Catalysts based on amino-sulfide ligands for hydrogenation and dehydrogenation processes

A metal complex of Formula II and III

• M(SN)pZa II
• M(SNS)Za III
• wherein:
• each Z is simultaneously or independently a hydrogen or halogen atom, a C1-C6 alkyl, a carbene group, a hydroxyl group, or a C1-C7 alkoxy radical, a nitrosyl (NO) group, CO, CNR (R=Alkyl, Aryl), nitrile, phosphite, phosphinite, or phosphine;
• M is a group 7, group 8, or group 9 transition metal;
• p is equal to 1 or 2, whereas a is equal to 1, 2, or 3;
• SN is a bidentate coordinated ligand of Formula IA, wherein the coordinating groups of the SN ligand consist of one thio group and one nitrogen group;
• SNS is a tridentate coordinated ligand of Formula IB, wherein the coordinating groups of the SNS ligand consist of two thio groups and one nitrogen group:
• where
• the dotted lines simultaneously or independently indicate single or double bonds;
• R1, R2, R5, and R6 are each independently H, a substituted or unsubstituted linear or branched C1-C20 alkyl, a substituted or unsubstituted cyclic C3-C8 alkyl, or a substituted or unsubstituted C2-C20 alkenyl, a substituted or unsubstituted C5-C20 aryl, OR or NR2;
• or when taken together, R1 and R2 groups or R5 and R6 groups can form a saturated or partially saturated C5-C20 cycle;
• R3 and R4 are each independently H, a substituted or unsubstituted linear, branched or cyclic C1-C8 alkyl or alkenyl, a substituted or unsubstituted C5-C8 aromatic group, ester group;
• or, when taken together, R3 and R4 can form an optionally substituted saturated or partially saturated C5-C20 hetero-aromatic ring;
• R5 when taken together with R4 can form an optionally substituted saturated or partially saturated C5-C20 aromatic ring;
• R7 is H, a substituted or unsubstituted linear or branched C1-C8 alkyl, a substituted or unsubstituted cyclic C3-C8 alkyl, a substituted or unsubstituted C2-C20 alkenyl, or a substituted or unsubstituted C5-C20 aryl;
• and
• n, m, and q are simultaneously or independently 0, 1, or 2.