Retention properties of nitro derivatives of pyridylazo naphthol and their metal complexes in RP-HPLC

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  • 逆相高速液体クロマトグラフィーにおけるピリジルアゾナフトールのニトロ誘導体及びその金属錯体の保持特性
  • ギャクソウ コウソク エキタイ クロマトグラフィー ニ オケル ピリジルアゾナフトール ノ ニトロ ユウドウタイ オヨビ ソノ キンゾク サクタイ ノ ホジ トクセイ

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Description

The retention properties of mono-nitrated 2-(2-pyridylazo)-1-naphthol (xN-α-PAN, x = 3 or 5), in which a nitro group was involved at the 3- or 5-position of each pyridine ring, and their metal complexes in reversed-phase high-performance liquid chromatography (RP-HPLC) were investigated. The retention time for the neutral complexes became longer in the nitro derivatives systems than in the α-PAN system. The bulkiness of the nitro group strongly influences the retention time for each metal complex. The peaks for cobalt(II) complexes as well as that for cobalt(III) complexes were observed in the N-α-PAN systems. Moreover, only in the 3N-α-PAN system, the retention time of the reagent itself was observed to be shorter than that of the cationic Co(III) complex. The acid dissociation constant, the partition constant, and the crystal structure of 3N-α-PAN suggested that the neutral form exists as a hydrazone (keto) tautomer.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 52 (12), 1121-1129, 2003

    The Japan Society for Analytical Chemistry

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