title: Three polar derivatives of N-ethylcarbazole: materials for optical applications.
abstract: Three N-ethylcarbazole derivatives have been synthesized and tested for non-linear optical (NLO) properties. The compounds are 2-(9-ethyl-9H-carbazol-3-ylmethylene)malononitrile, C(18)H(13)N(3), (IIIa), 2-cyano-3-(9-ethyl-9H-carbazol-3-yl)thioacrylamide, C(18)H(15)N(3)S, (IIIb), and 3-(9-ethyl-9H-carbazol-3-yl)-2-(4-phenyl-1,3-thiazol-2-yl)acrylonitrile, C(26)H(19)N(3)S, (V). It was found that the molecules of (IIIa) and (V) are nearly planar, while non-planarity is more pronounced for (IIIb). Molecules of (IIIa) and (V) exhibit herring-bone packing motifs. In (IIIb), the molecules form layers coplanar with (-201), within which they form centrosymmetric dimers via N-H...S hydrogen bonds.
authors.affiliation: Department of Chemistry, New Mexico Highlands University, Las Vegas, NM 87701, USA. vlad@kremlin.nmhu.edu
authors.forename: Vladimir N
authors.initials: VN
authors.lastname: Nesterov
authors.forename: Nicole G
authors.initials: NG
authors.lastname: Montoya
authors.forename: Mikhail Yu
authors.initials: MY
authors.lastname: Antipin
authors.forename: Mohan
authors.initials: M
authors.lastname: Sanghadasa
authors.forename: Ronald D
authors.initials: RD
authors.lastname: Clark
authors.forename: Tatiana V
authors.initials: TV
authors.lastname: Timofeeva