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Ichimaru Y, Kato K, Nakatani R, Isomura R, Sugiura K, Yamaguchi Y, Jin W, Mizutani H, Imai M, Kurihara M, Fujita M, Otsuka M, Kurosaki H. Structural Characterization of Zinc(II)/Cobalt(II) Complexes of Chiral N-(Anthracen-9-yl)methyl-N,N-bis(2-picolyl)amine and Evaluation of DNA Photocleavage Activity. Chem Pharm Bull (Tokyo) 2023; 71:545-551. [PMID: 37394603 DOI: 10.1248/cpb.c23-00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
We designed and synthesized a chiral ligand N-(anthracen-9-ylmethyl)-1-(pyridin-2-yl)-N-(pyridin-2-ylmethyl)ethanamine (APPE) DNA photocleavage agent to investigate the effects of chirality of bis(2-picolyl)amine on the DNA photocleavage activity of metal complexes. The structures of ZnII and CoII complexes in APPE were analyzed via X-ray crystallography and fluorometric titration. APPE formed metal complexes with a 1 : 1 stoichiometry in both the crystalline and solution states. Fluorometric titration was used to show that the ZnII and CoII association constants of these complexes (log Kas) were 4.95 and 5.39, respectively. The synthesized complexes were found to cleave pUC19 plasmid DNA when irradiated at 370 nm. The DNA photocleavage activity of the ZnII complex was higher than that of the CoII complex. The absolute configuration of the methyl-attached carbon did not affect DNA cleavage activity and, unfortunately, an achiral APPE derivative without the methyl group (ABPM) was found to perform DNA photocleavage more effectively than APPE. One reason for this may be that the methyl group suppressed the structural flexibility of the photosensitizer. These results will be useful for the design of new photoreactive reagents.
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Affiliation(s)
- Yoshimi Ichimaru
- Faculty of Pharmaceutical Sciences, Shonan University of Medical Sciences
| | - Koichi Kato
- Faculty of Pharmaceutical Sciences, Shonan University of Medical Sciences
| | | | | | | | | | - Wanchun Jin
- College of Pharmacy, Kinjo Gakuin University
| | | | | | - Masaaki Kurihara
- Faculty of Pharmaceutical Sciences, Shonan University of Medical Sciences
| | - Mikako Fujita
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University
| | - Masami Otsuka
- Medicinal and Biological Chemistry Science Farm Joint Research Laboratory, Faculty of Life Sciences, Kumamoto University
- Department of Drug Discovery, Science Farm Ltd
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2
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Ramzy E, Ibrahim MM, El-Mehasseb IM, Ramadan AEMM, Elshami FI, Shaban SY, van Eldik R. Synthesis, Biophysical Interaction of DNA/BSA, Equilibrium and Stopped-Flow Kinetic Studies, and Biological Evaluation of bis(2-Picolyl)amine-Based Nickel(II) Complex. Biomimetics (Basel) 2022; 7:172. [PMID: 36412701 PMCID: PMC9680484 DOI: 10.3390/biomimetics7040172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/17/2022] [Accepted: 10/19/2022] [Indexed: 12/14/2022] Open
Abstract
Reaction of bis(2-picolyl)amine (BPA) with Ni(II) salt yielded [(BPA)NiCl2(H2O)] (NiBPA). The Ni(II) in NiBPA bound to a BPA ligand, two chloride, and one aqua ligands. Because most medications inhibit biological processes by binding to a specific protein, the stopped-flow technique was used to investigate DNA/protein binding in-vitro, and a mechanism was proposed. NiBPA binds to DNA/protein more strongly than BPA via a static quenching mechanism. Using the stopped-flow technique, a mechanism was proposed. BSA interacts with BPA via a fast reversible step followed by a slow irreversible step, whereas NiBPA interacts via two reversible steps. DNA, on the other hand, binds to BPA and NiBPA via the same mechanism through two reversible steps. Although BSA interacts with NiBPA much faster, NiBPA has a much higher affinity for DNA (2077 M) than BSA (30.3 M). Compared to NiBPA, BPA was found to form a more stable BSA complex. When BPA and NiBPA bind to DNA, the Ni(II) center was found to influence the rate but not the mechanism, whereas, for BSA, the Ni(II) center was found to change both the mechanism and the rate. Additionally, NiBPA exhibited significant cytotoxicity and antibacterial activity, which is consistent with the binding constants but not the kinetic stability. This shows that in our situation, biological activity is significantly more influenced by binding constants than by kinetic stability. Due to its selectivity and cytotoxic activity, complex NiBPA is anticipated to be used in medicine.
