1
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Wang L, Su X, Xie JH, Ming LJ. Specific recognitions of multivalent cyclotriphosphazene derivatives in sensing, imaging, theranostics, and biomimetic catalysis. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214326] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Papo T, Jaganyi D, Mambanda A. The effect of the chelate ligand on the rate of chloride substitution from Pt(II) complexes with picolyl and isoquinolinylcarboxamide moieties on the non-leaving ligand. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2019.119180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Miao Q, Liu WM, Kock T, Blok A, Timmer M, Overhand M, Ubbink M. A Double-Armed, Hydrophilic Transition Metal Complex as a Paramagnetic NMR Probe. Angew Chem Int Ed Engl 2019; 58:13093-13100. [PMID: 31314159 PMCID: PMC6771572 DOI: 10.1002/anie.201906049] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 07/15/2019] [Indexed: 01/20/2023]
Abstract
Synthetic metal complexes can be used as paramagnetic probes for the study of proteins and protein complexes. Herein, two transition metal NMR probes (TraNPs) are reported. TraNPs are attached through two arms to a protein to generate a pseudocontact shift (PCS) using cobalt(II), or paramagnetic relaxation enhancement (PRE) with manganese(II). The PCS analysis of TraNPs attached to three different proteins shows that the size of the anisotropic component of the magnetic susceptibility depends on the probe surroundings at the surface of the protein, contrary to what is observed for lanthanoid‐based probes. The observed PCS are relatively small, making cobalt‐based probes suitable for localized studies, such as of an active site. The obtained PREs are stronger than those obtained with nitroxide spin labels and the possibility to generate both PCS and PRE offers advantages. The properties of TraNPs in comparison with other cobalt‐based probes are discussed.
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Affiliation(s)
- Qing Miao
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Wei-Min Liu
- Department of Chemistry, Fu Jen Catholic University, No. 510, Zhongzheng Rd., Xinzhuang Dist., New, Taipei City, 24205, Taiwan
| | - Thomas Kock
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Anneloes Blok
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Monika Timmer
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Mark Overhand
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Marcellus Ubbink
- Gorlaeus Laboratories, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
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4
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Miao Q, Liu W, Kock T, Blok A, Timmer M, Overhand M, Ubbink M. A Double‐Armed, Hydrophilic Transition Metal Complex as a Paramagnetic NMR Probe. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Qing Miao
- Gorlaeus Laboratories Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Wei‐Min Liu
- Department of Chemistry Fu Jen Catholic University No. 510, Zhongzheng Rd., Xinzhuang Dist., New Taipei City 24205 Taiwan
| | - Thomas Kock
- Gorlaeus Laboratories Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Anneloes Blok
- Gorlaeus Laboratories Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Monika Timmer
- Gorlaeus Laboratories Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Mark Overhand
- Gorlaeus Laboratories Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Marcellus Ubbink
- Gorlaeus Laboratories Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
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5
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Nikitin K, O'Gara R. Mechanisms and Beyond: Elucidation of Fluxional Dynamics by Exchange NMR Spectroscopy. Chemistry 2019; 25:4551-4589. [PMID: 30421834 DOI: 10.1002/chem.201804123] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Indexed: 12/31/2022]
Abstract
Detailed mechanistic information is crucial to our understanding of reaction pathways and selectivity. Dynamic exchange NMR techniques, in particular 2D exchange spectroscopy (EXSY) and its modifications, provide indispensable intricate information on the mechanisms of organic and inorganic reactions and other phenomena, for example, the dynamics of interfacial processes. In this Review, key results from exchange NMR studies of small molecules over the last few decades are systemised and discussed. After a brief introduction to the theory, the key types of dynamic processes are identified and fundamental examples given of intra- and intermolecular reactions, which, in turn, could involve, or not, bond-making and bond-breaking events. Following that logic, internal molecular rotation, intramolecular stereomutation and molecular recognition will first be considered because they do not typically involve bond breaking. Then, rearrangements, substitution-type reactions, cyclisations, additions and other processes affecting chemical bonds will be discussed. Finally, interfacial molecular dynamics and unexpected combinations of different types of fluxional processes will also be highlighted. How exchange NMR spectroscopy helps to identify conformational changes, coordination and molecular recognition processes as well as quantify reaction energy barriers and extract detailed mechanistic information by using reaction rate theory in conjunction with computational techniques will be shown.
