Indium atom

E.15 What mass of rhodium contains as many atoms as there are (a) gallium atoms in 36 g of gallium (b) indium atoms in 36 g of indium ... 

Starting with PdMe2(TMEDA) and InCp, a tripalladium species (Equation (86))74 that is completely ligated by InCp units is formed. The Pd3 arrangement is essentially linear (169.52(5)°) and each Pd atom is tetrahedrally coordinated by four indium atoms. The Pd-Pd distances are 277.62(14) and 277.47(14) pm. 

The rather complicated indium-phosphorus cluster framework 24 was obtained by the reaction of indium(III) chloride with PhP(SiMe3)2 in the presence of triethyl-phosphane [Eq. (12)] [29]. Apparently, a complex redox process occurred, in the course of which phosphorus atoms were oxidized by the formation of three P-P bonds, while six indium atoms were reduced from +3 to +2 accompanied by the formation of three In-In bonds. The In-In (average 274 pm) and P-P bond lengths (average 222 pm) represent localized single bonds. Other strategies for the... 

The structure of 51-(THF)4 consists of two ort/io-phenylene indium dichloride moieties linked through a central Hg atom, giving rise to a pseudo-centric core (Fig. 16). The mercury atom is, as expected, linearly coordinated. Each indium atom is penta-coordinated in a trigonal-bipyramidal fashion with two THF molecules at the axial positions and two chloride ligands as well as a phenylene ring at the equatorial sites. 

Unlike InCl, InBr reacts cleanly with 50 in THF to afford the tetrakis(IH ) adducts of 9,10-dibromo-9,10-dihydro-9,10-diindaanthracene 52 in high yield (Scheme 21). Compound 52 crystallizes as a tetrakw(THF) adduct with two independent molecules in the unit cell. Both molecules are centrosymmetric (Fig. 17). Each indium atom is pentacoordinated in a trigonal-bipyramidal fashion, with two molecules of THF at the axial positions. Upon standing in a dry inert atmosphere, 52-(THF)4 readily loses two equivalents of THF to afford 52-(THF)2 as indicated by elemental analysis. 

A square pyramidal geometry around a central group 13 metal is also enforced by phthalocyanines (Pc). These are of the general formula PcMX (where M = Al, Ga, In, and X = alkyl or halide). In the structure of PcInI, the indium atom is 0.74 A above the N4 plane (Fig. 14e) [94]. 

Among the first to be described was the iminoindane complex [ MeIn(NC6H4F-4)-(thf) 4] prepared as shown in Scheme 8.1. The framework consists of a distorted cube with In and N atoms at alternating corners (In—N bond lengths are between 2.19 and 2.41 A). The distorted trigonal pyramidal coordination geometry at each indium atom is... 

Indium(III) alkoxides are readily prepared by the treatment of trihalide with NaOR.127 The chemistry of these compounds has been little studied, no doubt because they are insoluble materials in which the indium atom optimizes its coordination number by cross-linking via oxygen. The isopropoxides of aluminum and gallium react128 with In(OPr )3 to give In[M(OPr )4]3 (M = A1, Ga) which are volatile and monomeric in solution. The structure involves six-coordination at the smaller metal centre. 

A series of earlier papers on complexes of indium(III) with porphyrins,265 and phthalocyanines266-268 has been summarized earlier.7 The structures InLX (L = substituted porphyrin X = Cl, OAc, OPh) imply a square pyramidal stereochemistry with the indium atom situated above the ligand N4 system, and this has been confirmed by X-ray crystallography for X = C1269 and X = Me,270 but for X = MeOS02, the indium atom is in the plane of the four nitrogen atoms.271 A number of Schiff base derivatives have recently been described.272... 

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