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Affiliation(s)
- Esraa Ramzy
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Mohamed M. Ibrahim
- Chemistry Department, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Ibrahim M. El-Mehasseb
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | | | - Fawzia I. Elshami
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Rudi van Eldik
- Chemistry Department, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
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3
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Kubono K, Kashiwagi Y, Tani K, Yokoi K. Crystal structure of (7-{[bis-(pyridin-2-ylmeth-yl)amino-κ 3 N, N', N'']meth-yl}-5-chloro-quinolin-8-ol)di-bromidozinc(II). Acta Crystallogr E Crystallogr Commun 2022; 78:326-329. [PMID: 35371540 PMCID: PMC8900503 DOI: 10.1107/s2056989022001530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/09/2022] [Indexed: 11/13/2022]
Abstract
In the title compound, [ZnBr2(C22H19ClN4O)], the ZnII atom adopts a distorted square-pyramidal coordination geometry, formed by two bromido ligands and three N atoms of the bis-(pyridin-2-ylmeth-yl)amine moiety in the penta-dentate ligand containing quinolinol. The ZnII atom is located well above the mean basal plane of the square-based pyramid. The apical position is occupied by a Br atom. The O and N atoms of the quinolinol moiety in the ligand are not coordinated to the ZnII atom. An intra-molecular O-H⋯N hydrogen bond, generating an S(5) ring motif, stabilizes the mol-ecular structure. In the crystal, the mol-ecules are linked by inter-molecular C-H⋯Br hydrogen bonds, generating ribbon structures containing alternating R 2 2(22) and R 2 2(14) rings. These ribbons are linked through an inter-molecular C-H⋯Br hydrogen bond, forming a two-dimensional network sheet.
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Affiliation(s)
- Koji Kubono
- Osaka Kyoiku University, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
| | - Yukiyasu Kashiwagi
- Osaka Research Institute of Industrial Science and Technology, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553, Japan
| | - Keita Tani
- Osaka Kyoiku University, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
| | - Kunihiko Yokoi
- Osaka Kyoiku University, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan
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4
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Pantalon Juraj N, Tandarić T, Tadić V, Perić B, Moreth D, Schatzschneider U, Brozovic A, Vianello R, Kirin SI. Tuning the coordination properties of chiral pseudopeptide bis(2-picolyl)amine and iminodiacetamide ligands in Zn( ii) and Cu( ii) complexes. Dalton Trans 2022; 51:17008-17021. [DOI: 10.1039/d2dt02895f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Modifications of the chiral side chains of bpa and imda ligands lead to different metal ion coordination and hydrogen bonding ability.
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Affiliation(s)
| | | | | | | | - Dominik Moreth
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Ulrich Schatzschneider
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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5
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Pantalon Juraj N, Kirin SI. Inorganic stereochemistry: Geometric isomerism in bis-tridentate ligand complexes. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214051] [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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Min S, Chae H, Jeong HJ, Kim K, Namgoong SK, Jeong K. Optimization of signal amplification by reversible exchange for polarization of tridentate chelating bis[(2-pyridyl)alkyl]amine. Analyst 2021; 146:2368-2373. [PMID: 33634298 DOI: 10.1039/d0an02372h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Signal amplification by reversible exchange (SABRE) is an effective NMR hyperpolarization technique for signal enhancement using para-hydrogen on iridium catalysts. To date, monodentate chelating nitrogen analogs have been predominantly used as substrates for SABRE because of the limited chelating sites of the Ir-catalyst with different molecular orientations. Herein, for the first time, the use of a tridentate chelating ligand (BPEA) containing pyridine moieties and a secondary amine as a SABRE substrate is demonstrated. For the optimization of the tridentate chelating ligand, alkyl chain lengths were varied with the optimization of the external magnetic field and concentrations of three different ligands. Because many chemically multidentate complexes present in nature have scarcely been studied as SABRE substrates, this optimized tridentate chelating ligand structure with the SABRE catalyst and its polarization transfer from para-hydrogen will broaden the scope of hyperpolarizable substrates and help in the investigation of chelating structures for future applications.