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Affiliation(s)
- Kirill Nikitin
- School of Chemistry, University College Dublin, Belfield, Dublin, Ireland
| | - Ryan O'Gara
- School of Chemistry, University College Dublin, Belfield, Dublin, Ireland
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6
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Zechel S, Hager MD, Schubert S, Manners I, Schubert US. From Dendrimers to Macrocycles: 80 Years George R. Newkome-Milestones of a Gentleman Scientist. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800269] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Stefan Zechel
- Laboratory of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter; Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Martin D. Hager
- Laboratory of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter; Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
| | - Stephanie Schubert
- Jena Center for Soft Matter; Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
- Institute of Pharmacy, Department of Pharmaceutical Technology and Biopharmacy; Friedrich Schiller University Jena; Lessingstr. 8 07743 Jena Germany
| | - Ian Manners
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
| | - Ulrich S. Schubert
- Laboratory of Organic and Macromolecular Chemistry; Friedrich Schiller University Jena; Humboldtstr. 10 07743 Jena Germany
- Jena Center for Soft Matter; Friedrich Schiller University Jena; Philosophenweg 7 07743 Jena Germany
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7
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Wang L, Ye Y, Lykourinou V, Yang J, Angerhofer A, Zhao Y, Ming L. Catalytic Cooperativity, Nuclearity, and O
2
/H
2
O
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Specificity of Multi‐Copper(II) Complexes of Cyclen‐Tethered Cyclotriphosphazene Ligands in Aqueous Media. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700811] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Le Wang
- College of Chemistry and Chemical Engineering Shanghai University of Engineering Science 201620 Shanghai People's Republic of China
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
- Department of Chemistry University of South Florida 33620‐5250 Tampa FL USA
| | - Yong Ye
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
| | | | - Junliang Yang
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
| | | | - Yufen Zhao
- College of Chemistry and Molecular Engineering Zhengzhou University 450001 Zhengzhou People's Republic of China
- Department of Chemical Biology Xiamen University 361005 Xiamen People's Republic of China
| | - Li‐June Ming
- Department of Chemistry University of South Florida 33620‐5250 Tampa FL USA
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8
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Lumb I, Sran BS, Sood H, Arora DS, Hundal G. Coordination chemistry of Cu(II), Co(II), Zn(II) and Ag(I) complexes of isomeric pyridine 2- and 4-carboxamides and their biological activity evaluation. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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MONDAL BIPLAB, SEN BUDDHADEB, SARKAR SANDIPAN, ZANGRANDO ENNIO, CHATTOPADHYAY PABITRA. Synthesis, characterization, crystal structure and DNA-binding study of four cadmium(II) pyridine-carboxamide complexes. J CHEM SCI 2017. [DOI: 10.1007/s12039-016-1215-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Mondal B, Sen B, Maji A, Zangrando E, Chattopadhyay P. Synthesis, crystal structure, redox behavior and DNA-binding properties of a series of copper(II) complexes with two new carboxamide derivatives. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1082556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Biplab Mondal
- Department of Chemistry, Burdwan University, Burdwan, India
| | - Buddhadeb Sen
- Department of Chemistry, Burdwan University, Burdwan, India
| | - Abhishek Maji
- Department of Chemistry, Burdwan University, Burdwan, India
| | - Ennio Zangrando
- Department of Chemical and Pharmaceutical Sciences, Trieste, Italy
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11
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Mobin SM, Mishra V, Rai DK, Dota K, Dharmadhikari AK, Dharmadhikari JA, Mathur D, Mathur P. Varying coordination modes of amide ligand in group 12 Hg(ii) and Cd(ii) complexes: synthesis, crystal structure and nonlinear optical properties. Dalton Trans 2015; 44:1933-41. [DOI: 10.1039/c4dt02111h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of the amide ligand H2L with CdCl2 and Hg(CH3COO)2, in 1 : 1 ratio, at 298 K yield dimeric [Hg(L)]2 (1) and trimeric [Cd3(H2L)4Cl6] (2), respectively.
