Multi-armed chromophores with very large two-photon absorption cross-sections

摘要

Provided are chromophores with very large two-photon absorption cross-sections. One group of these chromophores has the formula:; $PTEXTPDAT(T\—Q)/PDATHILSBPDATn/PDAT/SB/HILPDAT\—N\—Ph/PDATHILSBPDATm/PDAT/SB/HIL/PTEXT$ ;wherein Q is a single bond or 1,4-phenylene, Ph is a phenyl group, n has a value of 1-3 and m has a value of 3−n, and wherein T is ;wherein R₁ and R₂ are alkyl groups having 1 to 20 carbon atoms, provided that when Q is a single bond, the value of n is 2 or 3.;Another group of these chromophores has the formula:; $PTEXTPDAT(T\—Q)/PDATHILSBPDATn\—G\—Ph/PDAT/SB/HILHILSBPDATm/PDAT/SB/HIL/PTEXT$ ;wherein T is as defined above, Q is a single bond or 1,4-phenylene, Ph is a phenyl group, n has a value of 1-4 and m has a value of 4−n, and wherein G is a 4-arm core unit.;Yet another group of these chromophores has the formula:; $PTEXTPDAT(T\—Q)n\—G\—Ph/PDATHILSBPDATm/PDAT/SB/HIL/PTEXT$ ;wherein T is as described previously, Q is a single bond or 1,4-phenylene, Ph is a phenyl group, n has a value of 1-6 and m has a value of 6−n, and wherein G is a 6-arm core unit.