Potassium selenocyanate

Potassium selenocyanate is the inorganic compound with the formula KSeCN. It is a hygroscopic white solid that is soluble in water, decomposing in air to red selenium and potassium cyanide. The compound has been characterized by X-ray crystallography, which confirms that it is a salt. The C-N and C-Se distances are 1.12 and 1.83, respectively, consistent with triple and single bonds. 
It serves as a source of Se0, e.g., in its reaction with triphenylphosphine to give triphenylphosphine selenide.