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Affiliation(s)
- Shaikh M. Mobin
- Discipline of Chemistry
- School of Basic Sciences
- Indian Institute of Technology Indore
- Indore 452017
- India
| | - Veenu Mishra
- Discipline of Chemistry
- School of Basic Sciences
- Indian Institute of Technology Indore
- Indore 452017
- India
| | - Dhirendra K. Rai
- Discipline of Chemistry
- School of Basic Sciences
- Indian Institute of Technology Indore
- Indore 452017
- India
| | - Krithika Dota
- Tata Institute of Fundamental Research
- Mumbai 400005
- India
| | | | | | - Deepak Mathur
- Tata Institute of Fundamental Research
- Mumbai 400005
- India
| | - Pradeep Mathur
- Discipline of Chemistry
- School of Basic Sciences
- Indian Institute of Technology Indore
- Indore 452017
- India
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12
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Meghdadi S, Mirkhani V, Kia R, Moghadam M, Tangestaninejad S, Mohammadpoor-Baltork I. Direct electrochemical synthesis of copper(II) and zinc(II) complexes of the tetradentate ligand N,N′-bis(2-pyridinecarboxamide)-2-aminobenzylamine (H2bpabza). The crystal structures of the ligand and its Cu(II) complex. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.08.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Synthesis, crystal structure and electrochemistry of cobalt(III) carboxamide complexes with amine and azide ancillary ligands. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.09.032] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Meghdadi S, Amirnasr M, Azarkamanzad Z, Schenk Joß K, Fadaee F, Amiri A, Abbasi S. Benign synthesis of the unsymmetrical ligand N-(quinolin-8-yl)pyrazine-2-carboxamide. Preparation, electrochemistry, antibacterial activity, and crystal structures of Cu(II) and Zn(II) complexes. J COORD CHEM 2013. [DOI: 10.1080/00958972.2013.867024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Soraia Meghdadi
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
| | - Mehdi Amirnasr
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
| | - Zahra Azarkamanzad
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
| | - Kurt Schenk Joß
- CCC-IPSB, École Polytechnique Fédérale de Lausanne, BSP Dorigny, Lausanne, Switzerland
| | - Farzaneh Fadaee
- Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
- CCC-IPSB, École Polytechnique Fédérale de Lausanne, BSP Dorigny, Lausanne, Switzerland
| | - Ahmad Amiri
- Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, Iran
| | - Soheila Abbasi
- Department of Biological Sciences, University of Isfahan, Isfahan, Iran
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15
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Palladium(II) and platinum(II) complexes of deprotonated N,N′-bis(2-pyridinecarboxamide)-1,2-benzene: Synthesis, structural characterization and binding interactions with DNA and BSA. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2013.04.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Wang F, Shao N, Cheng Y. Paramagnetic NMR investigation of dendrimer-based host-guest interactions. PLoS One 2013; 8:e64722. [PMID: 23762249 PMCID: PMC3677888 DOI: 10.1371/journal.pone.0064722] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 04/18/2013] [Indexed: 02/03/2023] Open
Abstract
In this study, the host-guest behavior of poly(amidoamine) (PAMAM) dendrimers bearing amine, hydroxyl, or carboxylate surface functionalities were investigated by paramagnetic NMR studies. 2,2,6,6-Tetramethylpiperidinyloxy (TEMPO) derivatives were used as paramagnetic guest molecules. The results showed that TEMPO-COOH significantly broaden the 1H NMR peaks of amine- and hydroxyl-terminated PAMAM dendrimers. In comparison, no paramagnetic relaxation enhancement (PRE) was observed between TEMPO-NH2, TEMPO-OH and the three types of PAMAM dendrimers. The PRE phenomenon observed is correlated with the encapsulation of TEMPO-COOH within dendrimer pockets. Protonation of the tertiary amine groups within PAMAM dendrimers plays an important role during this process. Interestingly, the absence of TEMPO-COOH encapsulation within carboxylate-terminated PAMAM dendrimer is observed due to the repulsion of TEMPO-COO- anion and anionic dendrimer surface. The combination of paramagnetic probes and 1H NMR linewidth analysis can be used as a powerful tool in the analysis of dendrimer-based host-guest systems.
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Affiliation(s)
- Fei Wang
- Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, People's Republic of China
| | - Naimin Shao
- Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, People's Republic of China
| | - Yiyun Cheng
- Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University, Shanghai, People's Republic of China
- Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai, People's Republic of China
- * E-mail:
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17
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Amirnasr M, Rasouli M, Mereiter K. Synthesis, crystal structures and electrochemical properties of CoIII complexes with hexadentate ligand containing thioether-amidopyridyl donor set. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2012. [DOI: 10.1007/s13738-012-0156-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Affiliation(s)
- Jingjing Hu
- CAS Key Laboratory of Soft Matter
Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, People’s
Republic of China
| | - Tongwen Xu
- CAS Key Laboratory of Soft Matter
Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, People’s
Republic of China
| | - Yiyun Cheng
- Shanghai Key Laboratory of Regulatory
Biology, School of Life Sciences, East China Normal University, Shanghai, 200241, People’s Republic of China
- Shanghai
Key Laboratory of Magnetic
Resonance, Department of Physics, East China Normal University, Shanghai, 200062, P.R.China
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19
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Özdemir N, Dayan O, Çetinkaya B, Akgül C. Concomitant polymorphism of a pyridine-2,6-dicarboxamide derivative in a single space group: experimental and molecular modeling study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 86:614-624. [PMID: 22137748 DOI: 10.1016/j.saa.2011.11.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Revised: 10/25/2011] [Accepted: 11/10/2011] [Indexed: 05/31/2023]
