The crystal structure of a squarylium dye, 2,4-bis[(1-isopropyl-3,3-dimethyl-2-indolinyldene)methyl]cyclobutenediylium-1,3- diolate

The crystal structure of 2,4-bis[(1-isopropyl-3,3-dimethyl-2-indolinyldene)methyl] cyclobutenediylium-1,3-diolate has been determined. It was found that the crystal system is orthorhombic and the space group is Pbca, with a=10.142(3), b=14.146(4), c=22.262(6) A, and Z=8. The molecules have adopted the trans-conformation, and are held together by van de Waal's forces.