The reaction of pharmacological active protic ionic liquid
tris-(2-hydroxyethyl)ammonium 4-chlorophenylsulfanylacetate
H+N(CH2CH2OH)3 ∙
(-OOCCH2SC6H4Cl-4) (1)
with zinc or nickel chloride in a ratio of 2:1 affords stable at room
temperature powder-like adducts
[H+N(CH2CH2OH)3]2
∙
[M(OOCCH2SC6H4Cl-4)2Cl2]2-,
M = Zn (2), Ni (3). By recrystallization from aqueous alcohol
compound 2 unexpectedly gives
Zn(OOCCH2SC6H4Cl-4)2 ∙
2H2O (4). Unlike 2, compound 3 gives
crystals
[N(CH2CH2OH)3]2Ni2+ · [-OOCCH2SC6H4Cl-4]2
(5), which have a structure of metallated ionic liquid. The structure
of 5 has been proved by X-ray diffraction analysis. It is the first
example of the conversion of a protic ionic liquid into potentially biological
active metallated ionic liquid
(1 → 3 → 5).