GaC8H5O5 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(5), one O(6), one O(7), one O(8), and two equivalent O(1) atoms to form corner-sharing GaO6 octahedra. The corner-sharing octahedral tilt angles are 59°. The Ga(1)-O(5) bond length is 2.00 Å. The Ga(1)-O(6) bond length is 2.01 Å. The Ga(1)-O(7) bond length is 2.03 Å. The Ga(1)-O(8) bond length is 2.04 Å. There is one shorter (1.94 Å) and one longer (1.95 Å) Ga(1)-O(1) bond length. In the second Ga site, Ga(2) is bonded to two equivalent O(10), two equivalent O(2), and two equivalent O(4) atoms to form corner-sharing GaO6 octahedra. The corner-sharing octahedral tilt angles are 59°. Both Ga(2)-O(10) bond lengths are 2.03 Å. Both Ga(2)-O(2) bond lengths are 1.94 Å. Both Ga(2)-O(4) bond lengths are 2.01 Å. In the third Ga site, Ga(3) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(9) atoms to form corner-sharing GaO6 octahedra. The corner-sharing octahedral tilt angles are 59°. Both Ga(3)-O(2) bond lengths are 1.94 Å. Both Ga(3)-O(3) bond lengths are 2.02 Å. Both Ga(3)-O(9) bond lengths are 2.02 Å. There are sixteen inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.40 Å. The C(1)-C(7) bond length is 1.49 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1); one C(3); and one H(1,3) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(1,3) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2); one C(4); and one H(2,4) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(2,4) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(8) bond length is 1.49 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4); one C(6); and one H(1,3) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(1,3) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(1); one C(5); and one H(2,4) atom. The C(6)-H(2,4) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.28 Å. The C(7)-O(4) bond length is 1.28 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(5), and one O(6) atom. The C(8)-O(5) bond length is 1.28 Å. The C(8)-O(6) bond length is 1.28 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(14), and one C(15) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-C(14) bond length is 1.40 Å. The C(9)-C(15) bond length is 1.50 Å. In the tenth C site, C(10) is bonded in a distorted trigonal planar geometry to one C(11), one C(9), and one H(5) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-H(5) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a distorted trigonal planar geometry to one C(10), one C(12), and one H(6) atom. The C(11)-C(12) bond length is 1.40 Å. The C(11)-H(6) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(16) atom. The C(12)-C(13) bond length is 1.40 Å. The C(12)-C(16) bond length is 1.49 Å. In the thirteenth C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(14), and one H(7) atom. The C(13)-C(14) bond length is 1.39 Å. The C(13)-H(7) bond length is 1.09 Å. In the fourteenth C site, C(14) is bonded in a distorted trigonal planar geometry to one C(13), one C(9), and one H(8) atom. The C(14)-H(8) bond length is 1.09 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(7), and one O(8) atom. The C(15)-O(7) bond length is 1.28 Å. The C(15)-O(8) bond length is 1.28 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(10), and one O(9) atom. The C(16)-O(10) bond length is 1.28 Å. The C(16)-O(9) bond length is 1.28 Å. There are eight inequivalent H sites. In the first H site, H(1,3) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2,4) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(5) is bonded in a single-bond geometry to one C(10) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one C(11) atom. In the fifth H site, H(7) is bonded in a single-bond geometry to one C(13) atom. In the sixth H site, H(8) is bonded in a single-bond geometry to one C(14) atom. In the seventh H site, H(9) is bonded in a single-bond geometry to one O(1) atom. The H(9)-O(1) bond length is 0.97 Å. In the eighth H site, H(10) is bonded in a single-bond geometry to one O(2) atom. The H(10)-O(2) bond length is 0.97 Å. There are ten inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Ga(1) and one C(8) atom. In the second O site, O(6) is bonded in a bent 120 degrees geometry to one Ga(1) and one C(8) atom. In the third O site, O(7) is bonded in a bent 120 degrees geometry to one Ga(1) and one C(15) atom. In the fourth O site, O(8) is bonded in a bent 120 degrees geometry to one Ga(1) and one C(15) atom. In the fifth O site, O(9) is bonded in a bent 120 degrees geometry to one Ga(3) and one C(16) atom. In the sixth O site, O(10) is bonded in a bent 120 degrees geometry to one Ga(2) and one C(16) atom. In the seventh O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Ga(1) and one H(9) atom. In the eighth O site, O(2) is bonded in a distorted trigonal planar geometry to one Ga(2), one Ga(3), and one H(10) atom. In the ninth O site, O(3) is bonded in a bent 120 degrees geometry to one Ga(3) and one C(7) atom. In the tenth O site, O(4) is bonded in a bent 120 degrees geometry to one Ga(2) and one C(7) atom. Linkers: 8 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 8 [Ga]. The MOF has largest included sphere 1.85 A, density 2.00 g/cm3, surface area 3162.86 m2/g, accessible volume 0.15 cm3/g