title: Crystal structure determination as part of an undergraduate laboratory experiment: 1',3',3'-tri-methyl-spiro-[chromene-2,2'-indoline] and 1',3',3'-trimethyl-4-[(E)-(1,3,3-tri-methyl-indolin-2-yl-idene)meth-yl]spiro-[chroman-2,2'-indoline].
abstract: 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 mol-ecular structure and function. 1',3',3'-Tri-methyl-spiro-[chromene-2,2'-indoline] is both a photoswitch and thermochromic mol-ecule. Students synthesized it and a bis-indoline adduct and compared the crystallographically determined structures to computed gas-phase models.
authors.affiliation: Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
authors.forename: Joseph O S
authors.initials: JO
authors.lastname: Beckett
authors.affiliation: Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
authors.forename: Marilyn M
authors.initials: MM
authors.lastname: Olmstead
authors.affiliation: Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
authors.forename: James C
authors.initials: JC
authors.lastname: Fettinger
authors.affiliation: Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
authors.forename: David A
authors.initials: DA
authors.lastname: Gray
authors.affiliation: Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
authors.forename: Shuhei
authors.initials: S
authors.lastname: Manabe
authors.affiliation: Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: Mascal
keywords: crystal structure; spiro­pyran; undergraduate teaching laboratory