Abstract
The title compound, N(2),N(6)-bis{2-[(Z)-2-hydroxybenzylideneamino]phenyl}pyridine-2,6-dicarboxamide (3), has been synthesized by the reaction of 2-{(2-aminophenylimino)methyl}phenol (1) with pyridine-2,6-dicarbonyl dichloride (2), and characterized by elemental analysis, FT-IR and NMR spectroscopies and thermal analysis. Compounds 1 and 3 were evaluated for their antibacterial activities against Gram-positive and Gram-negative bacteria. The catalytic activity of 3 was also studied, and as a result, the in situ prepared three component system Ru(II)/3/KOH is shown to be an efficient catalyst for the transfer hydrogenation reaction of various ketones under mild conditions. Compound 3 has been crystallized in two polymorphic forms under the same conditions, and their crystal structures have been determined using single crystal X-ray diffraction technique. The molecular geometry, vibrational frequencies and gauge-independent atomic orbital (GIAO) (1)H and (13)C NMR chemical shift values of 3 in the ground state have been calculated using the density functional theory (DFT/B3LYP) method with the 6-31G(d) basis set, and compared with the experimental data. The results are in good agreement with experimental data. The effect of different solvents on the geometry, vibrational frequencies, total energies and dipole moments was also studied using the same method by applying the Onsager Model. There are subtle differences in the conformations and packing of the two polymorphs as a consequence of intermolecular hydrogen bonding interactions. Therefore, DFT calculations for the hydrogen bond interactions in the polymorphs were carried out using same basis set. The changes of thermodynamic properties from the monomers to 3 with the temperature ranging from 200 K to 400 K have been obtained using the statistical thermodynamic method.
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Affiliation(s)
- Namık Özdemir
- Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, 55139 Kurupelit, Samsun, Turkey.
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Turega S, Whitehead M, Hall BR, Haddow MF, Hunter CA, Ward MD. Selective guest recognition by a self-assembled paramagnetic cage complex. Chem Commun (Camb) 2012; 48:2752-4. [DOI: 10.1039/c2cc17369g] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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21
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Henderson IM, Hayward RC. Substituent effects on the stabilities of polymeric and small molecule bis-terpyridine complexes. Polym Chem 2012. [DOI: 10.1039/c2py20042b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Li L, Xu H, Shi X, Hou H, Fan Y. Pyridyldicarboxamide-based multinuclear complexes: Syntheses, structural characterizations, and magnetic properties. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.07.063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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23
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Affiliation(s)
- George R. Newkome
- Departments of Polymer Science and Chemistry, University of Akron, Akron, Ohio 44325-4717, and Department of Chemistry, Hiram College, Hiram, Ohio 44234
| | - Carol Shreiner
- Departments of Polymer Science and Chemistry, University of Akron, Akron, Ohio 44325-4717, and Department of Chemistry, Hiram College, Hiram, Ohio 44234
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24
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Benign synthesis of carboxamide ligands, H2Me2bqb and H2Me2bpb. Preparation, characterization and electrochemistry of Ni(II) complexes: The crystal structure of [NiII(Me2bqb)]. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.04.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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25
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Roberts BP, Krippner GY, Scanlon MJ, Chalmers DK. Molecular Dynamics of Variegated Polyamide Dendrimers. Macromolecules 2009. [DOI: 10.1021/ma8021579] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Benjamin P. Roberts
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, 381 Royal Parade, Parkville, Victoria 3052, Australia, and Verva Pharmaceuticals Ltd., PO Box 1069, Grovedale, Victoria 3216, Australia
| | - Guy Y. Krippner
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, 381 Royal Parade, Parkville, Victoria 3052, Australia, and Verva Pharmaceuticals Ltd., PO Box 1069, Grovedale, Victoria 3216, Australia
| | - Martin J. Scanlon
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, 381 Royal Parade, Parkville, Victoria 3052, Australia, and Verva Pharmaceuticals Ltd., PO Box 1069, Grovedale, Victoria 3216, Australia
| | - David K. Chalmers
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, 381 Royal Parade, Parkville, Victoria 3052, Australia, and Verva Pharmaceuticals Ltd., PO Box 1069, Grovedale, Victoria 3216, Australia
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Tang RR, Gu GL, Zhao Q. Synthesis of Eu(III) and Tb(III) complexes with novel pyridine dicarboxamide derivatives and their luminescence properties. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:371-376. [PMID: 18325829 DOI: 10.1016/j.saa.2007.12.047] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2007] [Revised: 12/22/2007] [Accepted: 12/27/2007] [Indexed: 05/26/2023]
Abstract
A novel ligand, N2,N6-bis[2-(3-methylpyridyl)]pyridine-2,6-dicarboxamide (L2) and the corresponding Eu(III) and Tb(III) hydrochlorate complexes have been synthesized and characterized in detail based on elemental analysis, IR and NMR. The crystal and molecular structure of the complexes was determined by X-ray crystallography. The Eu(III) and Tb(III) ions were found to coordinate to the amido nitrogen atoms and pyridine nitrogen atoms. The luminescence properties of lanthanide complexes in solid state, in different solutions and in different pH value were investigated. The result shows that Tb(III) complexes exhibit more efficient luminescence than Eu(III) complexes, and the ligand (L2) is an excellent sensitizer to Tb(III) ion.
