Crystal structure determination as part of an undergraduate laboratory experiment: 1′3′3′-tri­methyl­spiro­chromene-22′-indoline and 1′3′3′-trimethyl-4-(E)-(133-tri­methyl­indolin-2-yl­idene)meth­ylspiro­chroman-22′-indoline

摘要

The crystal structures of the title compounds, C19H19NO and C31H34N2O, were determined as part of an experiment in an undergraduate teaching laboratory that demonstrates the relationship between mol­ecular structure and function. 1′,3′,3′-Tri­methyl­spiro­[chromene-2,2′-indoline] is both a photoswitch and thermochromic mol­ecule. Students synthesized it and a bis-indoline adduct and compared the crystallographically determined structures to computed gas-phase models.