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Affiliation(s)
- Sein Min
- Department of Chemistry, Seoul Women's University, Seoul 01797, South Korea.
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7
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Sánchez-Férez F, Rius-Bartra JM, Calvet T, Font-Bardia M, Pons J. Steric and Electronic Effects on the Structure and Photophysical Properties of Hg(II) Complexes. Inorg Chem 2021; 60:3851-3870. [PMID: 33629838 PMCID: PMC8483444 DOI: 10.1021/acs.inorgchem.0c03640] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Since many factors influence the
coordination around a metal center,
steric and electronic effects of the ligands mainly determine the
connectivity and, thus, the final arrangement. This is emphasized
on Hg(II) centers, which have a zero point stabilization energy and,
thus, a flexible coordination environment. Therefore, the unrestricted
Hg(II) geometry facilitates the predominance of the ligands during
the structural inception. Herein, we synthesized and characterized
a series of six Hg(II) complexes with general formula (Hg(Pip)2(dPy)) (Pip = piperonylate, dPy = 3-phenylpyridine (3-phpy)
(1), 4-phenylpyridine (4-phpy) (2), 2,2′-bipyridine
(2,2′-bipy) (3), 1,10-phenanthroline (1,10-phen)
(4), 2,2′:6′,2′-terpyridine (terpy)
(5), or di(2-picolyl)amine (dpa) (6)). The
elucidation of their crystal structures revealed the arrangement of
three monomers (3, 5, and 6), one dimer (4), and two coordination polymers (1 and 2) depending on the steric requirements
of the dPy and predominance of the ligands. Besides, the study of
their photophysical properties in solution supported by TD-DFT calculations
enabled us to understand their electronic effects and the influence
of the structural arrangement on them. Six Hg(II)
complexes containing 1,3-benzodioxole-5-carboxylic
acid and pyridine derivatives bearing N-, N^N′-, and N^N^N-donor sites have been characterized
and their crystal structure elucidated. Steric crowding defined the
predominance of the linkers in the structural arrangement, varying
from monomers to coordination polymers. Their photophysical properties
were analyzed through experimental and TD-DFT calculations, identifying
the character and regions involved on each electronic transition.
In addition, seclusion of the HOMO from the LUMO defined them as appropriate
to selective band gap tuning.
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Affiliation(s)
- Francisco Sánchez-Férez
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Joaquim Ma Rius-Bartra
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Teresa Calvet
- Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain
| | - Mercè Font-Bardia
- Unitat de Difracció de Raig-X, Centres Científics i Tecnològics de la Universitat de Barcelona (CCiTUB), Universitat de Barcelona, Solé i Sabarís, 1-3, 08028 Barcelona, Spain
| | - Josefina Pons
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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8
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Pantalon Juraj N, Krklec M, Novosel T, Perić B, Vianello R, Raić-Malić S, Kirin SI. Copper(ii) and zinc(ii) complexes of mono- and bis-1,2,3-triazole-substituted heterocyclic ligands. Dalton Trans 2020; 49:9002-9015. [PMID: 32558875 DOI: 10.1039/d0dt01244k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Chelating 1,4-disubstituted mono- (8a-8d) and bis-1,2,3-triazole-based (9a-11a) ligands were prepared by regioselective copper(i)-catalysed 1,3-dipolar cycloaddition of terminal alkynes with aromatic azides, together with bioconjugate 13a synthesized by amide coupling of l-phenylalanine methyl ester to 11a. Cu(ii) and Zn(ii) complexes were prepared and single crystal structures were determined for complexes 8aCu, 8dCu, 9cCu and 10cCu, as well as the free ligands 10a and 10c. The in situ prepared Zn(ii) complexes were studied by NMR spectroscopy, while the stoichiometry of the Cu(ii) complexes in solution was determined by UV-Vis titrations and confirmed by the electronic structure DFT calculations at the (SMD)/M05-2X/6-31+G(d)/LanL2DZ+ECP level of theory.
