Co7Ge4 crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded in a 11-coordinate geometry to one Co(1), one Co(2), three equivalent Co(4), three equivalent Ge(1), and three equivalent Ge(2) atoms. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Co(1), one Co(2), three equivalent Co(3), three equivalent Co(4), three equivalent Ge(1), and three equivalent Ge(3) atoms. In the third Co site, Co(3) is bonded to six equivalent Co(2), two equivalent Ge(1), and three equivalent Ge(3) atoms to form distorted face-sharing CoCo6Ge5 trigonal bipyramids. In the fourth Co site, Co(4) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Co(2), one Ge(2), one Ge(3), and three equivalent Ge(1) atoms. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to one Co(3), three equivalent Co(1), three equivalent Co(2), and three equivalent Co(4) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Co(4) and six equivalent Co(1) atoms. In the third Ge site, Ge(3) is bonded in a 11-coordinate geometry to two equivalent Co(4), three equivalent Co(3), and six equivalent Co(2) atoms.
Co7Ge4 crystallizes in the hexagonal P-6m2 space group. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded in a 11-coordinate geometry to one Co(1), one Co(2), three equivalent Co(4), three equivalent Ge(1), and three equivalent Ge(2) atoms. The Co(1)-Co(1) bond length is 2.35 Å. The Co(1)-Co(2) bond length is 2.51 Å. All Co(1)-Co(4) bond lengths are 2.55 Å. All Co(1)-Ge(1) bond lengths are 2.68 Å. All Co(1)-Ge(2) bond lengths are 2.57 Å. In the second Co site, Co(2) is bonded in a 14-coordinate geometry to one Co(1), one Co(2), three equivalent Co(3), three equivalent Co(4), three equivalent Ge(1), and three equivalent Ge(3) atoms. The Co(2)-Co(2) bond length is 2.57 Å. All Co(2)-Co(3) bond lengths are 2.62 Å. All Co(2)-Co(4) bond lengths are 2.67 Å. All Co(2)-Ge(1) bond lengths are 2.53 Å. All Co(2)-Ge(3) bond lengths are 2.62 Å. In the third Co site, Co(3) is bonded to six equivalent Co(2), two equivalent Ge(1), and three equivalent Ge(3) atoms to form distorted face-sharing CoCo6Ge5 trigonal bipyramids. Both Co(3)-Ge(1) bond lengths are 2.38 Å. All Co(3)-Ge(3) bond lengths are 2.28 Å. In the fourth Co site, Co(4) is bonded in a 11-coordinate geometry to three equivalent Co(1), three equivalent Co(2), one Ge(2), one Ge(3), and three equivalent Ge(1) atoms. The Co(4)-Ge(2) bond length is 2.31 Å. The Co(4)-Ge(3) bond length is 2.66 Å. All Co(4)-Ge(1) bond lengths are 2.30 Å. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to one Co(3), three equivalent Co(1), three equivalent Co(2), and three equivalent Co(4) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Co(4) and six equivalent Co(1) atoms. In the third Ge site, Ge(3) is bonded in a 11-coordinate geometry to two equivalent Co(4), three equivalent Co(3), and six equivalent Co(2) atoms.