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Müller-Meinhard A, Jess I, Näther C. Synthesis, crystal structure and properties of chlorido-tetra-kis-(pyridine-3-carbo-nitrile)-thio-cyanato-iron(II). Acta Crystallogr E Crystallogr Commun 2023; 79:1173-1178. [PMID: 38313120 PMCID: PMC10833408 DOI: 10.1107/s205698902300988x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 11/14/2023] [Indexed: 02/06/2024]
Abstract
Reaction of FeCl2·4H2O with KSCN and 3-cyano-pyridine (pyridine-3-carbo-nitrile) in ethanol accidentally leads to the formation of single crystals of Fe(NCS)(Cl)(3-cyano-pyridine)4 or [FeCl(NCS)(C6H4N2)4]. The asymmetric unit of this compound consists of one FeII cation, one chloride and one thio-cyanate anion that are located on a fourfold rotation axis as well as of one 3-cyano-pyridine coligand in a general position. The FeII cations are sixfold coordinated by one chloride anion and one terminally N-bonding thio-cyanate anion in trans-positions and four 3-cyano-pyridine coligands that coordinate via the pyridine N atom to the FeII cations. The complexes are arranged in columns with the chloride anions, with the thio-cyanate anions always oriented in the same direction, which shows the non-centrosymmetry of this structure. No pronounced inter-molecular inter-actions are observed between the complexes. Initially, FeCl2 and KSCN were reacted in a 1:2 ratio, which lead to a sample that contains the title compound as the major phase together with a small amount of an unknown crystalline phase, as proven by powder X-ray diffraction (PXRD). If FeCl2 and KSCN is reacted in a 1:1 ratio, the title compound is obtained as a nearly pure phase. IR investigations reveal that the CN stretching vibration for the thio-cyanate anion is observed at 2074 cm-1, and that of the cyano group at 2238 cm-1, which also proves that the anionic ligands are only terminally bonded and that the cyano group is not involved in the metal coordination. Measurements with thermogravimetry and differential thermoanalysis reveal that the title compound decomposes at 169°C when heated at a rate of 4°C min-1 and that the 3-cyano-pyridine ligands are emitted in two separate poorly resolved steps. After the first step, an inter-mediate compound with the composition Fe(NCS)(Cl)(3-cyano-pyridine)2 of unknown structure is formed, for which the CN stretching vibration of the thio-cyanate anion is observed at 2025 cm-1, whereas the CN stretching vibration of the cyano group remain constant. This strongly indicates that the FeII cations are linked by μ-1,3-bridg-ing thio-cyanate anions into chains or layers.
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Affiliation(s)
- Asmus Müller-Meinhard
- Institut für Anorganische Chemie, Universität Kiel, Max-Eyth. Str. 2, 24118 Kiel, Germany
| | - Inke Jess
- Institut für Anorganische Chemie, Universität Kiel, Max-Eyth. Str. 2, 24118 Kiel, Germany
| | - Christian Näther
- Institut für Anorganische Chemie, Universität Kiel, Max-Eyth. Str. 2, 24118 Kiel, Germany
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Synthesis, Structures, and Photoluminescence of Two Novel Zinc(II) Compounds Containing 2-Acetylpyridine-aminoguanidine. INORGANICS 2022. [DOI: 10.3390/inorganics10100147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In the reaction of zinc(II) sulfate and the chloride salt of 2-acetylpyridine-aminoguanidine, two types of complex were obtained, i.e., [Zn(H2O)6](H2L)2(SO4)3·3H2O and [Zn(L)H2O(SO4)]·H2O, depending on the presence of LiOAc as the deprotonating agent. The physicochemical, structural, and photoluminescence properties of the complexes were examined. In the first complex, obtained in the absence of LiOAc, the Schiff base had the role of a counter-ion in its doubly protonated form, while in the presence of LiOAc, upon deprotonation, coordination takes place, and thus the Schiff base acts as a tridentate N3 ligand. In the latter complex, the ligand is coordinated through pyridine, azomethine, and the imino nitrogen of the aminoguanidine residue, leading to formation of two fused five-membered chelate rings. Both the examined complexes, as well as the ligand itself, show high photoluminescence.
