Sulfur dioxide complexes

Ryan RR, Kubas GJ, Moody DC, Eller PG (1981) Structure and Bonding of Transition Metal-Sulfur Dioxide Complexes. 46 47-100... 

Kovalevsky AY, Bagley KA, Cole JM, Coppens P (2002) The first photocrystallographic evidence for light-induced metastable linkage isomers of ruthenium sulfur dioxide complexes. J Am Chem Soc 124 9241-9248... 

The sulfur dioxide complex (2) has been shown to contain an S-bound sulfur dioxide ligand.51... 

By a similar reaction to that shown in equation (50), the unusual complex [RhC PPr f/ -MeC6H4NSO)] can be prepared. In the solid state the ligand is S-bound but isomerization to a /t-bonded species occurs in solution. The latter compound is hydrolyzed by water to a sulfur dioxide complex (equation 55).190... 

X-ray crystallography has shown that the S02 ligand binds through both sulfur and oxygen.1310,1316 The sulfur dioxide complex (132) is easily oxidized by dioxygen in benzene solution to form the sulfato complex [Rh(N0)(S04)(PPh3)2].1310,1316 The product distribution when 1802 is the reactant implies that an intermediate sulfur bound sulfato complex is formed.1316... 

Structure and Bonding of Transition Metal-Sulfur Dioxide Complexes ... 

An excellent review entitled Sulfur Dioxide Complexes of the Platinum Metals has recently appeared which, in addition to the subject impUed by the title, addresses the electronic structure of SO2 and its bonding to metal complexes. The present work attempts a more comprehensive review of the structure and bonding of transition metal-SO2 complexes, with particular emphasis on results which have appeared since the previous review. 

The amphoteric nature of the nitrosyl ligand has been extensively discussed by several authors in terms of molecular orbital models and in particular the utility of the extended Hiickel approach for understanding the bonding has been demonstrated by Hoffmann, et al. This latter work has been extended to sulfur dioxide complexes by Ryan and Eller The interested reader is referred to the recent review by Mingos for a summary Although detailed molecular orbital treatment will no doubt be necessary for a complete understanding of SO2 bonding, we find that the simple acid/base concept serves to correlate the presently known structural information. This point of view will be emphasized in the present article and extended to include >7 -802 as a r acid 1... 

Fig. 25. Ni(np3)(S02). (Reprinted, with permission, from Synthesis and Structural Characterization of a Sulfur Dioxide Complex of Nickel with Tris-(2-(d henylphosphino)ethyl)amine, Mealli, C. et al. Inorg. Chem. 17, 3021, Fig. 1, copyright, 1978, by the American Chemicd Society)...

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