Enhanced π-Conjugation and Emission via Icosahedral Carboranes: Synthetic and Spectroscopic Investigation
作者:Barada Prasanna Dash、Rashmirekha Satapathy、Elizabeth R. Gaillard、Kathleen M. Norton、John A. Maguire、Neha Chug、Narayan S. Hosmane
DOI:10.1021/ic200010q
日期:2011.6.20
The ability of ortho-, meta- and para-carboranes to enhance the emission intensity has been compared. For this purpose a series of carborane-appended 1,3,5-triphenylbenzene (TB) and 1,3,5- tris(biphenyl-4-yl)benzene (TBB) containing three ortho-, meta- and para-carborane clusters directly attached to the conjugated cores have been synthesized employing Suzuki, Heck, and trimerization reactions. The
Biphenyl-Based Disc- vs. Rod-Shaped Phenylacetylenes: Mesomorphism and Electronic Properties
作者:Gunther Hennrich、Pedro D. Ortiz、Emma Cavero、Robert E. Hanes、José Luis Serrano
DOI:10.1002/ejoc.200800568
日期:2008.9
for the preparation of a C3-symmetric phenylacetylene (2) and the corresponding linear phenylacetylene (3) incorporating terminal biphenyl substituents. The study of the mesomorphic properties of the target compounds, as well as mixtures of both, reveals that only the calamitic biphenylylacetylene 3 forms smectic liquid crystals. Upon investigating the electronic situation of both biphenylylacetylenes
The redox-neutral tetrafluoroethylation of alkynes with 1,1,2,2-tetrafluroroethanesulfonic acid (TFESA) and azobis(isobutyronitrile) (AIBN) proceeds via the formation of vinyl tetrafluoroethanesulfonates followed by a radical tetrafluoroethylation. Experimental and theoretical results support an intermolecular reaction.