PrH7(CO)8CHO crystallizes in the triclinic P-1 space group. The structure consists of two methanol molecules inside a PrH7(CO)8 framework. In the PrH7(CO)8 framework, Pr(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and one O(9) atom. The Pr(1)-O(1) bond length is 2.47 Å. The Pr(1)-O(2) bond length is 2.51 Å. The Pr(1)-O(3) bond length is 2.48 Å. The Pr(1)-O(4) bond length is 2.56 Å. The Pr(1)-O(6) bond length is 2.37 Å. The Pr(1)-O(7) bond length is 2.45 Å. The Pr(1)-O(8) bond length is 2.54 Å. The Pr(1)-O(9) bond length is 2.52 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(3) atom. The C(1)-C(2) bond length is 1.49 Å. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.29 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(7) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(4) atom. The C(3)-H(4) bond length is 1.09 Å. In the fourth C site, C(5) is bonded in a distorted single-bond geometry to one C(6) and one H(5) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(5) bond length is 1.09 Å. In the fifth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.40 Å. The C(6)-C(8) bond length is 1.50 Å. In the sixth C site, C(7) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one H(6) atom. The C(7)-H(6) bond length is 1.09 Å. In the seventh C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(6), and one O(7) atom. The C(8)-O(6) bond length is 1.28 Å. The C(8)-O(7) bond length is 1.27 Å. In the eighth C site, C(9) is bonded in a bent 120 degrees geometry to one O(8) and one O(9) atom. The C(9)-O(8) bond length is 1.28 Å. The C(9)-O(9) bond length is 1.25 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.99 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(4) and one O(8) atom. The H(2)-O(4) bond length is 1.01 Å. The H(2)-O(8) bond length is 1.66 Å. In the third H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to one C(7) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one O(2) atom. The H(7)-O(2) bond length is 0.99 Å. In the seventh H site, H(8) is bonded in a single-bond geometry to one O(2) atom. The H(8)-O(2) bond length is 0.99 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Pr(1) and one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Pr(1), one H(7), and one H(8) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Pr(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Pr(1), one H(1), and one H(2) atom. In the fifth O site, O(6) is bonded in a distorted linear geometry to one Pr(1) and one C(8) atom. In the sixth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Pr(1) and one C(8) atom. In the seventh O site, O(8) is bonded in a 3-coordinate geometry to one Pr(1), one C(9), and one H(2) atom. In the eighth O site, O(9) is bonded in a distorted single-bond geometry to one Pr(1) and one C(9) atom. Linkers: 2 [O]C(=O)c1cc(O)cc(C([O])=O)c1 ,1 [O]C(=O)C([O])=O. Metal clusters: 2 [Pr]. RCSR code: tcs. The MOF has largest included sphere 2.21 A, density 2.29 g/cm3, surface area 2800.87 m2/g, accessible volume 0.09 cm3/g