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Affiliation(s)
- Rui-Ren Tang
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China.
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Meghdadi S, Amirnasr M, Habibi MH, Amiri A, Ghodsi V, Rohani A, Harrington RW, Clegg W. Synthesis, structure, and electrochemistry of pyridinecarboxamide cobalt(III) complexes; the effect of bridge substituents on the redox properties. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.05.031] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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28
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Lee DN, Ryu JY, Kwak H, Lee YM, Lee SH, Poong JI, Lee J, Shin W, Kim C, Kim SJ, Kim Y. Steric effect on construction of Cu(II) complexes with pyridine carboxamide ligands. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.10.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Fernández G, Sánchez L, Pérez EM, Martín N. Large exTTF-Based Dendrimers. Self-Assembly and Peripheral Cooperative Multiencapsulation of C60. J Am Chem Soc 2008; 130:10674-83. [DOI: 10.1021/ja8018498] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gustavo Fernández
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain and IMDEA-Nanociencia, E-28049 Madrid, Spain
| | - Luis Sánchez
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain and IMDEA-Nanociencia, E-28049 Madrid, Spain
| | - Emilio M. Pérez
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain and IMDEA-Nanociencia, E-28049 Madrid, Spain
| | - Nazario Martín
- Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain and IMDEA-Nanociencia, E-28049 Madrid, Spain
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Lykourinou V, Hanafy AI, da Silva GFZ, Bisht KS, Larsen RW, Livingston BT, Angerhofer A, Ming LJ. How Well Should the Active Site and the Specific Recognition Be Defined for Proficient Catalysis? – Effective and Cooperative Polyphenol/Catechol Oxidation and Oxidative DNA Cleavage by a Copper(II)-Binding and H-Bonding Copolymer. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kong X, Neubert H, Zhou T, Liu ZD, Hider RC. MALDI mass spectrometric determination of dendritic iron chelation stoichiometries and conditional affinity constants. JOURNAL OF MASS SPECTROMETRY : JMS 2008; 43:617-622. [PMID: 18286664 DOI: 10.1002/jms.1357] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The iron chelation stoichiometries of a dendritic iron(III) chelator with N(1), N(3), N(5)-trimethylbenzene-1,3,5-tricarboxamide at its core, and containing 3 identical hexadentate tris-hydroxypyridinone branches D was studied by MALDI mass spectrometry. At pH 7.2, the speciation of the system included FeD, Fe(2)D and Fe(3)D species with the respective conditional stability constants of 26.74, 26.03 and 25.36. The differences in the stepwise affinity constants arise from the statistical distribution of iron(III), and there was no evidence for cooperativity between the iron-binding sites.
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Affiliation(s)
- Xiaole Kong
- Division of Pharmaceutical Science, King's College London, UK
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Chiper M, Meier MAR, Wouters D, Hoeppener S, Fustin CA, Gohy JF, Schubert US. Supramolecular Self-Assembled Ni(II), Fe(II), and Co(II) ABA Triblock Copolymers. Macromolecules 2008. [DOI: 10.1021/ma0718954] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manuela Chiper
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute (DPI), P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Unité CMAT and CERMIN, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium; and Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany
| | - Michael A. R. Meier
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute (DPI), P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Unité CMAT and CERMIN, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium; and Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany
| | - Daan Wouters
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute (DPI), P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Unité CMAT and CERMIN, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium; and Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany
| | - Stephanie Hoeppener
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute (DPI), P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Unité CMAT and CERMIN, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium; and Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany
| | - Charles-André Fustin
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute (DPI), P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Unité CMAT and CERMIN, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium; and Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany
| | - Jean-François Gohy