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9
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Bispicolyamine-Based Supramolecular Polymeric Gels Induced by Distinct Different Driving Forces with and Without Zn 2. Int J Mol Sci 2020; 21:ijms21134617. [PMID: 32610553 PMCID: PMC7369882 DOI: 10.3390/ijms21134617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/24/2020] [Accepted: 06/26/2020] [Indexed: 01/04/2023] Open
Abstract
Metal-coordination polymeric gels are interesting areas as organic/inorganic hybrid supramolecular materials. The bispicolylamine (BPA) based gelator (1) showed excellent gelation with typical fibrillar morphology in acetonitrile. Upon complexing 1 with Zn2+, complexes ([1 + Zn + ACN]2+ and [1 + zinc trifluoromethanesulfonate (ZnOTf)]+) with four coordination numbers were formed, which determine the gel structure significantly. A gel-sol transition was induced, driven by the ratio of the two metal complexes produced. Through nuclear magnetic resonance analysis, the driving forces in the gel formation (i.e., hydrogen-bonding and π-π stacking) were observed in detail. In the absence and the presence of Zn2+, the intermolecular hydrogen-bonds and π-π stacking were the primary driving forces in the gel formation, respectively. In addition, the supramolecular gels exhibited a monolayer lamellar structure irrespective of Zn2+. Conclusively, the gels' elasticity and viscosity reduced in the presence of Zn2+.
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10
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Doiuchi D, Nakamura T, Hayashi H, Uchida T. Non‐Heme‐Type Ruthenium Catalyzed Chemo‐ and Site‐Selective C−H Oxidation. Chem Asian J 2020; 15:762-765. [DOI: 10.1002/asia.202000134] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 02/17/2020] [Indexed: 01/17/2023]
Affiliation(s)
- Daiki Doiuchi
- Department of Chemistry Graduate School of ScienceKyushu University 744, Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Tatsuya Nakamura
- Department of Chemistry Graduate School of ScienceKyushu University 744, Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Hiroki Hayashi
- Faculty of Arts and ScienceKyushu University 744, Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Tatsuya Uchida
- Faculty of Arts and ScienceKyushu University 744, Motooka, Nishi-ku Fukuoka 819-0395 Japan
- International Institute for Carbon-Neutral Energy Research (WPI−I2CNER)Kyushu University 744, Motooka, Nishi-ku Fukuoka 819-0395 Japan
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11
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Pantalon Juraj N, Miletić GI, Perić B, Popović Z, Smrečki N, Vianello R, Kirin SI. Stereochemistry of Hexacoordinated Zn(II), Cu(II), Ni(II), and Co(II) Complexes with Iminodiacetamide Ligands. Inorg Chem 2019; 58:16445-16457. [PMID: 31774277 DOI: 10.1021/acs.inorgchem.9b02200] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Metal complexes of iminodiacetamide (imda) ligands and metal ions Zn(II), Cu(II), Ni(II), and Co(II) were prepared using eight imda ligands (L1-L8) substituted with groups of different steric and electronic properties on the central amine N atom (H atom, methyl, isopropyl, and benzyl) and the para position of the phenyl rings (nitro and dimethylamino). The effect of these substituents on the stoichiometry (ML and ML2), geometry, and stereochemistry (mer, trans-fac, cis-fac) of the complexes was studied in the solid state, in solution, and by density functional theory calculations. Single-crystal and powder X-ray diffraction, thermogravimetry, and IR spectroscopy showed that in the solid state imda ligands preferentially form trans-fac ML2 complexes, with the exception of the cis-fac complex 7Zn. NMR spectroscopy of diamagnetic Zn(II) and paramagnetic Co(II) complexes revealed the formation of both ML and ML2 complexes in solution, which was also confirmed by UV-vis titrations. Variable-temperature NMR was used to study the effect of the substituent on the central amine N atom on the Zn-N bond strength and nitrogen inversion. The relative stabilities of the isomers were rationalized by computations and the optimized structures used for geometry analysis.
