Patent ID: 7812180

Claim:
A monomer of formula (I): wherein: M is a transition metal, A 1 is a connecting arm ionizable in aqueous solution having a sequence selected from the group consisting of: -A2-X-A3- with: X which represents —NR 1 —, —Y—P(O)(OR 2 )—O- or —N + R 6 R 7 — Y which represents O or NH, A 2 which represents —(CH 2 ) m1 -, —(CH 2 ) m2 —O—[(CH 2 ) 2 O] m3 - (CH 2 ) 2 - or —(CH 2 ) m4 —C(O)—NR 3 —[(CH 2 ) 2 O] m5 —(CH 2 ) 2 —, A 3 which represents —(CH 2 ) n1 -, —[(CH 2 ) 2 O] n2 —(CH 2 ) n3 - or —[(CH 2 ) 2 O] n4 —(CH 2 ) 2 —NR 4 —C(O)—(CH 2 ) n5 -, m1 and n1 which represent, each independently of one another, an integer included within the range extending from 1 to 6; wherein, if X represents —NR 1 — and the groups A 2 and A 3 respectively represent —(CH 2 ) m1 - and —(CH 2 ) n1 , then the sum m1+n1 is included within the range extending from 2 to 6, m2 and n3 which represent, each independently of one another, an integer included within the range extending from 0 to 3, m3, n2, m4, n4, m5 and n5 which represent, each independently of one another, an integer included within the range extending from 0 to 6, R 1 , R 3 and R 4 which represent, each independently of one another, a hydrogen atom or a (C 1 -C 4 )alkyl group, and R 2 which represents a hydrogen atom or a (C 1 -C 4 )alkyl, cyanoethyl or 2-chlorophenyl group, and -A 4 -[NH(CH 2 ) 2 ] n -A 5 - with: A 4 which represents —(CH 2 ) p1 - or —(CH 2 ) p2 —C(O)—, A 5 which represents —(CH 2 ) q1 - or —NR 5 —C(O)—(CH 2 ) q2 -, n which is an integer included within the range extending from 2 to 6, p1, q1, p2 and q2 which represent, each independently of one another, an integer included within the range extending from 1 to 6, R 5 which represents a hydrogen atom or a (C 1 -C 4 )alkyl group, and R 6 , R 7 which represent, each independently of one another, a (C 1 -C 4 )alkyl group, wherein R represents a hydrogen atom or a protective group for the amine functional group.