[4-[α-[4-(dimethylamino)phenyl]benzylidene]cyclohexa-2,5-dien-1-ylidene]dimethylammonium acetate

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

November 3, 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Qualifier:

according to guideline

Guideline:

other: OECD Guideline 103 (Boiling point)

Principles of method if other than guideline:

Analysis based on internal method SOP-STR 028.

GLP compliance:

no

Type of method:

differential scanning calorimetry

Remarks on result:

other: no melting point between 25 and 450 °C

DSC profile showed:

1. endothermic event between 32 and 152 °C (onset 32 °C, enthalpy -156 J/g)

2. exothermic event between 163 and 279 °C (onset 163 °C, enthalpy -190 J/g)

3. endothermic event between 306 and 354 °C (onset 320 °C, enthalpy -21 J/g)

Conclusions:

Melting point: 140°C

Executive summary:

Method

Differential scanning calorimetry analysis carried out between 25 and 450 °C, increasing temperature by 20 °C/min under N₂.

Results

No melting point was seen.

DSC profile showed:

1. endothermic event between 140 and 152 °C (onset 140 °C, enthalpy -156 J/g)

2. exothermic event between 165 and 279 °C (onset 165 °C, enthalpy -190 J/g)

3. endothermic event between 306 and 354 °C (onset 320 °C, enthalpy -21 J/g)

Description of key information

140 °C;

Decomposition: 165 °C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

140 °C

Additional information

R&C DSC showed a Malachite Green 4 Acetate melting point at 140°C and a reaction of decomposition at 165°C.