Chemistry Reference
In-Depth Information
Fig. 3.11
Portrait of Julius
Nessler (1827-1905)
Ammoniak…
where he described the tetraiodomercurate reagent, which later was
named after him.
He worked with Lambert, Heinrich von Babo and Robert Wilhelm Bunsen and
from 1857 in a chemical plant in Karlsruhe. In 1859, he founded in Karlsruhe an
agricultural research station, which in 1863 became the state-owned
Agricultur
-
chemische Versuchsstation
. This he headed until 1901 (when he was pensioned
aged 74).
Nessler (for portrait see Fig.
3.11
) was appointed Professor in 1870,
Hofrat
(Privy Councilor) in 1879 and
Geheimer Hofrat
in 1889. He earned numerous
awards and honorary memberships of agricultural associations—among others of
the
Deutscher Weinbauverein
(German Association of Winery) in 1901. His pub-
lications have been directed mainly to agriculture (cultivation of wine [
120
] and
tobacco, two textbooks for agricultural colleges [
121
]), but he became most well-
known by the Nessler's Reagent [
122
,
123
]: potassium tetraiodomercurate(II),
K
2
[HgI
4
], which forms with NH
3
the red-brown precipitating dye [Hg
2
N]I, the
iodide of the cation of Millon's base [
124
].
NH
4
+
2K
2
HGI
4
+
3NAOH
+
OH
−
→
HG
2
N
I
↓+
4KI
+
3NAI
+
4H
2
O
For further information see [
125
-
127
].
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