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Kartal Z, Şahin O. Synthesis of two Hofmann type and Hofmann-type-like compounds in crystal form from 4-aminopyridine and their characterizations by various methods. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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2
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Kartal Z, Şahin O. Synthesis, X-ray crystallography characterization, and DFT theoretical studies of a new metal compound [CdCl2(4-aminopyridine)2]n. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130720] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Alves SR, Santos RLSR, Fornaciari B, Colquhoun A, de Oliveira Silva D. A novel μ-oxo-diruthenium(III,III)-ibuprofen-(4-aminopyridine) chloride derived from the diruthenium(II,III)-ibuprofen paddlewheel metallodrug shows anticancer properties. J Inorg Biochem 2021; 225:111596. [PMID: 34601164 DOI: 10.1016/j.jinorgbio.2021.111596] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 08/24/2021] [Accepted: 08/28/2021] [Indexed: 10/20/2022]
Abstract
Diruthenium(II,III) metal-metal multiply bonded paddlewheel complexes bearing non-steroidal anti-inflammatory drugs are promising anticancer metallodrugs. The [Ru2(Ibp)4Cl] (Ibp, ibuprofenate anion from HIbp ibuprofen drug), free or encapsulated, shows anticancer activity against glioblastoma (in vitro, in vivo), and against human breast and prostate cancer cells. Herein we report the interaction of [Ru2(Ibp)4Cl] and of [Ru2(Ac)4(H2O)2]PF6 (Ac, acetate) with the 4-aminopyridine (4Apy) drug. The N-ligand was capable of cleaving the paddlewheel unit with oxidation of Ru2(II,III) to Ru2(III,III)O μ-oxo core in the ibuprofen complex while the acetate complex underwent axial substitution of water by 4Apy. Carefully designed synthetic and chromatographic methods succeeded in giving the novel [Ru2O(Ibp)2(4Apy)6]Cl2 metallodrug, the first diruthenium(III,III) μ-oxo having chloride as counterion. Characterization was performed by elemental analysis, mass spectrometry, thermogravimetric analysis, electronic absorption and vibrational spectroscopies, molar conductivity and cyclic voltammetry. Kinetic studies for the μ-oxo complex (in 50:50 v/v ethanol:water) suggested an aquation/complexation equilibrium in consecutive step reactions with the exchange of the two 4Apy trans to the μ-oxo bridge by water (aquation) and the back coordination of 4Apy in excess of the N-ligand (complexation). Trypan blue assays for the novel compound showed time- and dose- dependent antiproliferative effects (at 5-50 μmol L-1) and cytotoxicity (> 20 μmol L-1), and MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide) assays gave IC50 value of 7.6 ± 1.5 μmol L-1 (at 48 h, 1-20 μmol L-1) against U87MG human glioblastoma cells (aggressive brain glioma cancer) pointing the metallodrug as potential candidate for novel therapies in gliomas.
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Affiliation(s)
- Samara R Alves
- Laboratory for Synthetic and Structural Inorganic Chemistry - Bioinorganic and Metallodrugs, Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, B2T, 05508-000 São Paulo, SP, Brazil
| | - Rodrigo L S R Santos
- Laboratory for Synthetic and Structural Inorganic Chemistry - Bioinorganic and Metallodrugs, Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, B2T, 05508-000 São Paulo, SP, Brazil; Department of Exact and Technological Sciences, State University of Santa Cruz, Rod. Jorge Amado, Km 16, 45662-900 Ilhéus, BA, Brazil
| | - Bárbara Fornaciari
- Laboratory for Synthetic and Structural Inorganic Chemistry - Bioinorganic and Metallodrugs, Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, B2T, 05508-000 São Paulo, SP, Brazil
| | - Alison Colquhoun
- Department of Cell and Developmental Biology, Institute of Biomedical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 1524, 05508-000 São Paulo, SP, Brazil
| | - Denise de Oliveira Silva
- Laboratory for Synthetic and Structural Inorganic Chemistry - Bioinorganic and Metallodrugs, Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, B2T, 05508-000 São Paulo, SP, Brazil.
