Tetramethyl anthracene-2,3,6,7-tetracarboxylate–tetramethyl 9,10-dihydro-9,10-dioxoanthracene-2,3,6,7-tetracarboxylate (1/1)1
نویسندگان
چکیده
In the title co-crystal, C(22)H(16)O(10)·C(22)H(18)O(8), the independent tetra-methyl 9,10-dihydro-9,10-dioxoanthracene-2,3,6,7-tetra-carboxyl-ate, (I), and tetra-methyl anthracene-2,3,6,7-tetra-carboxyl-ate, (II), components occupy separate crystallographic inversion centers. In (II), the dihedral angles between the mean aromatic plane and the two independent carboxyl-ate planes are 41.32 (10) and -38.35 (10)°. The methyl-carboxyl-ate groups of (I) are disordered, with each resolvable into two groups. In the least disordered carboxyl-ate, the apparent angles between the mean aromatic plane and the two partial carboxyl-ate planes [site occupations = 0.510 (3) and 0.490 (3)] are 16.8 (3) and 23.3 (3)°. In the highly disordered group, the apparent angles between the mean aromatic plane and the two partial carboxyl-ate planes [site occupations = 0.510 (3) and 0.490 (3)] are 78.3 (3) and -74.1 (3)°. In addition, this extreme disorder leads to an artificially elongated C(aromatic)-C(carbox-yl) bond.
منابع مشابه
Redetermination of tetramethyl tetrathiafulvalene-2,3,6,7-tetracarboxylate
An improved crystal structure of the title compound, C(14)H(12)O(8)S(4), is reported. The structure, previously solved using the heavy-atom method (R = 7.1%), has now been solved using direct methods. Due to the improved quality of the data set an R value of 2.06% could be achieved. In the crystal, C-H⋯S and C-H⋯O contacts link the mol-ecules.
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