Nitrazine Yellow is an indicator used in microscopy with variations of absorption visible spectrum in pH range 6.0–7.0. The stated structure, deriving from the attack of 20,40-dinitrobenzenediazonium salt to ortho hydroxy position of 1-naphthol-3,6-disulphonic acid, appears incoherent with the alochromic behaviour. Nmr analysis and, in particular, HMQCand HMBCtwo-dimensional techniques showed that the real structure comes from an attack of the diazonium salt to para hydroxy position.
Structural Characterisation of Nitrazine Yellow by NMR Spectroscopy
DIGILIO, GIUSEPPE;
2003-01-01
Abstract
Nitrazine Yellow is an indicator used in microscopy with variations of absorption visible spectrum in pH range 6.0–7.0. The stated structure, deriving from the attack of 20,40-dinitrobenzenediazonium salt to ortho hydroxy position of 1-naphthol-3,6-disulphonic acid, appears incoherent with the alochromic behaviour. Nmr analysis and, in particular, HMQCand HMBCtwo-dimensional techniques showed that the real structure comes from an attack of the diazonium salt to para hydroxy position.File in questo prodotto:
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