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Shegani A, Ischyropoulou M, Roupa I, Kiritsis C, Makrypidi K, Papasavva A, Raptopoulou C, Psycharis V, Hennkens HM, Pelecanou M, Papadopoulos MS, Pirmettis I. Synthesis and evaluation of new mixed "2 + 1" Re, 99mTc and 186Re tricarbonyl dithiocarbamate complexes with different monodentate ligands. Bioorg Med Chem 2021; 47:116373. [PMID: 34467870 DOI: 10.1016/j.bmc.2021.116373] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 11/24/2022]
Abstract
A series of "2 + 1" mixed ligand tricarbonyl complexes of the general formula fac-[Re/99mTc/186Re(CO)3(DDTC)(L)] containing diethyldithiocarbamate (DDTC) as a monoanionic bidentate ligand and a series of monodentate ligands L was synthesized, characterized and evaluated. The impact of ligand L on the radiochemical yield (RCY) and biodistribution of the final compounds was also investigated. DDTC and the appropriate L ligand [cyclohexyl isocyanide (cisc), tert-butyl isocyanide (tbi), triphenylphosphine (PPh3), methyldiphenylphosphine (PPh2Me), triphenylarsine (AsPh3), imidazole (im), and 4-aminopyridine (4AP)] readily reacted in equimolar amounts with the [Et4N]2[Re(CO)3Br3] precursor to afford fac-[Re(CO)3(DDTC)(cisc)], Re1, fac-[Re(CO)3(DDTC)(tbi)], Re2, fac-[Re(CO)3(DDTC)(PPh3)], Re3, fac-[Re(CO)3(DDTC)(PPh2Me)], Re4, fac-[Re(CO)3(DDTC)(AsPh3)], Re5, fac-[Re(CO)3(DDTC)(im)], Re6 and fac-[Re(CO)3(DDTC)(4AP)], Re7, complexes in high yields (>80%). All Re complexes were fully characterized by IR, NMR, and in addition Re4, Re5, and Re7 with X-ray crystallography. Analogous reactions as performed with Re were subsequently explored on the 99mTc and 186Re-tracer levels using the corresponding fac-[99mTc/186Re(CO)3(H2O)3]+ precursor. Complexes 99mTc1 - 99mTc5, 186Re1 and 186Re3 were obtained in high radiochemical yield (>91%), while the complexes 99mTc6, 99mTc7 and 186Re7 formed with radiochemical yields of 55%, 28%, and 75%, respectively. The 99mTc and 186Re-complexes were characterized by comparative HPLC analysis using the analogous Re complexes. During histidine and cysteine challenge experiments at 37 °C through 6 h, complexes 99mTc1 - 99mTc5 remained > 92% stable, while complexes 99mTc6 and 99mTc7 remained only 8% stable through 3 h. Similar studies for 186Re-complexes showed that 186Re1 and 186Re3 remained > 95% stable for up to 48 h, while 186Re7 had decreased to 7% after 3 h. LogD7.4 data of 99mTc1 - 99mTc5, 186Re1, and 186Re3 complexes, which ranged from 2.59 to 3.39, suggested high lipophilicity. Biodistribution studies in healthy Swiss albino mice showed hepatobiliary excretion for 99mTc1, 99mTc2, and 99mTc4, fast blood clearance for 99mTc4, while high liver uptake and retention for 99mTc3 and 99mTc5 were measured. Moreover, 99mTc2 showed high accumulation in the lungs with sustained retention (52.80% ID/g at 4 h p.i.) and significant brain uptake at 2 min p.i. (1.89% ID/g). The study showed the great influence of monodentate ligand in the synthesis and biodistribution of the mixed ligand complexes.
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Affiliation(s)
- Antonio Shegani
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece; Research Reactor Center, University of Missouri, Columbia, MO 65211, United States
| | - Myrto Ischyropoulou
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Ioanna Roupa
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Christos Kiritsis
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Konstantina Makrypidi
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Afroditi Papasavva
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Catherine Raptopoulou
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Vassilis Psycharis
- Institute of Nanoscience and Nanotechnology, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Heather M Hennkens
- Research Reactor Center, University of Missouri, Columbia, MO 65211, United States; Department of Chemistry, University of Missouri, Columbia, MO 65211, United States
| | - Maria Pelecanou
- Institute of Biosciences & Applications, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Minas S Papadopoulos
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece
| | - Ioannis Pirmettis
- Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Center for Scientific Research "Demokritos", 15310 Athens, Greece.
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The synthesis of heteroleptic cyanometallate aminopyridine complexes and an investigation into their structural properties with various spectroscopic methods. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Siddiqui N, Javed S. Quantum computational, spectroscopic investigations on ampyra (4-aminopyridine) by dft/td-dft with different solvents and molecular docking studies. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129021] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Wazzan NA. Charge transfer complexes between 2-, 3- and 4-aminopyridines and some π-acceptors in the gas phase and in chloroform: DFT calculations. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2016. [DOI: 10.1142/s0219633616500292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This work reports density functional theory (DFT) calculations on the molecular structures, electronic distribution, and UV-Vis and IR spectroscopy analysis of charge transfer complexes between aminopyridines (APYs), namely 2-APY, 3-APY and 4-APY, as electron-donors and some [Formula: see text]-electron-acceptors, namely chloranil (CHL), tetracyanoethylene (TCNE) and picryl chloride (PC), formed in the gas phase at the B3LYP/6-31[Formula: see text]G(d,p) method/basis set, and in chloroform at the same method/basis set using PCM as solvation model. Good correspondence was generally obtained between the calculated parameters and the experimental ones.
