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EC number: 263-319-6 | CAS number: 61916-41-4
Endpoint summary
Administrative data
Description of key information
Additional information
The physicochemical characterization of Acid Violet 090 (AV090) has been experimentally performed; in some cases, in order to interpretate the experimental results as better as possible, data on the chromate-pyrazole complexes family have been taken into account.
APPEARANCE AND PHYSICOCHEMICAL STATE
AV090 is a dark-red solid crystal at 20 °C and 1013 Pa; it is primarily marketed/used in a non solid or granular form.
The Differential Scanning Analysis Calorimetry (DSC) showed three endothermic reactions: the first 50 -87 °C , with an intensity of -56.4 J/g; the second between 137 - 172 °C associated to an intensity of -17.8 J/g. and the third endothermic peak can be observed at 229 - 279 °C with an energy of -28.2 J/g.
The first reaction at 50 - 87 °C can be attribute to the water/solvent release. Both the second and third peaks cannot be associated to melting/boiling reaction, based on the endothermic energy involved and the curve-shape. The onset of the third peak (at 232.30 °C) seem to be the beginning of a decomposition reaction.
Based on data on the analogous substances Similar Substance 01, Similar Substance 02 and Similar Substance 02b, the substance decomposes before melting/boiling. In general, chromate-pyrazol derivatives share the same thermal behaviour, with exothermic decomposition at temperature between 150 -400 °C and with an energy less than 500 J/g. Chromato-pyrazole dye complexes are substances characterized by several aromatic rings, in resonance, which determine the coloured aspect of the dye (its primary function). The actual energy of the molecule in resonance is lower than might be expected for any of the contributing structures and it can be expect that the resonance could improve the substance stability. Experimental results on assays performed on chromate-pryrazole complexes do not deny this deduction.
SOLUBILITY AND PARTITION COEFFICIENT
The affinity of AV090 with the n-octanol phase is low, demonstrated by a negative logKow (i.e. -1.8).
The solubility was assayed using the shake flask method and it was measured at 24, 48 and 96 hours (56, 65 and 57 g/l, respectively) and the resulting average was 59.14 g/l, at 20 °C and pH 6.98.
PHYSICAL HAZARDS
AV090 is not expected to not ignite and propagate combustion; no chemical groups associated with oxidising properties are present in the molecule.
The substance does not meet the criteria to be considered as flammable/explosive/oxidising.
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