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Suman SG, Gretarsdottir JM, Penwell PE, Gunnarsson JP, Frostason S, Jonsdottir S, Damodaran KK, Hirschon A. Reaction Chemistry of the syn-[Mo 2O 2(μ-S) 2(S 2)(DMF) 3] Complex with Cyanide and Catalytic Thiocyanate Formation. Inorg Chem 2020; 59:7644-7656. [PMID: 32401019 DOI: 10.1021/acs.inorgchem.0c00608] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Removal of cyanide as nontoxic thiocyanate under physiological conditions may serve as a catalytic detoxification route in vivo. Aqueous catalytic reaction conditions were explored where at the conditions employed the reaction proceeded to exhaustion in 1 h. The complex, syn-[Mo2O2(μ-S)2(S2)(DMF)3] 1, participates in a ligand exchange reaction of the dimethylformamide ligands and cyanide. Simultaneous sulfur abstraction reaction from the terminal disulfide group forms thiocyanate and terminal sulfido ligand. Respective reaction rates for the two reactions appear competitive where different products were isolated solely based on change of reaction temperature. The approach to determine the number of cyanide ligands participating in the ligand exchange reaction by varying the stoichiometry and reaction temperature led to identification and isolation of tetranuclear complexes 2 and 5 and dinuclear complexes 3, 4, and 6. A synthesized and fully characterized thiocyanate analog of 6 (7) supports spectroscopic characterization of 6. The tetranuclear anion, [Mo4O4(μ-S)6(CN)4]4-, 2, was crystallized from a reaction at ambient temperature. The dinuclear anion, [Mo2O2(μ-S)2(S)(CN)3]3-, 3, was crystallized from similar reaction conditions at lower temperature. The reaction yield of thiocyanate obtained at pH of 7.4 and at 9.2 as a function of time, for several ratios of cyanide, favors the sulfur abstraction reaction at elevated pH. The sulfur abstraction reaction is the first step in a proposed mechanism of the reaction of cyanide and thiosulfate to form thiocyanate and sulfite by 1.
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Affiliation(s)
- Sigridur G Suman
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland.,Chemical Science and Technology Laboratory, Physical Sciences Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
| | | | - Paul E Penwell
- Chemical Science and Technology Laboratory, Physical Sciences Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
| | - Jon P Gunnarsson
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | - Sindri Frostason
- Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland
| | | | | | - Albert Hirschon
- Chemical Science and Technology Laboratory, Physical Sciences Division, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025, United States
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Masternak J, Zienkiewicz-Machnik M, Kowalik M, Jabłońska-Wawrzycka A, Rogala P, Adach A, Barszcz B. Recent advances in coordination chemistry of metal complexes based on nitrogen heteroaromatic alcohols. Synthesis, structures and potential applications. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.01.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Suckert S, Wöhlert S, Näther C. Synthesis, structures, and properties of Mn(II) and Cd(II) thiocyanato coordination compounds with 2,5-dimethylpyrazine as co-ligand. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2016. [DOI: 10.1515/znb-2015-0182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractReaction of manganese (II) thiocyanate with 2,5-dimethylpyrazine leads to the formation of three new coordination compounds of compositions Mn(NCS)2(2,5-dimethylpyrazine)2(H2O)2(1), Mn(NCS)2(H2O)2(MeOH)2-tris(2,5-dimethylpyrazine) solvate (2), and Mn(NCS)2(H2O)4-tetrakis(2,5-dimethylpyrazine) solvate (3) that were characterized by single crystal X-ray diffraction. In their crystal structures, the Mn(II) cations are sixfold coordinated by two terminally N-bonded thiocyanato anions and two water molecules as well as by two 2,5-dimethylpyrazine ligands (1), two ethanol (2), or two water molecules (3), within slightly distorted octahedra. In compounds2and3, additional 2,5-dimethylpyrazine ligands are located in the cavities of the structures as solvate molecules. X-ray powder diffraction has shown that compounds1and2cannot be prepared as pure phases and that batches of compound3contain only minor traces of a contamination. Differential thermoanalysis and thermogravimetry have revealed that upon heating of compound3, an intermediate of composition Mn(NCS)2(2,5-dimethylpyrazine) (4) is formed, which cannot be obtained from solution. To mimic the structure of4, single crystals of a Cd compound of the same composition (5) were prepared from the liquid phase, and single crystal X-ray analysis has shown that it is isotypic to4.
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Affiliation(s)
- Stefan Suckert
- Institut für Anorganische Chemie , Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2, 24118 Kiel, Germany
| | - Susanne Wöhlert
- Institut für Anorganische Chemie , Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2, 24118 Kiel, Germany
| | - Christian Näther
- Institut für Anorganische Chemie , Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2, 24118 Kiel, Germany
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Synthesis, Structures and Properties of Cobalt Thiocyanate Coordination Compounds with 4-(hydroxymethyl)pyridine as Co-ligand. CRYSTALS 2016. [DOI: 10.3390/cryst6040038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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