Anionic and neutral complexes of ruthenium (II) with nitrogen oxide

Neutral ruthenium complexes of formula (I) or salts of anionic ruthenium complexes of formula (I) with cations Q:

• [RuAaMmPpW]r (I)
• wherein:
• A represents a halogen chosen form the group consisting of Cl− and Br−
• W represents NO+
• M represents SOR1R2
• P represents NR3R4R5, or LRuAaMmW
• a is a whole number between 3 and 4
• m is a whole number between 0 and 2
• p is a whole number between 0 and 1
• r can be 0, −1, −2
• being a+m+n=5
• wherein:
• R1 and R2 are identical or different from each other and represent C1-C6 alkyl, C3-C7 cycloalkyl, phenyl or aryl, or R1 and R2 form a 57 term heterocyclic ring together with the sulphur atom;
• R3, R4 and R5 are identical or different from each other and represent hydrogen, saturated or unsaturated C1-C6 linear or branched alkyl, C3-C7 cycloalkyl, phenyl or aryl, or NR3R4R5 is a saturated or unsaturated 5-7 term nitrogen heterocyclic compound optionally containing at least one additional eteroatom chosen from O, S, N, the latter being optionally substituted with a C1-C4 alkyl, aryl, benzyl residue, said nitrogen heterocyclic compound being optionally benzocondensed and/or substituted with C1-C4 alkyl, C1-C4 alcoxyl, C1-C4 alkylthio, benzyl or aryl;
• L represents a heterocyclic ligand containing at least two nitrogen atoms whose electron pairs are involved in the bond with the two ruthenium atoms present in the complex, with the proviso that when said nitrogen atoms are not contained on the same heterocyclic ring L is B′—X—B″, B′ and B″ being nitrogen heterocyclic compounds and X being chosen from the group consisting of —COO—, —O—, —(CH2)n—, —(CH═CH)n—, -(aryl)n-, -(heterocyclic compound)n-, —CH═CH-Phe-CH═CH—, —(C≡C)n—, with n between 0 and 4.