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• W2007185809 abstract "Abstract The reaction of ( Z )‐2‐[amino(pyridine‐2‐yl)methylene]hydrazonecarbothioamide (HAm4DH) with Mn(ClO 4 ) 2 ·6H 2 O afforded different mononuclear or polynuclear manganese(II) complexes, the nature of which apparently depended on the solvent used. For example, in ethanol a compound of formula [Mn(HAm4DH) 2 ](ClO 4 ) 2 ( 1 ) was obtained, where HAm4DH coordinates as a common tridentate NNS donor, but the [Mn(bpy) 2 (NCS) 2 ] complex ( 2 ) (bpy = 2,2'‐bipyridine) has also been obtained – probably due to C–N bond cleavage of the thiosemicarbazone. Nevertheless, in a basic aqueous medium [Mn(bpy) 3 ](ClO 4 ) 2 ·0.5bpy ( 3 ) is formed and there is structural evidence for chemical transformations of the thiosemicarbazone promoted by Mn II . Thus, the sulfate in {[Mn(py) 4 Mn(py) 2 (H 2 O) 2 ( μ ‐SO 4 ) 2 ]·4H 2 O} n ( 4 ) or sulfate and cyclooctasulfur in [Mn(pta) 2 (pdo)] 4 (SO 4 ) 2 ·4H 2 O·S 8 ] ( 5 ), where pta is 3‐(pyridin‐2‐yl)‐1,2,4‐triazol‐5‐amine and pdo is (2 R ,4 R /2 S, 4 S )‐pentane‐2,4‐diolato, arise from the desulfuration and oxidation of the thiosemicarbazone ligand. The structures of complexes 2 to 5 were established by single‐crystal X‐ray diffraction. The formation of pta is the result of the oxidative cyclization of HAm4DH. In the polynuclear complex 4 , the sulfate acts as an (O,O') bridge between alternating Mn(py) 2 (H 2 O) 2 and Mn(py) 4 centers. In the tetranuclear complex 5 , pta acts as a bischelating ligand through the N‐pyridine and N‐triazole, and pdo act as a bridge between two manganese atoms. It is also noteworthy that in complexes 4 and 5 hydrogen bonds give rise to different self‐assembly behaviour that leads to complicated supramolecular structures." @default.
• W2007185809 created "2016-06-24" @default.
• W2007185809 creator A5003716046 @default.
• W2007185809 creator A5032926604 @default.
• W2007185809 date "2008-11-18" @default.
• W2007185809 modified "2023-10-18" @default.
• W2007185809 title "Desulfuration and Cyclization of (<i>Z</i>)-2-[Amino(pyridine-2-yl)methylene]- hydrazonecarbothioamide in the Presence of Manganese(II)" @default.
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• W2007185809 doi "https://doi.org/10.1002/zaac.200800326" @default.
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