摘要
研究了钍的新试剂二溴邻硝基偶氮胂(DBONA)的纯化方法和性质。测定的其离解常数(pK_a)、质子化常数(logK_p)分别为10.17和-4.75。求得钍络合物的组成为1:2,其积累稳定常数为27.98。
Dibromo-o-nitro-arsenazo(DBONA),a
new chromogenic reagent for thorium was
synthesized and purified by extraction with a
mixture of organic solvents.The dissociation
constant(pK_a) of the first hydroxyl group on
naphthalene ring in basic region and the
protonation constant (logK_p) of DBONA in
acidic medium were determined to be 10.17
and -4.75 respectively.The 1:2 thorium-
DBONA complex formed in an excess of rea-
gent is very stable in acidic medium,it gives
a maximum absorption at 630nm with an
overall stability constant (logK_s) of 27.98.
出处
《化学试剂》
CAS
CSCD
北大核心
1993年第5期257-258,共2页
Chemical Reagents
关键词
偶氮胂
离解常数
钍
络合物
dibromo-o-nitro-arsenazo
dissociation constant
protonation constant
thorium complex
stability constant
