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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Monomeric thorium chalcogenolates with bipyridine and terpyridine ligands
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Monomeric thorium chalcogenolates with bipyridine and terpyridine ligands

机译:单体钍硫酸盐与双吡啶和噻啶配体

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Thorium chalcogenolates Th(ER)(4) react with 2,2'-bipyridine (bipy) to form complexes with the stoichiometry (bipy)(2)Th(ER)(4) (E = S, Se; R = Ph, C6F5). All four compounds have been isolated and characterized by spectroscopic methods and low-temperature single crystal X-ray diffraction. Two of the products, (bipy)(2)Th(SC6F5)(4) and (bipy)(2)Th(SeC6F5)(4), crystallize with lattice solvent, (bipy)(2)Th(SPh)(4) crystallizes with no lattice solvent, and the selenolate (bipy)(2)Th(SePh)(4) crystallizes in two phases, with and without lattice solvent. In all four compounds the available volume for coordination bounded by the two bipy ligands is large enough to allow significant conformational flexibility of thiolate or selenolate ligands. Se-77 NMR confirms that the structures of the selenolate products are the same in pyridine solution and in the solid state. Attempts to prepare analogous derivatives with 2,2',6',2 ''-terpyridine (terpy) were successful only in the isolation of (terpy)(py)Th(SPh)(4), the first terpy compound of thorium. These materials are thermochromic, with color attributed to ligand-to-ligand charge transfer excitations.
机译:钍Chalcogentates Th(ER)(4)与2,2'-硼吡啶(Bipy)反应,形成与化学计量(Bipy)(2)(2)Th(ER)(E = S,Se; R = pH的复合物, C6F5)。通过光谱法和低温单晶X射线衍射被隔离和表征所有四种化合物。其中两种产品,(Bipy)(2)Th(SC6F5)(4)和(Bipy)(2)(SEC6F5)(4),用晶格溶剂结晶,(Bipy)(2)Th(SPH)(4 )用没有晶格溶剂结晶,硒固醇酸盐(Bipy)(2)(2)(Seph)(4)在两个阶段结晶,具有和无晶格溶剂。在所有四种化合物中,由两个Bipy配体界定的配位的可用体积足够大,以允许硫醇酸盐或硒固盐配体的显着构象灵活性。 SE-77 NMR证实硒固醇产物的结构在吡啶溶液中和固态中是相同的。试图制备2,2',6',2'' - 吡啶(Terpy)的类似衍生物仅在分离(Terpy)(Py)Th(SPH)(4)中是成功的,这是钍的第一个花椰菜化合物。这些材料是热致变色的,颜色归因于配体与配体电荷转移激发。

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