Triplet energies, table

The spectroscopic catalog of polyene T, triplet energies (Table 2) has expanded very little since the... 

Table 2. Singlet-triplet energy separations (AEsx) in M-H monomers, M—M bond dissociation energies (BDEs), SCF calculated bond lengths for the hypothetical, linear dimers HMMH (M = B, Al, Ga, In, or Tl) ...

Table 1 Spin preference of ground state and the calculated singlet-triplet energy separation of some selected Jt-conjugated diradicals...

Table 1. Bond lengths (A) and singlet-triplet energy differences (in kcal/mol) for triplet phosphinidenes ...

Table 2. Singlet-triplet energy differences (A sx) and singlet (BDEj), triplet (BDEx), and composite (BDEsx/xs) bond dissociation energies for phosphinidenes and their W(CO)5 complexes, calculated with BP/TZP...

A list of singlet-triplet energy splittings measured using photoelectron spectroscopy is give in Table 5.4. 

Table 5.3. Lowest Triplet Energies of Some Carbonyl Compounds(30, Sa-b-sl)...

Table 5.4. Lowest Triplet Energies of Various Hydrocarbons...

Porter and Wilkinson(56) measured the rates of quenching for a variety of triplet donors with triplet acceptors at room temperature in fluid solution by flash photolysis. The appearance of the triplet-triplet absorption spectrum of the acceptor and the simultaneous disappearance of the donor triplet-triplet absorption spectrum provided unequivocal evidence for the triplet-triplet energy transfer process. Table 6.5 provides some of the quenching rate constants reported in this classic paper. 

Attempts to sensitize the rearrangement with benzophenone, propiophenone, and chlorobenzene failed, as indicated in Table 8.1. Although the reaction could not be sensitized, triplet energy transfer was taking place inasmuch as compound (1) quenched the photoreduction of benzophenone without the formation of any new products (Table 8.2). 

Triplet state (cont d) intersystem crossing quantum yields, table of, 239-240 lifetime, 12 lowest triplet energies of carbonyls, table of, 224-225 of hydrocarbons, table of, 226 of various organic molecules, table of, 227... 

The lowest triplet energies of a number of organic molecules, determined by the various techniques described in this section, are presented in Tables 5.3-5.5. 

Table 5.5. Lowest Triplet Energies of Other Organic Molecules...

Table 6.5. Rate Constants for Triplet-Triplet Energy Transfer<58>...

Table 6.7. Rates and Rate Ratios for Intramolecular Triplet Energy Transfer in Compounds (7), n = 2,3,4...

Phosphorescence spectra of DTT and DTP were measured in MeOH/EtOH glass at 77 K. DTT and DTP exhibited phosphorescence with clear vibrational structure. This finding is attributed to the rigid structure caused by the bridging group at the 3,3 positions of 2,2-bisthiophene 84. The triplet energy of DTT and DTP estimated from the 0-0 bands of the phosphorescence spectra are given in Table 9. 

Table 1. Calculated Singlet-Triplet Energy Gap (A St> kcal/mol) in Phenylcarbene (la)0...

In the sensitized generation of ethoxy-carbonyl-carbene the fight capture by the diazocompound is only 25% A number of photosensitized reactions of triplet carbenes with cis- and trans-olefins are fisted in Table 10. The sensitizers used, as well as their various triplet energies Et, are also given in the table. 

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