Iodine complex and preparation method therefor and use thereof

An iodine complex obtained by complexing with iodine a polymer containing a structural unit represented by Formula (I) and optionally at least one of structural units represented by Formula (II), Formula (III) and Formula (IV):

• in Formula (I), R1, R2, R3, R4, R5 and R6 are the same or different, independently selected from H, C1-8 alkyl, and C6-20 aryl that is unsubstituted or substituted by one, two or more Ra;
• each Ra is the same or different, independently selected from C1-12 alkyl;
• a is an integer greater than or equal to 50, e is an integer greater than or equal to 1, b, c, d, and f are independently integers greater than or equal to 0;
• in Formula (II), R19 is selected from H, cyano, C1-8 alkyl, substituted and unsubstituted C3-10 cycloalkyl, and substituted and unsubstituted C6-20 aryl, wherein the substituents are one, two or more Ra, each Ra being the same or different, independently selected from C1-12 alkyl;
• and g is an integer greater than or equal to 1;
• in Formula (III), R13, R16, R17 and R18 are the same or different, independently selected from H, C1-8 alkyl, and C6-20 aryl that is unsubstituted or substituted by one, two or more Ra, each Ra being the same or different, independently selected from C1-12 alkyl;
• and h, I, j, k and n′ are independently integers greater than or equal to 1;
• and
• in Formula (IV), R7, R8, R9, R10, R11 and R12 are the same or different, independently selected from H, C1-8 alkyl, and C6-20 aryl that is unsubstituted or substituted by one, two or more Ra, each Ra being the same or different, independently selected from C1-12 alkyl;
• and a′, b′, c′, d′, e′ and f′ are independently integers greater than or equal to 0, and are not 0 at the same time.