Thermally stable polythiol ligands with pendant solubilizing moieties

A method of replacing a first ligand on a nanostructure with a second ligand comprising admixing a reaction mixture comprising a population of nanostructures having a first ligand non-covalently bound to the nanostructure and a second ligand which is a polythiol ligand, such that the second ligand displaces the first ligand and becomes non-covalently bound to the nanostructure, wherein the polythiol ligand has formula I:

• wherein:
• CM is a central moiety, wherein CM is selected from the group consisting of an alkane, a 1,3,5-triazine, a pentaerythritol, a 1,3,5-triazine-2,4,6-trione, a trimethylolpropane, and a (propane-2,2-diylbis(4,1-phenylene))bis(λ′-oxy);
• X1 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X2 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X3 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X4 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X5 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X6 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• B is —CH2—CH2—C(═O)—O—, —CH2—C(CH3)2—C(═O)—O—, —CH2—CH(CH3)—C(═O)—NH—, —C(═O)—NH—, —CH2—CH2—, or —CH2—CH(OH)—CH2—O—;
• X7 is a bond or C1-12 alkylene;
• X8 is a bond, —O—, —C(═O)—O—, or —C(═O)—N—;
• R1A and R1B independently are H or C1-20 alkyl;
• R2 is C1-20 alkyl or C1-20 alkoxy;
• a is 2 to 10;
• b is 0 to 10;
• c is 2 to 10;
• d is 0 to 10;
• e is 1 to 100;
• and
• f is 0 to 100;
• wherein a+b+c+d has a value within a range of 4 to 40.

A nanostructure film layer comprising:

• (a) a nanostructure;
• (b) polythiol ligands dispersed on the surface of the nanostructure, the polythiol ligands having the formula I:
• wherein:
• CM is a central moiety, wherein CM is selected from the group consisting of an alkane, a 1,3,5-triazine, a pentaerythritol, a 1,3,5-triazine-2,4,6-trione, a trimethylolpropane, and a (propane-2,2-diylbis(4,1-phenylene))bis(λ′-oxy);
• X1 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X2 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X3 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X4 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X5 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• X6 is a bond, —C(═O)—, a C1-10 alkylene, or a C2-10 heteroalkylene;
• B is —CH2—CH2—C(═O)—O—, —CH2—C(CH3)2—C(═O)—O—, —CH2—CH(CH3)—C(═O)—NH—, —C(═O)—NH—, —CH2—CH2—, or —CH2—CH(OH)—CH2—O—;
• X7 is a bond or C1-12 alkylene;
• X8 is a bond, —O—, —C(═O)—O—, or —C(═O)—N—;
• R1A and R1B independently are H or C1-20 alkyl;
• R2 is C1-20 alkyl or C1-20 alkoxy;
• a is 2 to 10;
• b is 0 to 10;
• c is 2 to 10;
• d is 0 to 10;
• e is 1 to 100;
• and
• f is 0 to 100;
• wherein a+b+c+has a value within a range of 4 to 40;
• and
• (c) at least one organic resin.