1. J. Organometal. Chem., 1975: Title: SYNTHESIS OF A TRANSITION METAL-DITHIONITE COMPLEX [pretty sketchy work but the first report] LINK2. J. Organometal. Chem., 1980: Title: SYNTHESIS, CHARACTERIZATION AND SOME REACTIONS OFORGANOMETALLIC COMPLEXES CONTAINING BRIDGNG DITHIONITE LIGAND [An extension of the previous publication to other metal systems] LINK 3. Organometallics, 1985: Title: Reduction of SO2 by (C5R5)M(C0)3H (M = Mo, W; R = H, Me).Chemistry and Structures of (C5H5)Nlo(CO),(SO,H),the FirstExample of Insertion of SO2 into a M-H Bond, and[ (C5M5,)Mo(CO)3],(S2O4),S-Bonded Dithionite Complex [Complex is described by authors as "unexpected" but still recovered in 31% yield, note the complex is to the C2h dithionite structure and the S-S distance is 3.692 A] LINK4. J. Amer. Chem. Soc., 1999: Title: Oxidation of the Sulfide Ligands to SO42- in the Dinuclear Complex{RuCl[P(OMe)3]2}2(µ-S2)(µ-Cl)(µ-N2H4): Synthesis andCharacterization of {RuCl[P(OMe)3]2}2(µ-S2)(µ-Cl)(µ-N2H4)+HSO4-,{RuCl2[P(OMe)3]2}2(µ-S)(µ-N2H4), and{RuCl[P(OMe)3]2}2(µ-S2O5)(µ-N2H4) [The dithionite complex is more of an intermediate than an isolated product but the mechanism is amusing] LINK
5. Angew. Chemie, 2006: Title: Direct Observation of Photochromic Dynamics in the Crystalline State of an Organorhodium Dithionite Complex [Nice work but a classic case of duplicate publication, the S-S distance is 2.330 A and note the energetic similarity of the S-S and S-O bonded dithionites] LINK and LINK
6. J. Organometal. Chem., 2007: Title: Synthesis and structural characterization of a photoresponsive organodirhodium complex with active S–S bonds:[(CpPhRh)2(l-CH2)2(l-O2SSO2)] (CpPh = g5-C5Me4Ph) [it may seem like a simple extension but these complexes are pretty remarkable, S-S in cis is 2.295 A and S-S in trans is 2.299 A, how is that possible?] LINK