Original scientific paper

Hydrogen Bonded Dimer N-(2-hydroxyethyl)-2-oxy-1-naphthaldimine and Its Oxo-vanadium(V) Complex

Branko Kaitner ; Department of Chemistry, Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, HR-10000 Zagreb, Croatia
Gordana Pavlović ; Department of Chemistry, Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, HR-10000 Zagreb, Croatia

Abstract

N-(2-hydroxyethyl)-2-oxy-1-naphthaldimine is a potential tridentate ligand prepared in a condensation reaction from 2-hydroxy-1- naphthaldehyde and 2-aminoethanol using catalytic amounts of triethylamine. Its vanadium(V) coordination compound was obtained by a template reaction from the methanol solution upon oxidation of VO2+ → VO3+ in air. Physico-chemical properties of both compounds were examined by thermogravimetric analysis, differential scanning calorimetry and FT IR spectroscopy. These results supplied some elements of structural information. Nevertheless, the entire stereochemistry of both the non-coordinated ligand and metal complex was elucidated by the X-ray structural determination. The ligand forms molecular complex by dimerization via intermolecular O–H⋅⋅⋅O hydrogen bonding. In the metal complex, four square pyramid basal plane coodination places are occupied by dinegative tridentate ligand ONO donor atoms and a methoxy group. All V–O bond distances are significantly different, depending on the nature of the functional group to wich oxygen atoms belong. The vanadium complex is an example of a fairly rare pentacoordinated square pyramidal VV species.

Keywords

tridentate naphthaldimine; oxo-vanadium(V) complex; dimerization by hydrogen bonding; X-ray diffraction; thermal analysis; FT IR spectroscopy

Hrčak ID:

132253

URI

https://hrcak.srce.hr/132253

Publication date:

1.9.1999.

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