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Affiliation(s)
| | - Goran I Miletić
- Ruđer Bošković Institute , Bijenička c. 54 , HR-10000 Zagreb , Croatia
| | - Berislav Perić
- Ruđer Bošković Institute , Bijenička c. 54 , HR-10000 Zagreb , Croatia
| | - Zora Popović
- Department of Chemistry, Faculty of Science , University of Zagreb , Horvatovac 102a , HR-10000 Zagreb , Croatia
| | - Neven Smrečki
- Department of Chemistry, Faculty of Science , University of Zagreb , Horvatovac 102a , HR-10000 Zagreb , Croatia
| | - Robert Vianello
- Ruđer Bošković Institute , Bijenička c. 54 , HR-10000 Zagreb , Croatia
| | - Srećko I Kirin
- Ruđer Bošković Institute , Bijenička c. 54 , HR-10000 Zagreb , Croatia
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12
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Fujiwara S, Nonaka K, Yamaguchi M, Hashimoto T, Hayashita T. Structural effects of ditopic azoprobe–cyclodextrin complexes on the selectivity of guest-induced supramolecular chirality. Chem Commun (Camb) 2018; 54:12690-12693. [DOI: 10.1039/c8cc02242a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Guest-induced supramolecular chirality: the guest ion selectivity was dramatically altered by a slight change in the spacer length of (15C5-Azo-n-dpa)2–γ-CyD complexes in water.
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Affiliation(s)
- Shoji Fujiwara
- Department of Current Legal Studies
- Faculty of Law
- Meiji Gakuin University
- Yokohama
- Japan
| | - Kentaro Nonaka
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Mai Yamaguchi
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Takeshi Hashimoto
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
| | - Takashi Hayashita
- Department of Materials and Life Sciences
- Faculty of Science and Technology
- Sophia University
- Tokyo 102-8554
- Japan
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13
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Dabić D, Brkljačić L, Tandarić T, Žinić M, Vianello R, Frkanec L, Kobetić R. The Metal Effect on Self-Assembling of Oxalamide Gelators Explored by Mass Spectrometry and DFT Calculations. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2018; 29:103-113. [PMID: 29086338 DOI: 10.1007/s13361-017-1834-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 10/02/2017] [Accepted: 10/10/2017] [Indexed: 06/07/2023]
Abstract
Gels formed by self-assembly of small organic molecules are of wide interest as dynamic soft materials with numerous possible applications, especially in terms of nanotechnology for functional and responsive biomaterials, biosensors, and nanowires. Four bis-oxalamides were chosen to show if electrospray ionization mass spectrometry (ESI-MS) could be used as a prediction of a good gelator and also to shed light on the gelation processes. By inspecting the gelation of several solvent, we showed that bis(amino acid)oxalamide 1 proved to be the most efficient, also being able of forming the largest observable assemblies in the gas phase. The formation of singly charged assemblies holding from one up to six monomer units is the outcome of the strong intermolecular H-bonds, particularly among terminal carboxyl groups. The variation of solvents from polar aprotic towards polar protic did not have any significant effects on the size of the assemblies. The addition of a salt such as NaOAc or Mg(OAc)2, depending on the concentration, altered the assembling. Computational analysis at the DFT level aided in the interpretation of the observed trends and revealed that individual gelator molecules spontaneously assemble to higher aggregates, but the presence of the Na+ cation disrupts any gelator organization since it becomes significantly more favorable for gelator molecules to bind Na+ cations up to the 3:1 ratio than to self-assemble, being fully in line with experimental observations reported here. Graphical Abstract ᅟ.
