Abstract

A Schiff base, which is a derivative of 2-hydroxynaphthaldehyde and monoethanolamine (H₂L), and an intracomplex compound of dioxomolybdenum(VI) [MoO₂(L) · C₅H₅N] (I) have been synthesized. The structures of H₂L and I have been determined by IR spectroscopy and X-ray diffraction. In the mononuclear molecule I, the Mo atom has an octahedral coordination formed by two oxo-ligands (Mo=O 1.683(4) and 1.697(3) Å), two O atoms of deprotonated hydroxy groups of the alcohol (Mo–O(4) 1.919(4) Å) and aldehyde (Mo–O(3) 1.962(3) Å) fragments, as well as the N atom of the tridentate bis-chelate doubly charged ligand L^2– (Mo–N_L 2.262(4) Å) and the N atom of the pyridine molecule (Mo–N_Py 2.496(4) Å). The Mo–N_L and Mo–N_Py bonds are significantly elongated due to the structural manifestation of trans-influence of multiply bound oxo ligands. The free H₂L molecule crystallizes in the quinoid (keto-amine) tautomeric form, and in complex I it is coordinated in the double-deprotonated benzoid (enol-imine) form.

中文翻译：

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复杂的二氧杂钼（VI）化合物与芳香邻羟基醛的醇亚胺。2-羟基亚萘基单乙醇亚胺（H 2 L）和溶剂化物[MoO 2（L）·C 5 H 5 N]的晶体结构

摘要

已经合成了作为2-羟基萘醛和单乙醇胺（H ₂ L）的衍生物的席夫碱和二氧钼（VI）[MoO ₂（L）·C ₅ H ₅ N]（I）的内络合物。H ₂ L和I的结构已经通过IR光谱和X射线衍射确定。在单核分子I中，Mo原子具有由两个氧配体（Mo = O 1.683（4）和1.697（3）Å），醇的去质子化羟基的两个O原子（Mo–O（ 4）1.919（4）Å）和醛（Mo–O（3）1.962（3）Å）片段，以及三齿双螯合物双电荷配体L ^2–的N原子（Mo–N _L 2.262（4）Å）和吡啶分子的N原子（Mo–N _Py 2.496（4）Å）。Mo-N _L和Mo-N _Py键由于多重结合的氧代配体的反式影响而显着延长。游离的H ₂ L分子以醌型（酮胺）互变异构形式结晶，在配合物I中，它以双去质子化的苯甲酸酯（烯醇-亚胺）形式配位。