Mercury complexes transition metal ligands

Aminoboranes have been used as ligands in complexes with transition metals (66) in one instance giving a rare example of two-coordinate, non-/0 transition-metal complexes. The molecular structure of the iron complex Fe[N(Mes)B(Mes)2]2 where Mes = 2,4,6-(CH3)3C5H2 is shown in Figure 1. The less sterically demanding lithium borylamide, LiN(CH3)B(CH3)2, used to prepare mercury and tin complexes, has also been prepared (67). 

Polyaza-, polythia-ligands. Recognition of transition metal ions. Replacing the oxygen sites with nitrogen or sulphur yields macrocycles and cryptands that show marked preference for transition metal ions and may also allow highly selective complexation of toxic heavy metals such as cadmium, lead and mercury [2.41-2.44, A.14]. 

Phosphorus magnetic shielding tensors, general phosphido ligands in transition metal complexes, 1, 472 Phosphorus(III) mercury compounds, preparation, 2, 425-426 Phosphorus—metal complexes, characteristics, 2, 34 Phosphorus—nitrogen-containing rings, chromium carbonyl link, 5, 225... 

Other metals for which complexes of ligand 79 have been isolated are iron(II)48, 5s, 56,58,59) ir0n(III) 47,52, s4, s6> 59), zinc(II) 57 59), cadmium(II) 59,60,78), mercury(II) 58,78), magnesium(II) S9 60), manganese(II)58>, nickel(II)79), and lead(II)80). The reduction of bis-amws 79 has been reported to afford ligand 81. In addition, the transition metal complexes of iron(III), cobalt(III), nickel(II), and copper(II) with ligand 81 have been prepared and characterized 53). 

The coordination of catenated nitrogen ligands to transition metals also dates back to the early work of Griess 89, 90), which included references to copper and silver derivatives of 1,3-diphenyltriazene. Around the turn of the century Meldola and Streatfeild 146-148), Meunier 150-152), Niemen-towski and Roszkowski 159), Cuisa and Pestalozza 55,56), and others reported extensively on triazene complexes of copper, silver, and mercury, and in the late 1930s and early 1940s Dwyer and colleagues 69-74) extended this work to include derivatives of nickel and palladium. However, most work on the coordination chemistry of triazenes and other catenated... 

Transition metal carbodiimides, such as MnNCN and CuNCN, and carbodiimides derived from zinc, mercury,silver and thallium are also known. A preceramic polymeric titanium carbodiimide is obtained in the reaction of TiCU with bis(trimethyl-silyl)carbodiimide. Liganded carbodiimidotitanium complexes are obtained in the reaction of CpaTiCla with Me3SnN=C=NSi(i-Pr)3. ° Also, dicyclopentadienyl titanium (IV) diisocyanates are converted into carbodiimides with LiN(SrMe3)2. ... 

The term 7r,7r-transfer has been proposed for 7r-allyl ligand transfer from one transition metal to another. Such processes differ from those giving a-allyl derivatives 160), which are termed Tr.a-transfer processes. The latter have been studied in detail 161) for 7r-allylnickel, -palladium, and -platinum complexes interacting with metallic mercury. It has been shown that binuclear 7r-allylpalladium complexes rapidly react with mercury in... 

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