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Single crystals of CuSm3Se6 develop by reaction of the elements (Cu, Sm and Se; molar ratio: 1:3:6) after 7 days at 973K. As the formula indicates, the crystal structure of CuSm3Se4[Se2] (orthorhombic, Pbcm; a=709.53(6), b=783.91(7), c=1689.98(9)pm, Z=4) contains both mono- (Se2−) and diselenide anions ([Se2]2−). The latter are surrounded by six Sm3+ cations. If the diselenide units serve as one fragment,...
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