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Affiliation(s)
- Dario Dabić
- Department of Analytical Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000, Zagreb, Croatia
| | - Lidija Brkljačić
- Laboratory for Carbohydrate, Peptide and Glycopeptide Research, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - Tana Tandarić
- Computational Organic Chemistry and Biochemistry Group, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - Mladen Žinić
- Laboratory of Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia
| | - Robert Vianello
- Computational Organic Chemistry and Biochemistry Group, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia.
| | - Leo Frkanec
- Laboratory of Supramolecular Chemistry, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia.
| | - Renata Kobetić
- Laboratory for Biomolecular Interactions and Spectroscopy, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000, Zagreb, Croatia.
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14
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Kokan Z, Perić B, Kovačević G, Brozovic A, Metzler-Nolte N, Kirin SI. cis
- versus trans
-Square-Planar Palladium(II) and Platinum(II) Complexes with Triphenylphosphine Amino Acid Bioconjugates. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700679] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Zoran Kokan
- Ruđer Bošković Institute; Bijenička 54 10000 Zagreb Croatia
| | - Berislav Perić
- Ruđer Bošković Institute; Bijenička 54 10000 Zagreb Croatia
| | | | | | - Nils Metzler-Nolte
- Faculty of Chemistry and Biochemistry; Ruhr University Bochum; Universitätsstraße 150 44801 Bochum Germany
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15
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Gorla L, Martí-Centelles V, Freimuth L, Altava B, Burguete MI, Luis SV. Cu(2+), Zn(2+), and Ni(2+) Complexes of C2-Symmetric Pseudopeptides with an Aromatic Central Spacer. Inorg Chem 2016; 55:7617-29. [PMID: 27438410 DOI: 10.1021/acs.inorgchem.6b01066] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Two new tetradentate C2-symmetric pseudopeptidic ligands derived from Val and Phe containing two amino and two amido groups and a central o-substituted aromatic spacer have been prepared. Their complexes with Cu(2+), Zn(2+), and Ni(2+) have been studied by potentiometry, UV-vis spectrophotometry, FT-IR, and ESI-MS. The presence of the aromatic spacer provides Cu(2+) complexes with stability constants several orders of magnitude higher than those observed for related ligands containing aliphatic central spacers. Besides, the formation of [MH-2L] complex species is favored. Crystal structures for the corresponding Cu(2+) and Ni(2+) have been obtained, revealing the metal atom in an essentially square-planar geometry, although, in several instances, the oxygen atom of an amide carbonyl of a second complex species can act as a fifth coordination site. In the case of Zn(2+), the only crystal structure obtained displays a square-pyramidal arrangement of the metal center. Finally, preliminary experiments show the catalytic activity of some of these complexes, in particular, Zn(2+) complexes, for epoxide ring-opening with using aniline as the nucleophile in a ligand accelerated process.
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Affiliation(s)
- Lingaraju Gorla
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I , Av. de Vicent Sos Baynat, s/n, 12071, Castellón, Spain
| | - Vicente Martí-Centelles
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I , Av. de Vicent Sos Baynat, s/n, 12071, Castellón, Spain
| | - Lena Freimuth
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I , Av. de Vicent Sos Baynat, s/n, 12071, Castellón, Spain
| | - Belén Altava
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I , Av. de Vicent Sos Baynat, s/n, 12071, Castellón, Spain
| | - M Isabel Burguete
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I , Av. de Vicent Sos Baynat, s/n, 12071, Castellón, Spain
| | - Santiago V Luis
- Departamento de Química Inorgánica y Orgánica, Universitat Jaume I , Av. de Vicent Sos Baynat, s/n, 12071, Castellón, Spain
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