CuBH20(C2N)8 crystallizes in the cubic P-43n space group. Cu(1) is bonded in a tetrahedral geometry to four equivalent N(1) atoms. All Cu(1)-N(1) bond lengths are 2.02 Å. B(1) is bonded in a tetrahedral geometry to four equivalent N(2) atoms. All B(1)-N(2) bond lengths are 1.55 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(2), and one H(1) atom. The C(1)-C(2) bond length is 1.37 Å. The C(1)-N(2) bond length is 1.39 Å. The C(1)-H(1) bond length is 1.08 Å. In the second C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(3), one H(3), one H(4), and one H(5) atom. The C(4)-C(3) bond length is 1.49 Å. The C(4)-H(3) bond length is 1.10 Å. The C(4)-H(4) bond length is 1.10 Å. The C(4)-H(5) bond length is 1.10 Å. In the third C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(1), and one H(2) atom. The C(2)-N(1) bond length is 1.38 Å. The C(2)-H(2) bond length is 1.08 Å. In the fourth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one N(2) atom. The C(3)-N(1) bond length is 1.34 Å. The C(3)-N(2) bond length is 1.38 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Cu(1), one C(2), and one C(3) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one B(1), one C(1), and one C(3) atom. There are five inequivalent H sites. In the first H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(5) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the fifth H site, H(3) is bonded in a single-bond geometry to one C(4) atom. Linkers: 6 Cc1nccn1[B](n1ccnc1C)(n1ccnc1C)n1ccnc1C. Metal clusters: 6 [Cu]. The MOF has largest included sphere 10.11 A, density 0.98 g/cm3, surface area 4789.28 m2/g, accessible volume 0.52 cm3/g