Journal
CHIRALITY
Volume 25, Issue 10, Pages 589-599Publisher
WILEY
DOI: 10.1002/chir.22176
Keywords
circular dichroism (CD); circularly polarized luminescence (CPL); g factor; TDDFT (Time-Dependent Density Functional Theory) calculations; ground and excited state; VCD (vibrational circular dichroism); [2; 2; 1] and [2; 2; 2] bicyclic ketones; octant rule
Funding
- Italian Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR) [PRIN 2008LYSEBR]
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UV, circular dichroism (CD), fluorescence and circularly polarized luminescence (CPL) spectra were recorded for a set of four related [2.2.1] bicyclic compounds ((1S,4S)-and (1R,4R)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one, namely (1S)- and (1R)-camphor (1), (1S,4R)-4,7,7-trimethylbicyclo[2.2.1]hept-5-en-2-one, (1S)-dehydro-epicamphor (2), (1S,4S)-1,7,7-trimethylbicyclo[2.2.1]heptane-2,5-dione, (1S)-5-oxocamphor (3), (1S,4R)- and (1R,4S)-1,7,7-trimethylbicyclo[2.2.1]heptane-2,3-dione, (1S)- and (1R)-camphorquinone (4)) and a set of three related [2.2.2] bicyclic compounds (1S,4S)-bicyclo[2.2.2]octan-2,5-dione (saturated diketone (5)), (1R,4R)-bicyclo[2.2.2]oct-7-en-2,5-dione (unsaturated diketone (6)), ((1S,4S)-bicyclo[2.2.2]oct-7-en-5(S)-ol-2-one (which we refer to as unsaturated hydroxy-ketone (7)). For the latter three compounds also mid-IR vibrational circular dichroism (VCD) spectra were recorded and are presented. Time-Dependent Density Functional (TD-DFT) calculations provide a satisfactory interpretation of both absorption and emission chiroptical spectra and permit insight into ground and excited state electronic properties. We discuss the applicability of the octant rule or of other approximated models to rationalize the observed sign of the CPL. Chirality 25:589-599, 2013. (c) 2013 Wiley Periodicals, Inc.
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