Triorganotin moiety

The combination of metal cyanide anions with di- and triorganotin moieties gives heterobimetallic coordination polymers of the general formula [(RmSn )j M(CN) 3,] that have been explored very systematically. So far, mainly complexes with square-planar (Ni), tetrahedral (Cu), octahedral (Fe, Co, Ru, Os), " and square antiprismatic (Mo, [M(CN) ] coordination environments have been... 

The SPOR of [ FJfluoroDOPA 20, described in Scheme 13.6, used the same radiochemistry as employed in the corresponding solution-phase radiosynthesis. [ F]FluoroDOPA 20 is synthesized by electrophilic fluorine. The fully protected organometallic precursor is attached to the support via a triorganotin moiety in which one of the methyl substituents is replaced by a propyl linker. The cleavage step occurs upon fluorine incorporation, and subsequent acidic treatment furnishes [ FJfluoroDOPA 20. 

Diphenic acid (H2A) also forms diorganotin(IV) complexes, which are with two monodentate -COO groups. On the other hand, soluble dinuclear triorganotin(IV) complexes (where the organo moieties are Me and Ph) contain symmetrically bound carboxylates, while the less-soluble compound (cHexsSn) has two asymmetrically bonded carboxylates. All have Tbp structures with [RsSnirV)] units remote from each other. °... 

TABLE 45. Selected structural parameters for pentacoordinated triorganotin and organolead complexes with PrN and related moieties... 

TABLE 47. Selected X-ray and NMR data for pentacoordinated triorganotin complexes with the ArN moiety and related compounds... 

In RjSnantibiotic H O, the antibiotic coordinates the triorganotin(IV) moieties through monoanionic bidentate bridging carboxylate groups. 

Some triorganotin carboxylate structures, in particular those containing two RsSn moieties, deserve additional comment because their structures are more varied. For example, rare types of organotin carboxylates include derivatives of carborane-carboxylic acids [ (l,7-C2BioHn-l-COO)Bu2Sn 20]2 (structure of type A) [451]. The bis(triphenyltin) derivative of phenylmaleic acid, 145, contains only four-coordinate tetrahedral tin (Sn O 2.077 and 2.090 A) and is not associated, but in the bis(triphenyltin) citraconate, 146, one tin atom participates in the supramolecular association, 147, and polymer-chain formation and becomes five-coordinate (trigonal pyramidal Sn-O 2.193 A, Sn O 2.397 A) whereas the second remains four-coordinate (Sn-O 2.089 A), as a part of a dangling side chain [441]. 

A peculiar class of supramolecular materials involving Sn- N interactions include triorganotin and related cyanometallates, based upon a linear sequence, 131, of metal centers alternating with cyanide bridges connected through organometallic moieties. 

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