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Affiliation(s)
- Nuha Ahmed Wazzan
- King Abdulaziz University, Chemistry Department, Faculty of Science, Jeddah, Saudi Arabia
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A New Photoluminescent Co(II)-Diphosphate Cluster Templated by Fampridine Cation: Synthesis and Biophysicochemical Evaluation. J CLUST SCI 2016. [DOI: 10.1007/s10876-015-0966-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Mohamed TA, Shaaban IA, Farag RS, Zoghaib WM, Afifi MS. Synthesis, antimicrobial activity, structural and spectral characterization and DFT calculations of Co(II), Ni(II), Cu(II) and Pd(II) complexes of 4-amino-5-pyrimidinecarbonitrile. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 135:417-427. [PMID: 25105264 DOI: 10.1016/j.saa.2014.07.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 06/25/2014] [Accepted: 07/02/2014] [Indexed: 06/03/2023]
Abstract
Co(II), Ni(II), Cu(II) and Pd(II) complexes of 4-amino-5-pyrimidinecarbonitrile (APC) have been synthesized and characterized using elemental analysis, magnetic susceptibility, mass spectrometry, infrared (4000-200 cm(-1)), UV-Visible (200-1100 nm), (1)H NMR and ESR spectroscopy as well as TGA analysis. The molar conductance measurements in DMSO imply non-electrolytic complexes, formulated as [M(APC)2Cl2] where M=Co(II), Ni(II), Cu(II) and Pd(II). The infrared spectra of Co(II), Ni(II) and Cu(II) complexes indicate a bidentate type of bonding for APC through the exocyclic amino and adjacent pyrimidine nitrogen as donors whereas APC coordinated to Pd(II) ion as a monodentated ligand via a pyrimidine nitrogen donor. The magnetic measurements and the electronic absorption spectra support distorted octahedral geometries for Co(II), Ni(II) and Cu(II) complexes however a square planar complex was favored for the Pd(II) complex (C2h skeleton symmetry). In addition, we carried out B3LYP and ω-B97XD geometry optimization at 6-31G(d) basis set except for Pd(II) where we implemented LanL2DZ/6-31G(d) combined basis set. The computational results favor all trans geometrical isomers where amino N, pyrimidine N and Cl are trans to each other (structure 1). Finally, APC and its divalent metal ion complexes were screened for their antibacterial activity, and the synthesized complexes were found to be more potent antimicrobial agents than APC against one or more microbial species.
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Affiliation(s)
- Tarek A Mohamed
- Department of Chemistry, Faculty of Science (Men's Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt.
| | - Ibrahim A Shaaban
- Department of Chemistry, Faculty of Science (Men's Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt
| | - Rabei S Farag
- Department of Chemistry, Faculty of Science (Men's Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt
| | - Wajdi M Zoghaib
- Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khod, Oman
| | - Mahmoud S Afifi
- Department of Chemistry, Faculty of Science (Men's Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt
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Experimental and quantum chemical studies of the electronic absorption spectra of pyrimidine derivatives. JOURNAL OF SAUDI CHEMICAL SOCIETY 2013. [DOI: 10.1016/j.jscs.2011.11.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Lee M, Rho J, Lee DE, Hong S, Choi SJ, Messersmith PB, Lee H. Water Detoxification by a Substrate-Bound Catecholamine Adsorbent. Chempluschem 2012; 77:987-990. [PMID: 23745174 PMCID: PMC3670806 DOI: 10.1002/cplu.201200209] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Mihyun Lee
- Department of Chemistry, The Graduate School of Nanoscience and Technology, Korea, Advanced Institute of Science and Technology (KAIST), 335 Science Rd. Daejeon, 305-701, South Korea
| | - Junsung Rho
- Biomedical Engineering, Materials Science and Engineering, Chemical and Biological Engineering Department, Northwestern University, Evanston, IL 60208 (USA)
| | - Dong-Eun Lee
- Radioisotope Research Division, Research Reactor Utilization and Development, KAERI, Daejeon, 305-353, South Korea
| | - Seonki Hong
