Abstract: Substituted 4-oxo-4H-benz-[d,e]anthracenes are fluorescent dyes which are useful in biomedical studies and analytical determinations. They are particularly useful in assays for living organisms, e.g. microorganisms, carried out at a pH of 9 or less. For these determinations, the fluorescent dyes can be attached to reducible compounds which will release the dye upon reduction. Alternatively, these dyes can be used in assays for hydrolytic enzymes or biological cells containing these enzymes. For these determinations, the dyes are attached to blocking groups.

Abstract: A 6-tertiary amino-2-(Z.dbd.CH--)benzofuran dye is disclosed, where Z represents the atoms providing an electron withdrawing group and a conjugated methine linkage completing a resonant dye chromophore including the 6-tertiary amino group as an electron donor and the electron withdrawing group as an electron acceptor. The dyes are formed by condensing a 6-tertiary amino-2-formylbenzofuran with an electron withdrawing dye nucleus precursor containing an active methyl or methylene site. The dyes exhibit bathochromically shifted absorption peaks.

Abstract: A photographic imaging system is disclosed comprised of a hardenable organic component containing ethylenic unsaturation sites and coinitiators for ethylenic addition. The coinitiators include an activator and a photosensitizer. The photosensitizer is a 6-tertiary amino-2-(Z--CH.dbd.)benzofuran dye, where Z represents the atoms providing an electron withdrawing carbonyl or sulfonyl group and completing a conjugated methine linkage extending from the electron withdrawing carbonyl group through the benzofuran to the electron donating 6-tertiary amino substituent to form a resonant dye chromophore. The photosensitizers bathochromically extend exposure response of the imaging system.

Abstract: Substituted 4-oxo-4H-benz-[d,e] anthracenes are fluorescent dyes which are useful in biomedical studies and analytical determinations. They are particularly useful in assays for living organisms, e.g. microorganisms, carried out at a pH of 9 or less. For these determinations, the fluorescent dyes can be attached to reducible compounds which will release the dye upon reduction. Alternatively, these dyes can be used in assays for hydrolytic enzymes or biological cells containing these enzymes. For these determinations, the dyes are attached to blocking groups.

Abstract: Novel benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes and intermediates for their preparation are disclosed.

Abstract: An electroluminescent device is disclosed having a luminescent zone of less than one .mu.m in thickness comprised of an organic host material capable of sustaining hole-electron recombination and a fluorescent material capable of emitting light in response to energy released by hole-electron recombination.

Abstract: Novel benzopyrano[6,7,8-i,j]quinolizine-11-one lasing dyes and intermediates for their preparation are disclosed.

Abstract: Phosphonocoumarins and phosphacoumarin lasing dyes are disclosed.

Abstract: Phosphorous diketonate electron accepting compounds are disclosed for use as sensitizers in electron donating photoconductive compositions. Methine dyes having a phosphorous diketonate component and a method of making same are also disclosed.

Abstract: Novel 4H-thiopyran-1,1-dioxides are disclosed. They are useful as electron transporters in electrophotographic layers and elements.

Abstract: Phosphorous diketonate electron accepting compounds are disclosed for use as sensitizers in electron donating photoconductive compositions. Methine dyes having a phosphorous diketonate component and a method of making same are also disclosed.

Abstract: Photoconductive compositions comprising photoconductors and 1,4,5,8-naphthalene bis-dicarboximide sensitizing compounds are disclosed. Compositions and elements containing such compounds are sensitized to radiation below 400 nm. Embodiments are disclosed in which the photoconductor is an arylalkane leuco base. Such embodiments are advantageously nonsensitive to radiation above 400 nm and are also nonpersistent.

Abstract: .alpha.-Ketoimidomethyl blocked photographic reagents are useful in photographic elements, film units and processes. The blocked photographic reagents have the structure: ##STR1## wherein J represents ##STR2## X represents the atoms to complete a 5- or 6-membered ring or ring system; R represents alkyl of 1 to 30 carbon atoms or aryl of 6 to 30 carbon atoms; andPR represents the residue of an organic photographic reagent containing a heteroatom through which it is joined to the blocking group.

Abstract: Novel electron donor precursors have the structure: ##STR1## wherein: Z represents the atoms to complete a mono-, bi- or tricyclic ring system, each ring of which contains 5 to 6 nuclear atoms;n is 1 or 2;R.sup.1 is a monovalent aromatic group when n is 1 and a bivalent aromatic group when n is 2; andR.sup.2 represents hydrogen, an alkyl group, an aryl group, an acyl group, an ester group or an amido group.The compounds are useful in photographic elements, film units and processes to provide electrons to immobile compounds which must accept at least one electron before releasing a diffusible dye or photographic reagent.