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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and characterisation of cis-dioxomolybdenum(VI) complexes of N-substituted 3-hydroxy-2-pyridinones
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Synthesis and characterisation of cis-dioxomolybdenum(VI) complexes of N-substituted 3-hydroxy-2-pyridinones

机译：N-取代的3-羟基-2-吡啶酮类顺式-二氧钼钼（VI）配合物的合成与表征

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摘要

The butoxy- and methoxy-derivatives (HLc, and HLb, respectively) of 1-[(ethoxycarbonyl)methyl]-3-hydroxy-2-(1H)-pyridinone, HLa, were synthesized by transesterification and the mononuclear complexes [MoO2(La-c)(2)] were obtained by the reaction of the ligands with molybdenyl acetylacetonate. The three complexes were fully characterized by H-1 and C-13 NMR spectroscopy, mass spectrometry and elemental analyses. A variable temperature NMR study showed that the N-substituents do not have a significant influence on the racemisation process of the complexes. The comparison of the crystal structure of [MoO2(L-b)(2)] with [MoO2(L-a)(2)] confirmed that an additional methylene group does not affect the immediate coordination environment of the molybdenum centre. The methoxy-derivative HLb was also found to produce a dinuclear complex of composition [{MoO2(L-b)O}(2)], the structure of which was determined by X-ray diffraction.
机译：1-[（乙氧羰基）甲基] -3-羟基-2-（1H）-吡啶酮HLa的丁氧基和甲氧基衍生物（分别为HLc和HLb）通过酯交换反应和单核络合物[MoO2（ La-c）（2）]通过配体与钼烯基乙酰丙酮化物的反应获得。通过H-1和C-13 NMR光谱，质谱和元素分析充分表征了这三种配合物。可变温度NMR研究表明，N取代基对络合物的外消旋过程没有重大影响。 [MoO2（L-b）（2）]与[MoO2（L-a）（2）]的晶体结构比较证实，额外的亚甲基不会影响钼中心的即时配位环境。还发现甲氧基衍生物HLb产生组成为[{MoO 2（L-b）O}（2）]的双核络合物，其结构通过X射线衍射确定。

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