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute (DPI), P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Unité CMAT and CERMIN, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium; and Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany
| | - Ulrich S. Schubert
- Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology and Dutch Polymer Institute (DPI), P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Unité CMAT and CERMIN, Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium; and Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstr. 10, D-07743 Jena, Germany
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Wang J, Djukic B, Cao J, Alberola A, Razavi FS, Pilkington M. A Novel Bis Tridentate Bipyridine Carboxamide Ligand and Its Complexation to Copper(II): Synthesis, Structure, and Magnetism. Inorg Chem 2007; 46:8560-8. [PMID: 17854169 DOI: 10.1021/ic700469v] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new bis tridentate ligand 2,2'-bipyridine-3,3'-[2-pyridinecarboxamide] H(2)L(1) which can bind transition metal ions has been synthesized via the condensation of 3,3'-diamino-2,2'-bipyridine together with 2-pyridine carbonyl chloride. Two copper(II) coordination compounds have been prepared and characterized: [Cu(2)(L(1))(hfac)(2)].3CH(3)CN.H(2)O (1) and [Cu(2)(L(1))Cl(2)].CH(3)CN (2). The single-crystal X-ray structures reveal that complex 1 crystallizes in the triclinic space group P1, with the unit cell parameters a = 12.7185(6) A, b = 17.3792(9) A, c = 19.4696(8) A, alpha = 110.827(2) degrees, beta = 99.890(3) degrees, gamma = 97.966(3) degrees, V = 3868.3(3) A3, Z = 4, R = 0.0321 and R(w) = 0.0826. Complex 2 crystallizes in the monoclinic space group P2(1)/n with the unit cell parameters a = 12.8622(12) A, b = 9.6100(10) A, c = 19.897(2) A, beta = 102.027(3) degrees, V = 2405.3(4) A(3), Z = 4, R = 0.0409 and R(w) = 0.1005. In both complexes the ligand is in the dianionic form and coordinates the divalent Cu(II) ions via one amido and two pyridine nitrogen donor atoms. In 1, the coordination geometry around both Cu(II) ions is best described as distorted trigonal bipyramidal where the remaining two coordination sites are satisfied by hexafluoroacetylacetonate counterions. In 2 both Cu(II )ions adopt a (4 + 1) distorted square pyramidal geometry. One copper forms a longer apical bond to an adjacent carbonyl oxygen atom, whereas the second copper is chelated to a neighboring Cu-Cl chloride ion to afford a mu-Cl-bridged dimerized [Cu(2)(L(1))Cl(2)](2) complex. The magnetic susceptibility data for 1 (2 -270 K), reveal the occurrence of weak antiferromagnetic interactions between the Cu(II) ions. In contrast, variable-temperature magnetic susceptibility measurements for 2 reveal more complex magnetic properties, with the presence of a weak antiferromagnetic exchange (J = -10.1 K) between the copper ions in each dinuclear copper complex and a stronger ferromagnetic exchange interaction (J = 32.9 K) between the Cu(II) ions of the Cu(mu-Cl)(2)Cu dimeric bridging units.
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Affiliation(s)
- Jian Wang
- Department of Chemistry, Brock University, 500 Glenridge Avenue, St. Catharines, Ontario, Canada L2S 3A1
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Rathgeber S, Monkenbusch M, Hedrick JL, Trollsås M, Gast AP. Starlike dendrimers in solutions: Structural properties and internal dynamics. J Chem Phys 2006; 125:204908. [PMID: 17144741 DOI: 10.1063/1.2364895] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We measured the shape and the internal dynamics of starlike dendrimers under good solvent conditions with small-angle neutron scattering and neutron spin-echo (NSE) spectroscopy, respectively. Architectural parameters such as the spacer length and generation were varied in a systematic manner. Structural changes occurring in the dendrimers as a function of these parameters are discussed, i.e., in terms of the fractal dimension and deviations of the radius of gyration from the Gaussian value. A first cumulant evaluation of the NSE spectra for each scattering vector q separately yields the length scale dependent relaxation rates. We observe a local minimum in the normalized relaxation rates Omega(q)q(3) on length scales corresponding to the overall dendrimer dimension. The dynamics is discussed within a Rouse-Zimm approach generalized to the case of starlike dendrimers of arbitrary geometry. The model allows an identification of the modes contributing to the relaxation of the dendrimer in the q and time range of the NSE experiment. The local minimum is due to collective breathing motions of (parts of) the dendrons relative to each other. Shape fluctuations are not observed.
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Affiliation(s)
- Silke Rathgeber
- Max-Planck Institut für Polymerforschung, Polymer Physik, D-55128 Mainz, Germany.
