Triatomic Ligands

Among the triatomic ligands (incl. neutral molecules such as HjO, SO2, and CO2) the anions N02, N3 , NCO , NCS, NCSe , and NCTe are well-known as ambidentate ligands. These anions have two or three donor atoms and can coordinate with a metal atom at one or the other position. Furthermore, they can serve not only as unidentate ligands but also as bridging ligands, connecting two or more metal atoms in various ways. This chapter focusses on the thiocyanate anion the various coordination modes will be shown. 

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In contrast to these extensive studies of complexes of the triatomic ligands NOJ and NCS-, little substantial information exists concerning linkage isomers of closely related ligands such as... 

The most widely known and abundant heteroelement triatomic ligands are those of carbon dioxide (C02) [11,13,104-109], carbonyl sulfide (COS) [105], carbon disulfide (CS2) [11,13,105,110,111], and sulfur dioxide (S02) [11,13,112],... 

Sulfurdiimine, Triazenido, Azabutadiene and Triatomic Hetero Anion Ligands... 

Reaction of V-methylhydroxylamine and various unsaturated triatomic reactants yield chelating ligands that form yellow M0O2L2 complexes.212 Mo02(MeHNO)2 reacts with the appropriate unsaturated molecule to yield complexes with five-membered chelate rings. For example, in equation (29) the resulting complex has the cis dioxo distorted octahedral structure. 

Hydrated nickel(II) salts in the presence of the ligand p3 react with both white phosphorus and yellow arsenic, breaking up the structure of the tetraatomic P4 and As4 molecules to form triatomic cyclo-triphosphorus and cyc/o-triarsenic species. These fragments act as trihapto ligands yielding double sandwich complexes (equation 99).292 The compounds are air-stable both in the solid state and in solution. Upon reduction with NaBH the complexes of equation... 

Sulfurdiimine, Azabutadiene and Triatomic Hetero Anion Ligands (vi) Metals in Group VIII Ni, Pd, Pt... 

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