Compounds of general formula I wherein substituent X can be selected independently from a group comprising BH, CH, BR 1 and CR 1, whereas concurrently at most four X, preferably at most three X, can be CH or CR 1 and whereas at least one group BR 1 or CR 1 is present; R 1 in at least one substituent X is selected from a group comprising A-NHSO 2 NH 2, A-SO 2 NH 2 and A-O-SO 2 NH 2, and R 1 in other substituents X can be selected independently from a group comprising A-NHSO 2 NH 2, A-SO 2 NH 2, A-O-SO 2 NH 2, C 1 -C 8 alkyl, C 2 -C 8 alkenyl, C 6 -C 10 aryl, C 2 -C 8 alkynyl, C 4 -C 10 heteroaryl containing a heteroatom O, S or N, C 1 - C 8 alkoxy, C 1 -C 8 alkylhydroxy, C 1 -C 8 alkylmercapto, OH, NH 2, NH 3 +, C 1 -C 8 alkylammonium, C 1 -C 8 alkylamino, halogen; A is selected from a group comprising a single bond or bivalent linear C 1 -C 10 hydrocarbon chain, wherein at least one carbon atom can optionally be replaced by heteroatoms selected from a group comprising N, S, O, or by C 4 -C 10 heteroarylene, wherein the heteroatom is selected from O, N and S; Y is MR 2, or Y is not present; M is a metal of VIB or VIIIB group of periodical table, preferably Cr, Fe, Ru or Co; R 2 is selected from a group comprising a structure of general formula II wherein X is as defined above whereas concurrently at most three X can be CH or CR 1; R 1 is selected independently from a group comprising A-O-SO 2 NH 2, A-SO 2 NH 2, A-NHSO 2 NH 2, C 1 -C 8 alkyl, C 2 -C 8 alkenyl, C 6 -C 10 aryl, C 2 -C 8 alkynyl, C 4 -C 10 heteroaryl containing O, S or N as heteroatom, C 1 -C 8 alkoxy, C 1 -C 8 alkylhydroxy, C 1 -C 8 alkylmercapto, OH, NH 2, NH 3 +, C 1 -C 8 alkylammonium, C 1 -C 8 alkylamino, halogen, and A is as described above, η 5 -bonded cyclopentadienyl, optionally substituted by 1 to 5 methyls, and η 6 -bonded phenyl ring, optionally bearing from 1 to 6 C 1 -C 6 alkyl groups; Z is H or is not present; whereas from one to three Z are H only when Y is not present; wherein alkyl denotes a linear or branched C 1 - C 8 hydrocarbon moiety not comprising multiple bonds, which can optionally be substituted by one or more substituents selected from a group comprising OH, halogen, NH 2, COOH, CONH 2, CN, NO 2, SH; alkenyl denotes a linear or branched C 2 - C 8 hydrocarbon chain, comprising at least one double bond, which can optionally be substituted by one or more substituents selected from a group comprising OH, halogen, NH 2, COOH, CONH 2, CN, NO 2, SH, SO 3 H; alkynyl denotes a linear or branched C 2 - C 8 hydrocarbon chain, comprising at least one triple bond and optionally also at least one double bond, which can be optionally substituted by one or more substituents selected from a group comprising OH, halogen, NH 2, COOH, CONH 2, CN, NO 2, SH, SO 3 H; aryl denotes a C 6 - C 10 aromatic carbocyclic group, comprising at least one aromatic ring or condensed aromatic rings, which can be optionally substituted by one or more substituents selected from a group comprising OH, halogen, NH 2, COOH, CONH 2, CN, NO 2, SH, SO 3 H; heteroaryl denotes a C 4 - C 10 aromatic carbocyclic group, comprising at least one aromatic ring or condensed aromatic rings, in which at least one carbon atom is replaced by a heteroatom selected from a group comprising N, S, O, which can be optionally substituted by one or more substituents selected from a group comprising OH, halogen, NH 2, COOH, CONH 2, CN, NO 2, SH, SO 3 H; alkoxyl denotes a monovalent group derived from C 1 - C 8 alcohol by the separation of a hydrogen atom from hydroxygroup; alkylamino is a group, created by a substitution of one or two hydrogen atoms of aminogroup by C 1 - C 8 alkyl; alkylmercapto is a monovalent group derived from C 1 - C 8 thiol by the cleavage of a hydrogen atom from SH group; halogen is fluorine, chlorine, bromine or iodine atom; bivalent linear C 1 -C 10 hydrocarbon chain refers to a chain containing single bonds, optionally also double bonds, which binds oneself by terminal carbons; and their pharmaceutically acceptable salts and solvates.