XAFS study of metal chelates of phenylazo derivatives of Schiff bases

• Four complexes (3a–d) synthesized on the base of bidentate N,N-ligand 2.
• The structure of imine 2 was determined by X-ray crystallography.
• Parameters and geometry of the local donor environment for 3a–с were established by XAFS.

The Schiff base derived from o-tosylaminobenzaldehyde and p-aminoazobenzene and its metal chelates (Co2+, Ni2+, Cu2+, and Zn2+) have been synthesized and investigated (IR, 1H NMR, XANES, EXAFS spectroscopy, X-ray diffraction, magnetic measurements). It was found that the azomethine exists in the amino-imine tautomeric form both in solutions and solid state. XAFS investigations reveal that the complexes adopt either distorted tetrahedral or octahedral (due to additional coordination of oxygen atoms of the tosylamino group) ligand environment.

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