Polymorphs and Solvates of 2-(1,4-Dihydro-1,4-dioxonaphthalen-3-ylthio)benzoic Acid
摘要:
Three conformational polymorphs of 2-(1,4-dihydro-1,4-dioxonaphthalen-3-ylthio) benzoic acid (L), an acetonitrile solvate of L, and cocrystal of L with 2,2'-bipyridine are structurally characterized. The two polymorphs I and II have Z' = 1 and possess R-2(2)(8) type of dimeric structure in which the two aromatic rings are in trans disposition across the cyclic hydrogen bonded motifs. However, the dihedral angles between the aromatic ring and 2-methyl 1,4-naphthoquinone rings are -129.38 degrees and 126.56 degrees, respectively. The polymorph III has Z' = 2; it shows R-2(2)(8) type of dimeric structures which are formed by two symmetry independent molecules. In its crystal lattice, the aromatic rings across the cyclic hydrogen bond motifs are in cis dispositions. Dihedral angles between the aromatic ring and 2-methyl 1,4-naphthoquinone ring in the two symmetry independent molecules are 114.82 degrees and 125.27 degrees, respectively. The acetonitrile solvate of 1 has Z' = 3. In its crystal lattice, it has two symmetry independent molecules forming R-2(2)(8) hydrogen bonds to form dimeric assemblies and another cyclic R-2(2)(8) type hydrogen bond geometry between molecules which constitute the third set of symmetry independent molecules. The 2-(1,4-dihydro-1,4-dioxonaphthalen-3-ylthio)benzoic acid also forms a 2:1 cocrystal with 2,2'-bipyridine; in this cocrystal the two nitrogen atoms are trans to each other and they participate in hydrogen bonds with carboxylic acids.
Polymorphs and Solvates of 2-(1,4-Dihydro-1,4-dioxonaphthalen-3-ylthio)benzoic Acid
摘要:
Three conformational polymorphs of 2-(1,4-dihydro-1,4-dioxonaphthalen-3-ylthio) benzoic acid (L), an acetonitrile solvate of L, and cocrystal of L with 2,2'-bipyridine are structurally characterized. The two polymorphs I and II have Z' = 1 and possess R-2(2)(8) type of dimeric structure in which the two aromatic rings are in trans disposition across the cyclic hydrogen bonded motifs. However, the dihedral angles between the aromatic ring and 2-methyl 1,4-naphthoquinone rings are -129.38 degrees and 126.56 degrees, respectively. The polymorph III has Z' = 2; it shows R-2(2)(8) type of dimeric structures which are formed by two symmetry independent molecules. In its crystal lattice, the aromatic rings across the cyclic hydrogen bond motifs are in cis dispositions. Dihedral angles between the aromatic ring and 2-methyl 1,4-naphthoquinone ring in the two symmetry independent molecules are 114.82 degrees and 125.27 degrees, respectively. The acetonitrile solvate of 1 has Z' = 3. In its crystal lattice, it has two symmetry independent molecules forming R-2(2)(8) hydrogen bonds to form dimeric assemblies and another cyclic R-2(2)(8) type hydrogen bond geometry between molecules which constitute the third set of symmetry independent molecules. The 2-(1,4-dihydro-1,4-dioxonaphthalen-3-ylthio)benzoic acid also forms a 2:1 cocrystal with 2,2'-bipyridine; in this cocrystal the two nitrogen atoms are trans to each other and they participate in hydrogen bonds with carboxylic acids.