The invention relates to a method for producing aqueous preparations of complexes of platinum group metals (PGM) Pt, Pd, Rh and Ir having the general formula [M
A
/M
B
/M
C
(L)
a
(H
2
O)
b
(O
2
—)
c
(OH
−
)
d]
(OH—)
e
(H
+
)
f
, wherein M
A
=Pt
II
or Pd
II
, M
B
=Pt
IV
, M
C
=Rh or Ir, L is a neutral monodentate or bidentate donor ligand, and a is an integer between 1 and 4 (or 2) and/or between 1 and 6 (or 3), b is an integer between 0 and 3 (or 5), c is an integer between 0 and 3 (or 4), d is an integer between 0 and 3 (or 5), e is an integer between 0 and 2 (or 3 or 4) and f is an integer between 0 and 4 (or 5). In the method according to the invention, the hydroxo complexes H
2
P
d
(OH)
4
(in the case of M
A
=Pd
II
), H
2
Pt(OH)
6
(in the case of M
A
=Pt
II
and M
B
=Pt
IV
) or H
3
M
C
(OH)
6
(for M
C
=Rh
III
Ir
III
) are converted in the presence of the donor ligands, wherein at least one hydroxo group of the hydro complex is exchanged. Preferably, the reaction occurs at temperatures in the range of 40 to 110° C. with a reaction time of between 2 and 24 hours, wherein, where MA=PtII, the conversion additionally occurs in the presence of a reduction agent. The method optionally further comprises an exchange of OH anions bound outside of the complex sphere with other anions (e.g. hydrogen carbonate or carbonate anions). The aqueous preparations contain PGM complexes such as [Pt(en)
2
](OH)
2
, [Pt(EA)
4
](OH)
2
or [Rh(NH
3
)
6
](OH)
3
and are used to produce electroplating baths, heterogeneous catalysts or metal powders, for example.
本发明涉及一种制备
铂族
金属(
PGM)Pt、Pd、Rh和Ir的
水溶性配合物的方法,其通式为[MA/MB/MC(L)a(
H2O)b(O2—)c(OH−)d](OH—)e(H+)f,其中MA=PtII或PdII,MB=PtIV,MC=Rh或Ir,L是中性的单齿或双齿供体
配体,a是1到4(或2)之间的整数和/或1到6(或3)之间的整数,b是0到3(或5)之间的整数,c是0到3(或4)之间的整数,d是0到3(或5)之间的整数,e是0到2(或3或4)之间的整数,f是0到4(或5)之间的整数。在本发明的方法中,在供体
配体的存在下,将羟基配合物
H2Pd(OH)4(当MA=PdII时),
H2Pt(OH)6(当MA=PtII且MB=PtIV时)或H3MC(OH)6(对于MC=RhIIIIrIII)转化,其中至少一个羟基配合物被交换。优选地,反应在40至110°C的温度范围内进行,反应时间为2至24小时,在MA=PtII的情况下,还在还原剂的存在下进行转化。该方法还可选地进一步包括将配合物球外结合的OH阴离子与其他阴离子(例如氢
碳酸盐或
碳酸盐阴离子)进行交换。
水溶性制剂包含
PGM配合物,例如[Pt(en)2](OH)2,[Pt(EA)4](OH)2或[Rh(NH3)6](OH)3,并用于制备电镀浴、异相催化剂或
金属粉末等。