Trimethylvinylsilane

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Determination of trimethylvinylsilane using LC-UV. The method used was based on Reversed Phase chromatography using acetonitrile/water as mobile phase, direct injection with UV detection. The analytical method was developed as part of preliminary work for the purpose of ecotox testing.

GLP compliance:

no

Type of method:

flask method

Test material

Test material information

1

Reference substance name:

Trimethylvinylsilane

EC Number:

212-042-9

EC Name:

Trimethylvinylsilane

Cas Number:

754-05-2

Molecular formula:

C5H12Si

IUPAC Name:

trimethylvinylsilane

Results and discussion

Water solubility

Key result

Remarks on result:

not determinable

Any other information on results incl. tables

Analytical method:

Trimethylvinyl silane could be analyzed by LC-UV. A UV absorbance with sufficient intensity at 200 nm could be established due to the vinyl double bond. The test item was stable during the analytical run with the eluens consisting of 90:10 acetonitrile / water.

Experimental findings:

- Sample 1: Trimethylvinyl silane was stable in acetonitrile. The UV-VIS response showed a loss of 14.9% after 5 hours.

- Sample 2: Trimethylvinyl silane was not stable in contact with water (in the AAP medium). The UV-VIS response showed a loss of 98.3% in 7.5 hours.

- Sample 3: Trimethylvinyl silane was nearly insoluble in water. The UV-VIS response showed that only 15.5% of trimethylvinylsilane could be detected after 0.5h. The UV-VIS response furthermore showed a loss of 79.0% after 7.5 hours.

Mass spectrometry:

The product ion scan showed the [M+H]+ signal at 101 m/z and a fragment ion at 57 m/z.

Interpretation:

It was not possible to determine the water solubility of trimethylvinyl silane.The method yielded reliable chromatograms with UV detection at 200 nm. However, dispensing trimethylvinyl silane in water or medium with a concentration of 200 ppm failed due to the test item's low water solubility. The test item appeared as tiny, oily droplets (visual observation). Furthermore, the test item was not stable in water. A number of possible side reactions were considered:

- Separation of tiny droplets of the test item on the water surface.

- Adsorption of the test item onto the glass surface.

- Evaporation of the test item due to its high volatility.

- Hydrolysis of the test item in contact with water.

Applicant's summary and conclusion

Conclusions:

It was not possible to determine the water solubility of trimethylvinyl silane.

Executive summary:

It was not possible to determine the water solubility of trimethylvinyl silane.The method yielded reliable chromatograms with UV detection at 200 nm. However, dispensing trimethylvinyl silane in water or medium with a concentration of 200 ppm failed due to the test item's low water solubility. The test item appeared as tiny, oily droplets (visual observation). Furthermore, the test item was not stable in water. A number of possible side reactions were considered:

- Separation of tiny droplets of the test item on the water surface.

- Adsorption of the test item onto the glass surface.

- Evaporation of the test item due to its high volatility.

- Hydrolysis of the test item in contact with water.