Platinocyanide, also known as tetracyanoplatinate (IUPAC), cyanoplatinate, or platinocyanate, is a
polyatomic ion
A polyatomic ion (also known as a molecular ion) is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that usually has a net charge that is not zero, or in special c ...
with the
molecular formula t(CN)4sup>2−. The name also applies to compounds containing this ion, which are
salt
In common usage, salt is a mineral composed primarily of sodium chloride (NaCl). When used in food, especially in granulated form, it is more formally called table salt. In the form of a natural crystalline mineral, salt is also known as r ...
s of the
hypothetical platinocyanic acid (sometimes platinocyanhydric acid).
Barium platinocyanide, Ba
t(CN)4is a
phosphor
A phosphor is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or phosphorescent substances which glow on exposure to ultraviolet or ...
and a
scintillator. It fluoresces green in the presence of x-rays and gamma rays. It was important in the discovery of
X-ray
An X-ray (also known in many languages as Röntgen radiation) is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays. Roughly, X-rays have a wavelength ran ...
s, and in the development of the
fluoroscope.
One platinocyanide salt,
Krogmann's salt (dipotassium tetracyanoplatinate bromide trihydrate), has unusually high electric conductance.
Cyano complexes
Phosphors and scintillators
Cyanides
Cyanometallates
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