A polymer and a method of forming a polymer are provided. The polymer has the general structure (I): wherein M is an organic moiety; X is a main group element selected from S, P, As, Se, Te, and Sb; R1 is a direct bond between M and the ethylene group depicted between M and X or a hydrocarbyl linking moiety having between 1 and about 9 carbon atoms; R2 is a hydrocarbyl moiety; R3 is an organic linking group; Y has a value of 0, 1, 2, 3, or 4; Z has a value of 0, 1, 2, 3, or 4; YY has a value of 0, 1 or 2; and Y, YY, and Z are such that the total number of moieties bonded to M is 3, 4, 5, or 6.