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Yamamoto K, Imaoka T. Dendrimer Complexes Based on Fine-Controlled Metal Assembling. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2006. [DOI: 10.1246/bcsj.79.511] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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36
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Gudasi KB, Vadavi RS, Shenoy RV, Patil MS, Patil SA. Ambidentate behavior of pentadentate N,N′-bis(2-hydroxyphenyl)-pyridine-2,6-dicarboxamide towards transition metal(II) salts. TRANSIT METAL CHEM 2005. [DOI: 10.1007/s11243-005-2384-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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37
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Koval IA, van der Schilden K, Schuitema AM, Gamez P, Belle C, Pierre JL, Lüken M, Krebs B, Roubeau O, Reedijk J. Proton NMR Spectroscopy and Magnetic Properties of a Solution-Stable Dicopper(II) Complex Bearing a Single μ-Hydroxo Bridge. Inorg Chem 2005; 44:4372-82. [PMID: 15934768 DOI: 10.1021/ic0501770] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of copper(II) perchlorate with the macrocyclic ligand [22]py4pz in the presence of base leads to formation of a dinuclear complex [Cu(2)([22]py4pz)(mu-OH)](ClO(4))(3)xH(2)O, in which two copper ions are bridged by a single mu-hydroxo bridge. Each copper ion is further surrounded by four nitrogen atoms of the ligand. The mu-hydroxo bridge mediates a strong antiferromagnetic coupling (2J = -691(35) cm(-1)) between the metal centers, leading to relatively sharp and well-resolved resonances in the (1)H NMR spectrum of the complex in solution. We herein report the crystal structure, the magnetic properties, and the full assignment of the hyperfine-shifted resonances in the NMR spectrum of the complex, as well as the determination of the exchange coupling constant in solution through temperature-dependent NMR studies.
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Affiliation(s)
- Iryna A Koval
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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38
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Li WS, Jiang DL, Suna Y, Aida T. Cooperativity in Chiroptical Sensing with Dendritic Zinc Porphyrins. J Am Chem Soc 2005; 127:7700-2. [PMID: 15913359 DOI: 10.1021/ja0513335] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Zinc porphyrin-appended dendrimers, 12PZn, 18PZn, 24PZn, and 36PZn, containing 12, 18, 24, and 36 zinc porphyrin units, respectively, were synthesized using zinc porphyrin dyad (2PZn) and triad (3PZn) as precursors. Although these dye-functionalized dendrimers all serve as chiroptical sensors for an asymmetric bipyridine (RR- and SS-Py2), the sensing capability is highly dependent on the structure of the dendritic scaffold. 2PZn, which is chiroptically silent toward Py2, turns cooperative and displays a large ICD (induced circular dichroism) response in the visible region when incorporated into 12PZn. Judging from the extents of contribution of each zinc porphyrin unit to the CD amplitudes ([Deltaepsilonmax]), the cooperativity in 24PZn (112 M-1 cm-1) is lower than that in 12PZn (196 M-1 cm-1) and much lower in dendron 4PZn (59 M-1 cm-1). In contrast, 3PZn, which is ICD-active toward Py2, hardly shows such an enhanced cooperativity when incorporated into 18PZn and 36PZn and dendron 6PZn, as well. Absorption spectroscopy suggests some unique conformational characteristics of the zinc porphyrin units in highly cooperative 12PZn.
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Affiliation(s)
- Wei-Shi Li
- Aida Nanospace Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), 2-41 Aomi, Koto-ku, Tokyo, 135-0064 Japan
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Welch KT, Arévalo S, Turner JFC, Gómez R. An NMR and Molecular Modeling Study of Carbosilane-Based Dendrimers Functionalized with Phenolic Groups or Titanium Complexes at the Periphery. Chemistry 2005; 11:1217-27. [PMID: 15645417 DOI: 10.1002/chem.200400689] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Dendrimers are modified polymers whose architecture is defined by the presence of a central atom or core with multiple branches. These molecules lend themselves to a variety of architectures and uses, including drug delivery and catalysis. The study of the molecular conformations and shapes of dendritic molecules is necessary but not yet routine. Here we present an NMR and molecular modeling study of a series of carbosilane dendrimers, namely 1G-{(CH2)3[C6H3(OMe)]OH}4 (1), 2G-{(CH2)3[C6H3(OMe)]OH}8 (2), and 2G-{(CH2)3[C6H3(OMe)]O[Ti(C5H5)Cl2]}8 (3). Various two-dimensional NMR techniques were used to completely assign the 1H and 13C resonances of molecules 1-3. This information was used, in conjunction with 1H and 13C spin-lattice relaxation measurements, to assess the chain motion of the molecules. The NMR data were also compared with 1-ns molecular dynamics (MD) simulations of 1 and 2 using the MMFF94 force field. The results indicate that these dendrimers possess a core that is motionally decoupled from the rest of the dendrimer, with flexible arm segments that extend from the core. The addition of eight functionalized titanium groups to the ends of the dendrimer chains of 2 to yield molecule 3 serves to further restrict chain motion.
