Photochemical Reactions of [M(CO)₅THF] (M: Cr, Mo and W) with Tetradentate Schiff-bases

Abstract

The new complexes, [(μ-CO)₂Cr₂(η⁴-H₂L)₂], 1; [(μ-CO)M₂(CO)₂(η₄-H₂L)₂], [M˭Mo; 2, W; 3]; [(μ-CO)₂Cr₂(η₄-H₂L′)₂], 4 and [(μ -CO)M₂(CO)₂(η₄-H₂L′)₂], [M˭Mo; 5, W; 6] have been synthesized by the photochemical reactions of photogenerated intermediate, M(CO)₅THF (M˭Cr, Mo, W) with two oxygen and nitrogen donor Schiff base ligands, N,N′-bis(2-hydroxynaphtalin-1-carbaldehydene)-1,2-bis(p-aminophenoxy)ethane (H₂L) and N,N′-bis(2-hydroxynaphtalin-1-carbaldehydene)-1,4-bis(p-aminophenoxy)butane (H₂ L′). The complexes have been characterized by elemental analyses, LC-mass spectrometry, magnetic studies, FTIR and ₁H-NMR spectroscopy. The spectroscopic studies show that H₂ L and H₂ L′ ligands are coordinated to the central metal as tetradentate ligands coordinating via their imine N and O donor atoms in (1–6).

Keywords:

• N,N′-bis(2-hydroxynaphtalin-1-carbaldehydene)-1
• 2-bis(p-aminophenoxy)ethane
• N,N′-bis(2-hydroxynaphtalin-1-carbaldehydene)-1
• 4-bis(p-aminophenoxy) butane
• metal carbonyls
• Schiff base

Acknowledgments

We thank the Research Foundation of Dokuz Eylul and Dicle University for funds. We thank TUBITAK for allocation of time at the Mass Spectra and Elemental Analyses. We thank Ege University for obtaining ¹H-NMR spectra. This work was supported by Dokuz Eylul University, Project: 05.KB.FEN.019.

Notes

^aAll complexes are brown.

^a Intramolecular hydrogen bonded –OH

^b Taken from Ref. [15].

^aδ in ppm, J in Hz

^b Taken from Ref. [15].