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Two missing compounds within the binary K-Se system have been synthesized and structurally characterized by means of single-crystal diffraction.  β -K 2 Se 2  comprises cell parameters that are in line with predictions made from the series  α / β -A 2 Ch x . K 2 Se 4 , in contrast, incorporates “Se 5  2– ” chains with 50% occupation of the terminal selenium atoms, and has been synthesized on a rather unconventional solvothermal pathway employing successively mercury and ethylene dithiol as solvents.

β -K 2 Se 2 and K 2 Se 4 : missing links in the binary system K-Se