- Department of Chemistry, The Graduate School of Nanoscience and Technology, Korea, Advanced Institute of Science and Technology (KAIST), 335 Science Rd. Daejeon, 305-701, South Korea
| | - Sun-Ju Choi
- Radioisotope Research Division, Research Reactor Utilization and Development, KAERI, Daejeon, 305-353, South Korea
| | - Phillip B. Messersmith
- Biomedical Engineering, Materials Science and Engineering, Chemical and Biological Engineering Department, Northwestern University, Evanston, IL 60208 (USA)
| | - Haeshin Lee
- Department of Chemistry, The Graduate School of Nanoscience and Technology, Korea, Advanced Institute of Science and Technology (KAIST), 335 Science Rd. Daejeon, 305-701, South Korea
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Çırak Ç, Demir S, Ucun F, Çubuk O. Experimental and theoretical study on the structure and vibrational spectra of β-2-aminopyridinium dihydrogenphosphate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:529-532. [PMID: 21530380 DOI: 10.1016/j.saa.2011.03.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 02/28/2011] [Accepted: 03/11/2011] [Indexed: 05/30/2023]
Abstract
Experimental and theoretical vibrational spectra of β-2-aminopyridinium dihydrogenphosphate (β-2APDP) have been investigated. The FT-IR spectrum of β-2APDP was recorded in the region 4000-400 cm(-1). The optimized molecular structure and theoretical vibrational frequencies of β-2APDP have been investigated using ab initio Hartree-Fock (HF) and density functional B3LYP method with 6-311++G(d,p) basis set. The optimized geometric parameters (bond lengths and bond angles) and theoretical frequencies have been compared with the corresponding experimental data and it is found that they agree well with each other. All the assignments of the theoretical frequencies were performed by potential energy distributions using VEDA 4 program. Furthermore, the used scale factors were obtained from the ratio of the frequency values of the strongest peaks in the experimental and theoretical IR spectra. From the results it was concluded that the B3LYP method is superior to the HF method for the vibrational frequencies.
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Affiliation(s)
- Çağrı Çırak
- Department of Physics, Faculty of Arts and Sciences, Erzincan University, 24100 Erzincan, Turkey.
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Lu H, Wang H, Feng S. A new way to construct luminescent functionalized silicon hybrid material derived from methyldichlorosilane. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2009.12.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Ferrer EG, Baeza N, Naso LG, Castellano EE, Piro OE, Williams PAM. Superoxidedismutase-mimetic copper(II) complexes containing saccharinate and 4-aminopyridine/4-cyanopyridine. J Trace Elem Med Biol 2010; 24:20-6. [PMID: 20122575 DOI: 10.1016/j.jtemb.2009.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2008] [Revised: 09/23/2009] [Accepted: 09/28/2009] [Indexed: 11/17/2022]
Abstract
Two copper(II) complexes, [Cu(sac)(2)(4-cypy)(2)(H(2)O)], 1 and [Cu(sac)(2)(4-Ampy)(2)(H(2)O)], 2 (4-cypy: 4-cyanopyridine; 4-Ampy: 4-aminopyridine) were prepared. Physicochemical properties of the complexes were studied by spectroscopic (solution UV-vis, diffuse reflectance and IR) techniques. Structural X-ray diffraction data could be obtained only for [Cu(sac)(2)(4-cypy)(2)(H(2)O)] that it crystallized in the tetragonal space group P4cc with a=b=15.313(1), c=13.240(1)A, and Z=4 molecules per unit cell. The complex was cited on a crystallographic C(2)-axis with the Cu(II) ion in a square-pyramidal environment, coordinated at the pyramid basis to the nitrogen atom of two saccharine anions [d(Cu-N)=2.011(3)A] and the pyridine N-atom of two 4-cyanopyridine ligands [d(Cu-N)=2.038(4)A]. The coordination was completed by a water molecule at the pyramid apex [d(Cu-Ow)=2.189(5)A]. Elemental and spectroscopic analyses revealed an O-saccharinate coordination mode for complex 2 and a square-pyramidal structure. Only complex 2 retained its structure in methanolic solution. However, both complexes were able to catalyze the dismutation of superoxide anion (O(2)(-)) (pH 7.5) at micromolar concentrations. Therefore, these complexes behaved as useful SOD-mimetic compounds.
