum chemical approach. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2009.11.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Structural relationships in the solid state of the anti-chagas agent (E)-phenylethenylbenzofuroxan. Mol Divers 2009; 14:643-52. [DOI: 10.1007/s11030-009-9202-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Accepted: 10/19/2009] [Indexed: 10/20/2022]
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20
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Affiliation(s)
- R K Gilpin
- Brehm Research Laboratory University Park, Wright State University, Fairborn, Ohio 45324-2031, USA
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21
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Ali HRH, Edwards HGM, Kendrick J, Scowen IJ. Vibrational spectroscopic study of terbutaline hemisulphate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 72:715-719. [PMID: 19124270 DOI: 10.1016/j.saa.2008.11.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2008] [Accepted: 11/08/2008] [Indexed: 05/27/2023]
Abstract
The Raman spectrum of terbutaline hemisulphate is reported for the first time, and molecular assignments are proposed on the basis of ab initio BLYP DFT calculations with a 6-31G* basis set and vibrational frequencies predicted within the quasi-harmonic approximation; these predictions compare favourably with the observed vibrational spectra. Comparison with previously published infrared data explains several spectral features. The results from this study provide data that can be used for the preparative process monitoring of terbutaline hemisulphate, an important beta(2) agonist drug in various dosage forms and its interaction with excipients and other components.
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Affiliation(s)
- H R H Ali
- Chemical & Forensic Sciences/University Analytical Centre, University of Bradford, UK
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Mishra S, Chaturvedi D, Tandon P, Gupta VP, Ayala AP, Honorato SB, Siesler HW. Molecular Structure and Vibrational Spectroscopic Investigation of Secnidazole Using Density Functional Theory. J Phys Chem A 2008; 113:273-81. [DOI: 10.1021/jp805399h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | | | | | - H. W. Siesler
- Department of Physical Chemistry, University of Duisburg-Essen, Essen D45117, Germany
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23
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The structure of betaxolol from single crystal X-ray diffraction and natural bond orbital analysis. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.04.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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da Silva CCP, Cuffini SL, Faudone SN, Ayala AP, Ellena J. Low-temperature study of a new nevirapine pseudopolymorph. Acta Crystallogr Sect E Struct Rep Online 2007; 64:o292. [PMID: 21200857 PMCID: PMC2915343 DOI: 10.1107/s1600536807042262] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Accepted: 08/28/2007] [Indexed: 11/23/2022]
Abstract
The title compound (systematic name: 11-cyclopropyl-4-methyl-5,11-dihydro-6H-dipyrido[3,2-b:2′,3′-e][1,4]diazepin-6-one butanol 0.3-solvate), C15H14N4O·0.3C4H9OH, was crystallized in a new triclinic pseudopolymorphic form, a butanol solvate, and the crystal structure determined at 150 K. The molecular conformation of this new form differs from that reported previously, although the main intermolecular hydrogen-bond pattern remains the same. N—H⋯O hydrogen bonds [N⋯O = 2.957 (3) Å] form centrosymmetric dimers and the crystal packing of this new pseudopolymorph generates infinite channels along the b axis.
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