Trichloro(N,N-dimethyloctylamine)boron

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Testing was conducted between 14th July and 14th October 2014

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Atm. press.:

101 kPa

Decomposition:

yes

Decomp. temp.:

94.6 °C

Remarks on result:

other: No determination of the boiling temperature was possible, as the test item decomposed from approximately 94.6 °C (368 K) at 101 kPa.

Determination 1 (Air) - Thermographic Data

 

Thermal event	Interpretation	Temperature
		ºC	K
Approximate onset of exotherm	Approximate onset of decomposition	94.7	368

 

Atmospheric pressure: 101kPa

Determination 2 (Nitrogen) - Thermographic Data

 

Thermal event	Interpretation	Temperature
		ºC	K
Approximate onset of exotherm	Approximate onset of decomposition	94.6	368

 

Atmospheric pressure: 101kPa

The test item was assessed initially as a light amber/colorless flaky solid. The appearance of the residues after thermal analysis, recorded on each thermogram, suggested decomposition. A modified capillary method was performed for confirmation.

Capillary method:

Observation times, temperatures and test item appearances are presented below:

Time (min)	Temperature (ºC)	Temperature (K)	Test item observations
0	24.0	297	Light amber flaky solid.
11	80.0	353	Amber liquid.
16	120	393	Amber liquid presenting small bubbles.
21	125	398	Dark amber liquid presenting a few bubbles on the surface.
36	175	448	No change observed.
39	184	457	Aliquot is very dark brown at the surface and a lighter brown at the base of the test tube.
54	200	473	No change observed.
65	205	478	Liquid surface darkens in color.
75	212	485	Whole aliquot is very dark brown.
82	230	503	No change observed.
87	240	513	Black liquid.
94	245	518	No change observed.
98	258	531	Black liquid degrading further.
101	270	543	Black liquid. Smoke emerging from test tube.
103	280	553	Black liquid presenting bubbles. Smoke emerging from test tube.
108	304	577	Black liquid bubbling and smoking.
112	315	588	No change observed. Test stopped.

  The test item was observed to decompose from approximately 125 °C (398 K).

 

  Discussion:

The thermal analysis temperature has been reported as the definitive result, as it represents the worst case scenario with respect to thermal stability. Also, the procedure utilized a constant heating rate and has the potential to detect thermal decomposition which does not result in a change in the appearance of the sample.

 

The determination performed under nitrogen atmosphere suggests that the test item decomposition is not of a purely oxidative nature.

 

Conclusions:

Under study conditions, no determination of the boiling temperature was possible, as the test substance decomposed from approximately 94.6 °C (368 K) at 101 kPa.

Executive summary:

A study was conducted to determine the boiling point of the test substance, trichloro(N,N-dimethyloctylamine)boron using the differential scanning calorimetry (DSC) and a modified capillary method according to OECD Guideline 102 and EU method A.2 in compliance with GLP. An aliquot of test substance was placed in a test tube. The test tube was then attached directly to a thermometer and the apparatus was heated by means of a silicon oil bath. The oil bath was heated and stirred throughout the determination using an electric heating mantle. The time of observations, temperature and appearance of the test item were recorded. Under study conditions, no determination of the boiling temperature was possible, as the test substance decomposed from approximately 94.6 °C (368 K) at 101 kPa (Harlan. 2014).

 

Description of key information

The boiling point was determined using the differential scanning calorimetry (DSC) and a modified capillary method according to OECD Guideline 102 and EU method A.2 (Harlan, 2014). 

Additional information

The test substance decomposed from approximately 94.6°C at 101 kPa.