PrCuSe2 crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 7-coordinate geometry to three equivalent Se(2) and four equivalent Se(1) atoms. Cu(1) is bonded to one Se(1) and three equivalent Se(2) atoms to form a mixture of distorted edge and corner-sharing CuSe4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to four equivalent Pr(1) and one Cu(1) atom to form a mixture of distorted edge and corner-sharing SePr4Cu trigonal bipyramids. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to three equivalent Pr(1) and three equivalent Cu(1) atoms.
PrCuSe2 crystallizes in the monoclinic P2_1/c space group. Pr(1) is bonded in a 7-coordinate geometry to three equivalent Se(2) and four equivalent Se(1) atoms. There are a spread of Pr(1)-Se(2) bond distances ranging from 3.01-3.26 Å. There are a spread of Pr(1)-Se(1) bond distances ranging from 2.96-3.05 Å. Cu(1) is bonded to one Se(1) and three equivalent Se(2) atoms to form a mixture of distorted edge and corner-sharing CuSe4 tetrahedra. The Cu(1)-Se(1) bond length is 2.46 Å. There are a spread of Cu(1)-Se(2) bond distances ranging from 2.46-2.63 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to four equivalent Pr(1) and one Cu(1) atom to form a mixture of distorted edge and corner-sharing SePr4Cu trigonal bipyramids. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to three equivalent Pr(1) and three equivalent Cu(1) atoms.