HgH8(C2N)4 crystallizes in the triclinic P-1 space group. Hg(1) is bonded in a 4-coordinate geometry to one N(1), one N(2), one N(3), and one N(4) atom. The Hg(1)-N(1) bond length is 2.55 Å. The Hg(1)-N(2) bond length is 2.54 Å. The Hg(1)-N(3) bond length is 2.11 Å. The Hg(1)-N(4) bond length is 2.11 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(1)-C(1) bond length is 1.45 Å. The C(1)-C(3) bond length is 1.41 Å. The C(1)-C(5) bond length is 1.41 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(6) atom. The C(2)-C(2) bond length is 1.45 Å. The C(2)-C(4) bond length is 1.41 Å. The C(2)-C(6) bond length is 1.41 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(1), and one H(1) atom. The C(3)-N(1) bond length is 1.34 Å. The C(3)-H(1) bond length is 1.08 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(2), and one H(2) atom. The C(4)-N(2) bond length is 1.34 Å. The C(4)-H(2) bond length is 1.08 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(1), one C(7), and one N(3) atom. The C(5)-C(7) bond length is 1.49 Å. The C(5)-N(3) bond length is 1.36 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(2), one C(8), and one N(4) atom. The C(6)-C(8) bond length is 1.49 Å. The C(6)-N(4) bond length is 1.36 Å. In the seventh C site, C(7) is bonded in a distorted trigonal non-coplanar geometry to one C(5), one H(3), one H(5), and one H(7) atom. The C(7)-H(3) bond length is 1.10 Å. The C(7)-H(5) bond length is 1.10 Å. The C(7)-H(7) bond length is 1.10 Å. In the eighth C site, C(8) is bonded in a distorted trigonal non-coplanar geometry to one C(6), one H(4), one H(6), and one H(8) atom. The C(8)-H(4) bond length is 1.10 Å. The C(8)-H(6) bond length is 1.10 Å. The C(8)-H(8) bond length is 1.10 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one Hg(1), one C(3), and one N(3) atom. The N(1)-N(3) bond length is 1.36 Å. In the second N site, N(2) is bonded in a distorted single-bond geometry to one Hg(1), one C(4), and one N(4) atom. The N(2)-N(4) bond length is 1.35 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Hg(1), one C(5), and one N(1) atom. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one Hg(1), one C(6), and one N(2) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(7) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(8) atom. Linkers: 1 CC1=NN=C[C]1C1=C(C)N=N[CH]1 ,1 C[C]1N=NC=C1C1=C(C)N=N[CH]1. Metal clusters: 2 [Hg]. The MOF has largest included sphere 2.81 A, density 2.72 g/cm3, surface area 2742.09 m2/g, accessible volume 0.08 cm3/g