Mercury selenocyanate

In recent years research in the field of transition-metal thiocyanates and selenocyanates received a new impetus, because of the partly interesting physical properties of such crystalline species. A review on Cd and Hg thiocyanate systems collects and sorts results of this endeavor.371 The nonlinear optical (NLO) properties of Cd thiocyanate and selenocyanate systems and criteria for the design of NLO crystals (crystal engineering), especially, have been discussed afterwards.372 Further contributions to the field have also been described.37, 374 The structure of mercury chlorothiocyanate has been re-determined.375... 

Finely divided free selenium reacts with mercury vapor to produce black mercury selenide. Suitable reagent paper is prepared by soaking filter paper in a solution of potassium selenocyanate (KCNSe), draining, and exposing to an atmosphere of hydrogen chloride (hood ). The potassium selenocyanate solution is readily prepared by vigorously shaking potassium cyanide solution with an excess of pure selenium powder in a stoppered flask. 

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