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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

ABSTRACT

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. © 2013 Wiley Periodicals, Inc.

Featured Compounds

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  1. 1 - 7
Compound 1
Molecular Weight:152.2334
Molecular Formula:C10H16O
InChIKey:DSSYKIVIOFKYAU-XCBNKYQSSA-N
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Compound 2
Molecular Weight:150.2176
Molecular Formula:C10H14O
InChIKey:KTNFBBWUUDKXOF-XCBNKYQSSA-N
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Compound 3
Molecular Weight:166.217
Molecular Formula:C10H14O2
InChIKey:UDIUFGIXIGLRSM-LHLIQPBNSA-N
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Compound 4
Molecular Weight:166.217
Molecular Formula:C10H14O2
InChIKey:VNQXSTWCDUXYEZ-LDWIPMOCSA-N
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Compound 5
Molecular Weight:138.1638
Molecular Formula:C8H10O2
InChIKey:WMJKUNDVKHUCMV-WDSKDSINSA-N
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Compound 6
Molecular Weight:136.1479
Molecular Formula:C8H8O2
InChIKey:RLWFLNMCQMZCJQ-WDSKDSINSA-N
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Compound 7
Molecular Weight:138.1638
Molecular Formula:C8H10O2
InChIKey:XAJIACLENLVBRZ-QYNIQEEDSA-N
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