Coordination chemistry sulfur donor

Monomeric sulfur diimides have an extensive coordination chemistry as might be anticipated from the availability of three potential donor sites and two r-bonds. In addition, they are prone to fragmentation to produce thionitroso and, subsequently, sulfido and imido ligands. Under mild conditions with suitable coordinatively unsaturated metal... 

Until now the coordination chemistry of nickel(H) complexes with sulfur donors has been dominated by the dithiocarbamate and phosphorodithioate complexes since they are generally easy to prepare, and a wide range of substituents can be introduced in these ligands. Recently, complexes with simple ligands such as S2-, S ", HS and RS- have also been characterized and investigated. 

Mercury(II) coordination compounds containing Se or Te donor atoms constitute a rather neglected area of coordination chemistry. Often the species show similarities to the corresponding sulfur compounds (see Table 17). Mercury(II) selenide, HgSe, and mercury(II) telluride, HgTe, are simply formed by direct combination of the elements.4 Single crystals are available by chemical transport methods using a pure H2 or Ar stream.402 X-Ray diffraction... 

This section of the coverage of palladium(II) coordination chemistry will concentrate on complexes of the more common, usually unidentate ligands containing sulfur, selenium or tellurium donor atoms coverage of the vast number of chelate complexes of bi- or multi-dentate ligands will be limited but the reader will find references to most classes of palladium(II) chelate complexes and these will provide an entry into the literature. 

The substitution chemistry of the Ru(II) and Os(II) porphyrins is synopti-cally presented in Scheme 1 and Table 4. The lability of the trans-U in MCO(P)L may be used to prepare a large variety of complexes MCO(P) L with other ligands L where the donor atom may be any oxygen-, nitrogen-, or sulfur donor (reaction path a of Scheme 1 and Table 4), cyanide (paths a, b) or carbon monoxide (c) [190]. Coordinated cyanide in [OsCO(OEP)CN]- can be transformed into isonitrile with methyifluorosulfonate [191]. 

Many of the general characteristics of dithiolene ligands and their metal complexes described in other chapters of this volume are also useful to Nature. A recurring theme of dithiolene coordination chemistry is their ability to stabilize multiple redox states for a wide variety of metals. The access to multiple redox states combined with a propensity for substantial electronic delocalization likely influenced Nature s choice of dithiolene as a chelating ligand over other potential bidentate sulfur donors. 

N Si coordination (76, 7776 78a77 ) and most recently also with oxygen (78b,78 7 979), sulfur (78c),78 and phosphorus (78d)78 donor-ligands. The present section describes the chemistry of donor-stabilized silyl cations with hydrazido chelates. 

---