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Affiliation(s)
- Karen T Welch
- Department of Chemistry, 409 Buehler Hall, University of Tennessee, Knoxville Tennessee 37996-1600, USA
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40
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Syntheses and nickel coordination properties of cyclen substituted with mixed stilbene/poly(ethylene glycol) dendritic arms. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pola.20960] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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Huang B, Prantil MA, Gustafson TL, Parquette JR. The Effect of Global Compaction on the Local Secondary Structure of Folded Dendrimers. J Am Chem Soc 2003; 125:14518-30. [PMID: 14624601 DOI: 10.1021/ja037895a] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of nonlocal interactions on the local structural propensities of folded dendrimers was evaluated in this work by comparing, under identical conditions, the conformational properties of isomeric dendrimers differing in their global packing efficiency. Accordingly, a modular synthesis of two series of dendrimers up to the third generation was developed to provide efficient access to isomeric dendrimers displaying different levels of overall compaction. Dendrimer compaction levels were adjusted by connecting the folded dendrons to 1,3,5-benzenetricarbonyl chloride, as the central core, via either a 2- or a 4-aminobenzamide linkage to induce relatively "compacted" or "expanded" conformations, respectively. The hydrodynamic volumes of the dendrimers were measured by time-resolved fluorescence anisotropy (TRFA) measurements as a function of the dendrimer series, generation level, and solvent. Packing efficiencies (compaction levels) were estimated by the ratio (V(h)/V(vw)) of the experimental hydrodynamic volume (V(h)) to the calculated van der Waals volume (V(vw)). The extent and stability of local helical bias was measured using circular dichroism and correlated with the packing efficiency (V(h)/V(vw)). These studies suggested that compaction plays an extremely important role in determining the secondary structural preferences of the dendrimers; however, the nature of compaction was more important than the extent of compaction.
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Affiliation(s)
- Baohua Huang
- Department of Chemistry, The Ohio State University, Columbus, OH 43210, USA
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42
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Malveau C, Baille WE, Zhu XX, Ford WT. Molecular dynamics of hydrophilic poly(propylene imine) dendrimers in aqueous solutions by1H NMR relaxation. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/polb.10584] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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43
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Unimolecular micelles: supramolecular use of dendritic constructs to create versatile molecular containers. CR CHIM 2003. [DOI: 10.1016/j.crci.2003.04.002] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Gelis I, Katsaros N, Luchinat C, Piccioli M, Poggi L. A simple protocol to study blue copper proteins by NMR. EUROPEAN JOURNAL OF BIOCHEMISTRY 2003; 270:600-9. [PMID: 12581200 DOI: 10.1046/j.1432-1033.2003.03400.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In the case of oxidized plastocyanin from Synechocystis sp. PCC6803, an NMR approach based on classical two and three dimensional experiments for sequential assignment leaves unobserved 14 out of 98 amino acids. A protocol which simply makes use of tailored versions of 2D HSQC and 3D CBCA(CO)NH and CBCANH leads to the identification of nine of the above 14 residues. The proposed protocol differs from previous approaches in that it does not involve the use of unconventional experiments designed specifically for paramagnetic systems, and does not exploit the occurrence of a corresponding diamagnetic species in chemical exchange with the blue copper form. This protocol is expected to extend the popularity of NMR in the structural studies of copper (II) proteins, allowing researchers to increase the amount of information available via NMR on the neighborhood of a paramagnetic center without requiring a specific expertise in the field. The resulting 3D spectra are standard spectra that can be handled by any standard software for protein NMR data analysis.
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Affiliation(s)
- Ioannis Gelis
- NCSR Demokritos, Institute of Physical Chemistry, Agia Paraskevi Attikis, Greece
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45
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Imaoka T, Horiguchi H, Yamamoto K. Metal assembly in novel dendrimers with porphyrin cores. J Am Chem Soc 2003; 125:340-1. [PMID: 12517139 DOI: 10.1021/ja0285060] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of phenylazozmethine (DPA) dendrimers with a porphyrin core (PnH2) were synthesized by dehydration using TiCl4 from meso-tetrakis(4-aminophenyl)porphyrin and the DPA dendrons. The addition of SnCl2 to a dichloromethane/acetonitrile solution of dendritic cobalt porphyrin resulted in a stepwise spectral change. By using UV-vis spectroscopy to monitor the complexation of the P4CoIIICl until an equimolar amount of SnCl2 has been added, four changes in the position of the isosbestic point were observed during the addition of SnCl2. Titration results suggest that four different complexes are successively formed upon the SnCl2 addition and that the complexation proceeds in, not a random, but a stepwise fashion from the core imines to the terminal imines of P4CoIIICl. The electrochemical study reveals that their dendrimers with Tb ion act as a multielectron mediator in CO2 reduction at high applied potential on the electrode.
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Affiliation(s)
- Takane Imaoka
- Kanagawa Academy of Science & Technology (KAST), Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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