Alkyl-acid ligands for nanocrystals
View Patent ↗Quantum-dot binding ligands with easy to synthesize alkyl-acids are provided. The quantum-dot binding ligands include a multiplicity of carboxy binding ligands in combination with an alkyl backbone, and optionally a solubilizing group. The ligands and coated nanostructures of the present invention are useful for close packed nanostructure compositions, which can have improved quantum confinement and/or reduced cross-talk between nanostructures.
1. A composition comprising:
(a) a quantum dot binding-ligand having the formula:
wherein
each R 1a , R 1b , R 2 and R 4 is independently selected from the group consisting of H,
C 1-20 alkyl, C 1-20 heteroalkyl, C 2-20 alkenyl, C 2-20 alkynyl, and cycloalkyl; each R 3a and R 3b is independently selected from the group consisting of H and C 1-6 alkyl; subscripts m and n are each independently 0 or 1, such that m+n is 1; and subscript p is an integer of from 5 to 500; wherein
when subscript m is 0, then one of R 1a and R 1b is H, and R 2 and the other of R 1a and R 1b are selected from the group consisting of C 8-20 alkyl, C 8-20 heteroalkyl, C 8-20 alkenyl, C 8-20 alkynyl, and cycloalkyl;
when subscript m is 1, then R 1a and R 2 are both H and R 1b is selected from the group consisting of C 8-20 alkyl, C 8-20 heteroalkyl, C 8-20 alkenyl, C 8-20 alkynyl, cycloalkyl and aryl; and
(b) a population of InP light emitting quantum dots (QDs).
2. The composition of claim 1 , wherein subscript p is from 70 to 80.
3. The composition of claim 1 , wherein
(a) R 2 is C 8-20 alkyl, and
(b) subscript p is from 70 to 80.
4. The composition of claim 1 , wherein R 2 is C 18 alkyl.
5. The composition of claim 1 , having the structure:
6. The composition of claim 1 , wherein
(a) at least one of R 1a , R 1b and R 2 is H; and
(b) at least one of R 1a , R 1b and R 2 is independently selected from the group consisting of C 8-20 alkyl, C 8-20 heteroalkyl, C 8-20 alkenyl, C 8-20 alkynyl, cycloalkyl and aryl.
7. The composition of claim 1 , wherein at least one of R 1a , R 1b and R 2 is C 8-20 alkyl.
8. The composition of claim 1 , wherein at least one of R 1a , R 1b and R 2 is independently selected from the group consisting of octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, nonadecane, and icosane.
9. The composition of claim 1 , wherein at least one of R 1a , R 1b and R 2 is independently selected from the group consisting of tetradecane, hexadecane, octadecane, and icosane.
10. The composition of claim 1 , wherein subscript p is from 10 to 100.
11. The composition of claim 1 , wherein subscript m is 0 and subscript n is 1.
12. The composition of claim 11 , having the structure:
13. The composition of claim 11 , wherein R 2 is selected from the group consisting of C 8-20 alkyl, C 8-20 heteroalkyl, C 8-20 alkenyl, C 8-20 alkynyl, and cycloalkyl.
14. The composition of claim 11 , wherein R 2 is C 8-20 alkyl.
15. The composition of claim 11 , wherein subscript p is from 25 to 100.
16. The composition of claim 1 , wherein subscript m is 1 and subscript n is 0.
17. The composition of claim 16 , having the structure:
18. The composition of claim 16 , having the structure:
19. The composition of claim 16 , wherein R 1b is selected from the group consisting of C 8-20 alkyl, C 8-20 heteroalkyl, C 8-20 alkenyl, C 8-20 alkynyl, cycloalkyl and aryl.
20. The composition of claim 16 , wherein R 1b is C 8-20 alkyl.
21. The composition of claim 16 , wherein subscript p is from 10 to 50.
22. The composition of claim 1 , wherein said InP quantum dot is a core-shell quantum dot.
23. The composition of claim 22 , wherein said core-shell quantum dot is InP/ZnS.
24. The composition of claim 1 , wherein the quantum dot binding-ligand is bound to the InP quantum dot.