imidacloprid (ISO); 1-(6-chloropyridin-3-ylmethyl)-N-nitroimidazolidin-2-ylidenamine

Boiling point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

11-18 Sep 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling point/boiling range)

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

GLP compliance:

yes (incl. QA statement)

Remarks:

Hessisches Ministerium für Umwelt, Energie, Jugend, Familie und Gesundheit, Wiesbaden, Germany

Type of method:

differential scanning calorimetry

Decomposition:

yes

Decomp. temp.:

> 220 °C

The DSC measurements performed for the determination of the thermal stability (in closed crucibles) and melting point showed that the test item reacted exothermally starting at 220 °C and transformed into a black residue. It was concluded that the test item had no boiling point under atmospheric conditions. The test item decomposed starting at 220 °C.

Reference 2

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

Sep 1996

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

Calculation from the results of the vapour pressure determinations

GLP compliance:

no

Type of method:

other: Calculation from the results of the vapour pressure determinations

Boiling pt.:

> 500 °C

Atm. press.:

ca. 1 013 hPa

Decomposition:

yes

A boiling point of the substance cannot be determined experimentally due to the thermal instability under the conditions of the determination. Extrapolating the vapour pressure curve gives as a result a boiling point well above 500 °C which is in a temperature range where decomposition reactions occur according to thermal stability studies.

Description of key information

> 220 °C at ca. 1013.3 hPa (decomposition)

Additional information

The boiling behaviour of the substance was investigated in accordance with OECD Guideline 103 and EU Method A.2 using differential scanning calorimetry. No endothermic effects were observed between the endothermic transformation process and the temperature where the exothermal decomposition began (ca. 220 °C). Therefore neither the boiling point, nor the boiling range of the substance exists at the atmospheric pressure (1013.3 hPa). In another experiment, based on investigation of temperature-pressure relationship, the theoretical boiling temperature obtained for the ambient pressure was above 500 °C, i.e. in the temperature range where the decomposition occurs according to thermal stability studies.