New [Ru(5,6-dmp/3,4,7,8-tmp)2(diimine)]2+ complexes: Non-covalent DNA and protein binding, anticancer activity and fluorescent probes for nuclear and protein components

► Non-covalent DNA and protein binding Ru(II) complexes are reported. ► [Ru(3,4,7,8-tmp)2(dpq)]2+(4) binds strongly to both DNA and proteins. ► Complex 4 acts as a fluorescent probe for nuclear components and proteins. ► Complex 4 binds efficiently to proteins in the tail of the sperm. ► Complex 4 has the potential to act as a non-hormonal contraceptive.