Intracomplex Dioxomolybdenum(VI) Compounds with Alcoholimines of Aromatic o-Hydroxyaldehydes. Crystal Structure of 2-Hydroxynaphthylidene Monoethanolimine (H2L) and Solvated Complex [MoO2(L) · C5H5N]

• Published in: Russian journal of inorganic chemistry Vol. 65; no. 4; pp. 495 - 501
• Main Authors: Sergienko, V. S., Abramenko, V. L., Surazhskaya, M. D.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-04-2020; Springer Nature B.V
• Subjects: Aldehydes; Aromatic compounds; Chelates; Chemistry; Chemistry and Materials Science; Coordination Compounds; Crystal structure; Crystals; Elongated structure; Imines; Infrared spectroscopy; Inorganic Chemistry; Ions; Ligands; Molybdenum oxides; Monoethanolamine (MEA); synthesis; IR spectroscopy; X-ray diffraction analysis; 2-hydroxynaphthylidene monoethanolimine; molybdenum(VI) dioxocomplexes
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023620040166

A Schiff base, which is a derivative of 2-hydroxynaphthaldehyde and monoethanolamine (H
2
L), and an intracomplex compound of dioxomolybdenum(VI) [MoO
2
(L) · C
5
H
5
N] (
I
) have been synthesized. The structures of H
2
L 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 H
2
L molecule crystallizes in the quinoid (keto-amine) tautomeric form, and in complex
I
it is coordinated in the double-deprotonated benzoid (enol-imine) form.