n)b, O, S, Se, or Te; Q is the same or different at each occurrence and is (ZR"n)b; a is an integer from 0 to 5; b is an integer from 0 to 20; c is an integer from 0 to 4; q is an integer from 0 to 7; and n is an integer from 1 to 2; with the proviso that at least one of the monomers contains a crosslinkable group.">
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