Re3N5 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form ReN4 tetrahedra that share corners with two equivalent Re(1)N4 tetrahedra and corners with four equivalent Re(2)N5 trigonal bipyramids. In the second Re site, Re(2) is bonded to two equivalent N(2) and three equivalent N(3) atoms to form distorted ReN5 trigonal bipyramids that share corners with two equivalent Re(1)N4 tetrahedra, corners with four equivalent Re(2)N5 trigonal bipyramids, and edges with two equivalent Re(2)N5 trigonal bipyramids. There are three inequivalent N sites. In the first N site, N(1) is bonded in a water-like geometry to two equivalent Re(1) atoms. In the second N site, N(2) is bonded in a distorted T-shaped geometry to one Re(1) and two equivalent Re(2) atoms. In the third N site, N(3) is bonded in a distorted T-shaped geometry to three equivalent Re(2) atoms.
Re3N5 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form ReN4 tetrahedra that share corners with two equivalent Re(1)N4 tetrahedra and corners with four equivalent Re(2)N5 trigonal bipyramids. Both Re(1)-N(1) bond lengths are 1.86 Å. Both Re(1)-N(2) bond lengths are 1.88 Å. In the second Re site, Re(2) is bonded to two equivalent N(2) and three equivalent N(3) atoms to form distorted ReN5 trigonal bipyramids that share corners with two equivalent Re(1)N4 tetrahedra, corners with four equivalent Re(2)N5 trigonal bipyramids, and edges with two equivalent Re(2)N5 trigonal bipyramids. Both Re(2)-N(2) bond lengths are 2.03 Å. There is one shorter (1.87 Å) and two longer (2.03 Å) Re(2)-N(3) bond lengths. There are three inequivalent N sites. In the first N site, N(1) is bonded in a water-like geometry to two equivalent Re(1) atoms. In the second N site, N(2) is bonded in a distorted T-shaped geometry to one Re(1) and two equivalent Re(2) atoms. In the third N site, N(3) is bonded in a distorted T-shaped geometry to three equivalent Re(2) atoms.