Bis-n-arene Complexes

Table 18 Some bis-n-arene complexes and arene metal carbonyl complexes ( K ... 

Table 20 Me netic properties of some bis-n-arene complexes...

The bifunctional amine-tethered ruthenium(II) arene complexes [Ru(r6 ti1-C6H5CH2(CH2)i1NH2)C12] (n = 1,2) (13a,b) show two consecutive hydrolysis steps to yield the mono- and bis-aqua complexes (64). At extracellular chloride concentrations, the majority of the complexes could be expected to be present as the mono-aqua adduct. Equilibrium constants were determined for both steps (for 13b, Ki = 145 mM K2 = 5.4 mM) and found to be considerably higher than those of cisplatin, which also has two reactive sites available. 

Synthesis and X-ray crystal structures of the first antimony and bismuth calixarene complexes have been described. The reaction of the monosodium salt of />-/f /-butylcalix[4]arene (BucC4) with 2equiv of SbC provided Bu OKSbCl. Bismuth calixarene complex was prepared by treatment of/>- r -butylcalix[8]arene with Bi[N(SiMe3>2]3 <2004CC1472>. 

Equation (4)).121 This molecule has also been prepared in solution by reaction of the phosphaalkyne with the bis(arene) complex, (r/ -(, I IsMc)2Ti, or by salt metathesis of TiCl with (KP3C2tBu2) (n = 2, 3) in refluxing toluene. The sandwich complex undergoes a [2 + 2]-cycloaddition with Bu C=P to yield [Ti(r/i-P3C2tBu2)(r/,r/2 P403 Bu3) 202, which has also been characterized by X-ray diffraction. 

Bis ( 7 -arene) metal complexes have been made for many transition metals by the AI/AICI3 reduction method and cationic species [M( j -Ar)2] are also well established for n —, 2, and 3. Numerous arenes besides benzene have been used, the next most common being l,3,5-Me3C6H3 (mesitylene) and CeMee-Reaction of arenes with metal carbonyls in high-boiling solvents or under the influence of ultraviolet light results in the displacement of 3CO and the formation of arene-metal carbonyls ... 

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