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Solution Equilibrium Studies on Salicylidene Aminoguanidine Schiff Base Metal Complexes: Impact of the Hybridization with L-Proline on Stability, Redox Activity and Cytotoxicity. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27072044. [PMID: 35408443 PMCID: PMC9000575 DOI: 10.3390/molecules27072044] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/15/2022] [Accepted: 03/19/2022] [Indexed: 11/16/2022]
Abstract
The proton dissociation processes of two tridentate salicylidene aminoguanidine Schiff bases (SISC, Pro-SISC-Me), the solution stability and electrochemical properties of their Cu(II), Fe(II) and Fe(III) complexes were characterized using pH-potentiometry, cyclic voltammetry and UV-visible, 1H NMR and electron paramagnetic resonance spectroscopic methods. The structure of the proline derivative (Pro-SISC-Me) was determined by X-ray crystallography. The conjugation of L-proline to the simplest salicylidene aminoguanidine Schiff base (SISC) increased the water solubility due to its zwitterionic structure in a wide pH range. The formation of mono complexes with both ligands was found in the case of Cu(II) and Fe(II), while bis complexes were also formed with Fe(III). In the complexes these tridentate ligands coordinate via the phenolato O, azomethine N and the amidine N, except the complex [Fe(III)L2]+ of Pro-SISC-Me in which the (O,N) donor atoms of the proline moiety are coordinated beside the phenolato O, confirmed by single crystal X-ray crystallographic analysis. This binding mode yielded a stronger Fe(III) preference for Pro-SISC-Me over Fe(II) in comparison to SISC. This finding is also reflected in the lower redox potential value of the iron-Pro-SISC-Me complexes. The ligands alone were not cytotoxic against human colon cancer cell lines, while complexation of SISC with Cu(II) resulted in moderate activity, unlike the case of its more hydrophilic counterpart.
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Sureshbabu P, Varghese B, Sujitha E, Sabiah S. Syntheses, Structure, DNA Docking and Antimicrobial Studies of Copper(II) Complexes with Diethylenetriamine and N-Bidentate Ligands. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Jin ZS, Liu XJ, Li ZY, Liu E, Jian FF, Liang T. Crystal structure of (E)-(2-((1H-pyrrol-2-yl)methylene)hydrazineyl)(amino)methaniminium nitrate monohydrate, C6H12N6O4. Z KRIST-NEW CRYST ST 2021. [DOI: 10.1515/ncrs-2021-0084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C6H12N6O4, monoclinic, P21/n (no. 14), a = 7.3652(3) Å, b = 16.8683(7) Å, c = 8.3779(3) Å, β = 101.525(4)°, V = 1019.87(7) Å3, Z = 4, R
gt
(F) = 0.0349, wR
ref
(F
2) = 0.1018, T = 170 K.
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Affiliation(s)
- Ze-Sen Jin
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology , Luoyang , Henan 471003 , P. R. China
| | - Xiao-jing Liu
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology , Luoyang , Henan 471003 , P. R. China
| | - Zhuang-Yu Li
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology , Luoyang , Henan 471003 , P. R. China
| | - E. Liu
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang Hekeda Recycling Energy Co.Ltd. , Luoyang , Henan 471003 , P. R. China
| | - Fang-fang Jian
- School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang Hekeda Recycling Energy Co.Ltd. , Luoyang , Henan 471003 , P. R. China
| | - Tongling Liang
- Institute of Chemistry, Chinese Academy of Sciences , Zhongguancun , Beijing 100190 , P. R. China
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Radanović MM, Rodić MV, Vojinović-Ješić LS, Armaković S, Armaković SJ, Leovac VM. Complexes of Zn(II) and Cd(II) with 2-acetylpyridine -aminoguanidine – Syntheses, structures and DFT calculations. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.12.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Magyari J, Barta Holló B, Vojinović-Ješić LS, Radanović MM, Armaković S, Armaković SJ, Molnár J, Kincses A, Gajdács M, Spengler G, Mészáros Szécsényi K. Interactions of Schiff base compounds and their coordination complexes with the drug cisplatin. NEW J CHEM 2018. [DOI: 10.1039/c8nj00357b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
There is a complex interplay between the structural and other physicochemical properties of new compounds and the molecules in living organisms.
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Dihydroxo-bridged dimeric Cu(II) system containing sandwiched non-coordinating phenylacetate anion: Crystal structure, spectroscopic, anti-bacterial, anti-fungal and DNA-binding studies of [(phen)(H 2 O)Cu(OH) 2 Cu(H 2 O)(phen)]2L.6H 2 O: (HL = phenylacetic acid; phen = 1,10-phenanthroline). J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.04.084] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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1-{4-[(Hexyloxy)methyl]pyridin-2-yl}ethanone. MOLBANK 2017. [DOI: 10.3390/m940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Buvaylo EA, Kokozay VN, Vassilyeva OY, Skelton BW, Nesterova OV, Pombeiro AJ. Copper(II) complex of the 2-pyridinecarbaldehyde aminoguanidine Schiff base: Crystal structure and catalytic behaviour in mild oxidation of alkanes. INORG CHEM COMMUN 2017. [DOI: 10.1016/j.inoche.2017.03.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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