The IR spectra (75-4000) cm-1) of 5 arylhydroxyoximes and their transition metal complexes as well as their corresponding 1kN isotope analogs were measured. According to the 15N isotope shifted bands, the characteristic nC:N and n:N-O frequencies of the oximes and their metal complexes are assigned to a medium strong band in 1640~1610 cm-1 region and near 1000 cm-1 resp. In low frequency region, a weak band showing small 1kN isotope shift in 380~330 cm-1 is assigned to metal-ligand M-N, coordination bond stretching mode absorption for the complexes. Using 63Cu and 65Cu isotope shifts, a medium strong band in 270~220 cm-1 region was tentatively assigned to nM-O mode absorption. For HAP coordinated with different metals, the nOH and n-N-O frequencies of the complexes increase and slightly decrease resp. according to the sequence: Fe2+, Co2+, Cu2+, Ni2+. The sequence is in consistent with the radius of the metal ions and the reported relative mol. ion peak heights of their electroionization mass spectra.

Key words: AROMATIC HYDROCARBON, INFRARED SPECTROPHOTOMETRY, STRUCTURAL ANALYSIS, CHEMICAL SHIFT, CHEMICAL BONDS, OXIME, TRANSITION METAL COMPLEX, NITROGEN ISOTOPES