Patent ID: 8558019

Claim:
A compound of formula 1 wherein R 1 is phenyl, tert-butoxy, or C 1-6 alkyloxy; R 2 is phenyl, 4-fluorophenyl, 4-methylphenyl, 2-furanyl, 2-thienyl, isopropyl, isobutenyl, cyclopropyl, 3-furanyl, 3-thienyl, or 2-propenyl; R 3 is benzoyl, m-methoxybenzoyl, m -azidobenzoyl, or m -chlorobenzoyl; R 4 is C(O)R x where R x is: H; C 1-6 alkyl, optionally substituted with one to six halogen atoms, which may be the same or different; C 3-6 cycloalkyl; or C 2-6 alkenyl or hydroxyl; R 5 is H; or methyl; or C(O)R x , where R x is: H, C 1-6 alkyl, optionally substituted with one to six halogen atoms, which may be the same or different; C 3-6 cycloalkyl; C 2-6 alkenyl or hydroxyl; and M1 is sulfur bearing substituent linked to a colloidal metal particle, wherein the compound has a structure selected from the group consisting of structures 2-4, 6-11, 16-18, 27 and 33 where n is an integer between 0 and 100, and X is said colloidal metal nanoparticle.