| http://www.w3.org/ns/prov#value | - In even more preferred embodiments, R1, R2, R3, R4, R5, and R6 are the same and are a hydrolyzable group selected from the group consisting of C1-C5 alkoxy, aryloxy, and halide; and X is selected from a group consisting of C1-C10 alkyl, C2-C10 alkenyl, C1-C10 alkylbenezene, and C1-C10 dialkylether, each optionally functionalized with one or more functional groups selected from the group consisting
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