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EC number: 221-336-6
CAS number: 3069-29-2
[N-[3-(dimethoxymethylsilyl)propyl]ethylenediamine]: not relevant due to
very rapid hydrolysis in contact with water
Dissociation constant [di-amine
group for parent and silanol hydrolysis product]: pKa approximately 10
[dihydroxysilyl group of
N-[3-(dihydroxymethylsilyl)propyl]ethylenediamine]: pKa approximately 12
The requirement to test the
substance for dissociation constant is waived because in contact with
water the substance hydrolyses very rapidly. The hydrolysis products in
this case are N-[3-(dihydroxymethylsilyl)propyl]ethylenediamine and
methanol. There are no reliable measured data for the dissociation
constant of the parent substance or hydrolysis product.
The amine groups in the
parent substance and silanol hydrolysis products are basic and will gain
a proton in aqueous solution to give a positively charged (cationic)
species The dissociation constants of the di-amine group have been
calculated using an appropriate predictive method to be approximately 7
and approximately 10. This means that they are present as a mixture of
the singly and doubly ionised (cationic) forms at environmentally
The typical dissociation constants
for the hydroxyl protons of silanediols are available from studies in
other silanediols. It is appropriate to read-across dissociation
constant data for N-[3-(dihydroxymethylsilyl)propyl]ethylenediamine from
dimethylsilanediol. This suggests that silanols are not expected to
undergo significant dissociation within the range of pH relevant in the
environment or in vivo. Dimethylsilanediol is reported in a
secondary source to have a first dissociation constant of 11.9.
Additional information is given in
a supporting report (PFA 2013b) attached in Section 13.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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