Research on polymeric organic sensitizers and polymeric inorganic sensitizers for the conversion of norbornadine to quadricyclene and catalysts for the conversion of quadricyclene to norbornadine is described. The interconversion of norbornadine and quadricyclene is studied for its possible use for thermochemical solar energy storage. ...

of thermal rectification date back as early as 1935 when Starr [1] found that copper-cuprous oxide systems

The technique of electron pulse radiolysis has been used to produce aromatic carbonyl triplet states in liquid benzene. Kinetic absorption spectrometry has allowed the determination of the rate constants for quenching of these states by norbornadiene (1), quadricyclene (2), and their ethoxycarbonyl analogues (3 and 4). Analysis of the rate constant data together with quantum ...

A chemically induced nuclear spin polarization study was made to elucidate the structure of the radical cations of norbornadiene (1) and quadricyclene (2) and to ascertain whether they are two discrete species or a single homallylic structure. Photoreaction of chloranil was used. Results indicate that two discrete radical cations are generated by electron transfer from 1 and ...

A detailed study of the thermal and photochemical behavior of Cu(HB(pz)/sub 3/)(CO) in which (HB(pz)/sub 3//sup -/is hydrotris(1-pyrazolyl)borate) in the presence of norbornadiene (NBD) is reported. In solution NBD displaces CO from the coordination sphere of copper to produce a new complex formulated as Cu(HB(pz)/sub 3/)(NBD). This ground-state process is readily discernible by a shift in the ...

Extensive data from quenching kinetics were accumulated on photosolvolysis in t-butyl alcohol for benzyl chloride and a number of meta and para substituted benzyl chlorides. Evidence for the existence of two triplet states, one relatively short lived which gives solvolysis product and a second, relatively long lived which does not give product but instead is energy wasting, was accumulated. The ...

A detailed investigation of the photoassisted valence isomerization of norbornadiene (NBD) to quadricyclene (Q) in the presence of copper(I) salts is reported. In the prototypal cuprous chloride-norbornadiene system, spectral evidence indicates that a 1 : 1 ClCu-NBD ..pi.. complex is present in solution and is, in fact, the photoactive species. Quantum yield data obtained in ...

Insoluble polymer-bound photosensitizers, useful for the conversion of norbornadiene (1) to quadricyclene (2), have been synthesized. An acetophenone analog was produced by Friedel-Crafts acylation of polystyrene resin, while treatment of chloromethylated resin with salicyladehyde and triethylamine produced an analog of benzyloxybenzaldehyde. Reaction of lithio-polystyrene ...

Study of valence isomerization of organic compounds has focused on two mechanisms of photosensitization involving either electron donor-acceptor interaction or energy transfer. The quenching of fluorescent sensitizers by isomerizable substrates results in the formation of excited complexes. These sensitizer-substrate pairs are highly polarized, leading to changes in bond order for the substrates. ...

Formation of a ground-state complex between CuBr(py)(PPh/sub 3/) (py is pyridine) and norbornadiene (NBD) occurs upon mixing the compounds in benzene. Irradiation of the complex with 313-nm light generates the valence isomer quadricyclene (Q) with moderate observed quantum efficiency. This efficiency varies with the nature and concentration of excess ligands present in ...