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Affiliation(s)
- Evelina G Ferrer
- Centro de Química Inorgánica (CEQUINOR/CONICET, UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. Correo 962, 1900 La Plata, Argentina
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On the tautomerism and color origin in solid state of Npy-protonated-2-aminopyridine: spectroscopic elucidation. Struct Chem 2009. [DOI: 10.1007/s11224-009-9522-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Koleva BB, Kolev T, Seidel RW, Tsanev T, Mayer-Figge H, Spiteller M, Sheldrick WS. Spectroscopic and structural elucidation of 4-dimethylaminopyridine and its hydrogensquarate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:695-702. [PMID: 18343192 DOI: 10.1016/j.saa.2008.01.033] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2007] [Revised: 01/03/2008] [Accepted: 01/18/2008] [Indexed: 05/26/2023]
Abstract
A distortion of the aromatic character and stabilization of the imino-form as a result of the protonation of 4-dimethylaminopyridine was established by IR-, UV- and 1H NMR-spectral analysis of 4-diaminopyridinium hydrogensquarate. Quantum chemical calculations were carried out at MP2 and B3LYP levels of theory and a 6-311++G** basis set with a view to determining the changes in geometrical parameters and IR-spectroscopic characteristics resulting from Npy protonation. Linear-dichroic IR-spectroscopy coupled with the orientation techniques of solid samples as liquid crystal suspensions and melted solid polycrystalline films was applied for the identification of the IR-bands, characteristic for the structural fragments of the neutral and imino-form of the pyridine derivative. The spectral results were compared with the structure, obtained by a single crystal X-ray analysis. The salt contains dimmers of hydrogensquarate anions and Npy protonated cations of which the former are stabilized by strong intermolecular OH...O interactions (2.552 angstroms and 143.1(2) degrees). The 4-diaminopyridinium cation interacts with the anion through moderate NH...O bonds (2.729 angstroms and 165.0(0) degrees ). Individual cations are pi-pi stacked with their neighbors at a distance of 3.406 angstroms.
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Affiliation(s)
- Bojidarka B Koleva
- Lehrstuhl für Analytische Chemie, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany.
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Brennan NF, Blom B, Lotz S, van Rooyen PH, Landman M, Liles DC, Green MJ. Substitution reactions of tetrahydrofuran in [Cr(thf)3Cl3] with mono and bidentate N-donor ligands: X-ray crystal structures of [Cr(bipy)(OH2)Cl3] and [HpyNH2][Cr(bipy)Cl4]. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.01.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kowalczyk I. Synthesis, molecular structure and spectral properties of quaternary ammonium derivatives of 1,1-dimethyl-1,3-propylenediamine. Molecules 2008; 13:379-90. [PMID: 18305425 PMCID: PMC6245443 DOI: 10.3390/molecules13020379] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 02/12/2008] [Accepted: 02/12/2008] [Indexed: 11/16/2022] Open
Abstract
1,1-Dimethyl-3-oxo-1,4-diazepan-1-ium chloride (1) and 1,1-dimethyl-1-carboxymethyl-3-aminopropyl ammonium hydrochloride (2) have been obtained by the reactions of 1,1-dimethyl-1,3-propylenediamine with ethyl chloroacetate and chloroacetic acid, respectively. The products have been characterized by FTIR, Raman and NMR spectroscopy. B3LYP calculations have also been carried out. The screening constants for (13)C- and (1)H- atoms have been calculated by the GIAO/B3LYP/6-31G(d,p) approach and analyzed. The FTIR and NMR spectra of the investigated compounds 1 and 2 are in excellent agreement with the structures optimized by Density Functional Theory (DFT) calculations.
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Affiliation(s)
- Iwona Kowalczyk
- Laboratory of Microbiocides Chemistry, Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland.
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Ivanova BB, Mayer-Figge H. Crystal structure and solid state IR-LD analysis of a mononuclear Cu(II) complex of 4-aminopyridine. J COORD CHEM 2006. [DOI: 10.1080/00958970412331336295] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | - Heike Mayer-Figge
- b Ruhr University Bochum, Department Chemistry , 44780 Bochum, Germany
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Szafran M, Kowalczyk I, Katrusiak A. Crystal and molecular structure of 3-(2-amino-pyridinium)-propionate monohydrate. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2005.10.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ivanova B, Arnaudov M, Mayer-Figge H. Molecular spectral analysis and crystal structure of the 4-aminopyridinium tetrachloropalladate(II) complex salt. Polyhedron 2005. [DOI: 10.1016/j.poly.2005.04.028] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
AbstractThe IR-spectra of 4-aminopyridine (4-AP) in solution and in the solid state have been analyzed, using the reducing-difference procedure. Defining a more precise band assignment of a part of the characteristic frequencies of 4-AP, the data obtained proved in particular a Fermi-resonance splitting of the symmetric NH2-stretch.
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