Crystal structure of 3-[4-(1,1-dimethylethyl)phenyl]-2,5-dihydro-6- phenylpyrrolo[3,4-c]pyrrole-1,4-dione, C22H20N2O2, at 93 Κ

Crystal structure of 3,6-diphenylpyrrolo[3,4-c]pyrrole-l,4-dione–3,6-bis(4-tert-butylphenyl)-2,5-dihydropyrrolo[3,4-c]pyrrole-l,4-dione (1:1), ( C18H12N2O2 ) · ( C26H28N2O2 )

“…The present coincidence of these physical properties is of great scientific interest and also of industrial interest, because the color specified by expensive MTB-DPP (due to the synthesis of asymmetrical molecules) can be achieved by inexpensive DPP and BTB-DPP (due to the synthesis of symmetrical molecules). Previously, we have reported the crystal structure of MTB-DPP [7], This shows that there is a NH-0 hydrogen bond network and the molecules are arranged in a fashion "bricks in a brick wall". In addition, the r-butyl group of MTB-DPP faces the phenyl ring of the neighboring one.…”

Crystal structure of 3,6-diphenylpyrrolo[3,4-c]pyrrole-1,4-dione—3,6- bis(4-tert-butylphenyl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (1:1), (C18H12N2O2) · (C26H28N2O2)

“…The two phenyl rings on each side of the heterocyclic ring system are twisted symmetrically in the same direction: 13°in DPP and 11°i n BTB-DPP with respect to the heterocyclic system. The both molecules are stacked alternately in a fashion "bricks in a brick wall" just as found in MTB-DPP [7]. On each molecular plane of DPP and BTB-DPP, there are chains of intermolecular hydrogen bonds between the NH group of one molecule and the O atom of the neighboring one.…”

“…The present coincidence of these physical properties is of great scientific interest and also of industrial interest, because the color specified by expensive MTB-DPP (due to the synthesis of asymmetrical molecules) can be achieved by inexpensive DPP and BTB-DPP (due to the synthesis of symmetrical molecules). Previously, we have reported the crystal structure of MTB-DPP [7]. This shows that there is a NH···O hydrogen bond network and the molecules are arranged in a fashion "bricks in a brick wall".…”

“…bond network as found in all pyrrolopyrrole pigments [4,5,[7][8][9][10] and causes the very good thermal and solvent resistance of the hydrogen bonded DPP pigments. In addition, the t-butyl group of one BTB-DPP molecule faces the phenyl ring of the neighboring DPP molecule in the lattice plane (bottom figure) as observed exactly in MTB-DPP.…”

Crystal structure of 5,12-dihydro-2,9-dimethylquino[2,3-b]acridine-7,14- dione, C22H16N2O2, at 123 Κ

“…The molecule is entirely planar and belongs to the point group of C,·. There are intermolecular hydrogen bonds between the NH group of one molecule and the O atom of the neighboring one, forming a two-dimensional hydrogen bond network as found in the β phase of unsubstituted quinacridone [5] and also in all pyrrolopyrrole pigments [6][7][8][9][10][11][12][13][14][15]. Each molecule is hydrogen-bonded to two molecules.…”