Iridium crystal structure

The crystal structure of chloro-pentamethylcyclopentadienyl-S-leucyl-S-leucyl methyl ester-iridium(III), (86), indicates that the Ir—N(NH2-linkage) is longer (2.129 A) than that to the deprotonated peptide N atom (2.090 A).131... 

The resolution of the PDB 1X8W crystal structure does not allow identification of magnesium ions. However, heavy atom [europium (Eu) and iridium. 

The relationship between selectivity vs. ligand topography was determined for some ligands based on the x-ray crystal structure of the corresponding iridium complexes." " " The stmctures of the respective oxazoline-carbene ligands 599a-d are shown in Figure 8.24." ... 

An X-ray crystal structure of 55, redrawn as Fig. 10, supported the formulation of the complex as that of a peroxo system. Further, the structure demonstrated that no interactions between the [Of-] ligand and the borate moiety were possible because of the relative arrangement of the [Of-] and borate ligands about the iridium center. Such interactions were implicated in the oxygen-initiated decomposition of the iridium complex of 52, while the lack of reactivity of the iridium complexes of 53 and 54 was attributed to steric factors arising from the alkyl chains connecting the sulfur atoms. 

Fig. 1. The di-, tri-, and tetranuclear structures observed in X-ray crystal structures of hydroxo-bridged oligomers of cobalt(III), rhodium(III), iridium(III), or chromium(III) structures 4b, 7b, and 7c have never been observed, but the last two have been mentioned as possible structures for two of the known isomers of Cj4(OH)66+...

The X-ray crystal structure of 62 presents a square pyramidal coordination geometry, with a planar C5-chain and the iridium atom slightly displaced (by 24 pm) out of this plane [279, 293],... 

The crystal structure of [Ir(CO)(diphos)2]+ has been determined. The iridium atom is in a distorted trigonal bipyramidal environment (150). 

In analogous fashion, the ruthenium- or iridium-based bimetallic and trimetallic CTV complexes such as 54-57 also make excellent anion hosts. The CTV cavity, however, is wider and more shallow and hence, the BF anion is too small to be effectively bound. This is evidenced by the crystal structures of the BF J salts of 56 and the iridium analogue 57 in which the anion within the cavity is either extremely disordered or is situated to one side of the cavity. We have found that host 54 exhibits a pronounced selectivity for TcO in nonaqueous solutions, presumably as a consequence of the wide cavity in conjunction with the larger anion size.104,109 Indeed, the X-ray crystal structure of the mixed ReO CFjSOj salt shows the... 

Iridium is the densest of all elements and its metal is lustrous, silvery, and very hard. The metal has the face-centered cubic crystal structure. Iridium has two stable isotopes 191Ir (37.3%) and 193Ir (62.7%). 

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