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Intracomplex Dioxomolybdenum(VI) Compounds with Alcoholimines of Aromatic o -Hydroxyaldehydes. Crystal Structure of 2-Hydroxynaphthylidene Monoethanolimine (H 2 L) and Solvated Complex [MoO 2 (L) · C 5 H 5 N]
Russian Journal of Inorganic Chemistry ( IF 1.8 ) Pub Date : 2020-04-28 , DOI: 10.1134/s0036023620040166
V. S. Sergienko , V. L. Abramenko , M. D. Surazhskaya

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 L2– (Mo–NL 2.262(4) Å) and the N atom of the pyridine molecule (Mo–NPy 2.496(4) Å). The Mo–NL and Mo–NPy 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:

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。
更新日期:2020-04-28
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