Complexes of Other N-Donors

3 Complexes of other N-donors A range of pyridine complexes can be made [98] 

Apart from ethanol, other primary alcohols catalyse the formation of the dichloro complex, probably via a rhodium(I) intermediate rather than a rhodium(III) hydride. Rhpy4Xj compounds have anti-bacterial activity. 

Rh(N02)6 is of some importance in the traditional extraction of rhodium. Impure RhCl3 is neutralized and treated with NaN02 Na3Rh(N02)e is soluble under these conditions (though base metals precipitate), but when ammonium chloride is added, (NH4)3Rh(N02)6 precipitates. The potassiiun salt is similarly relatively insoluble. All these salts are believed 

The synthesis of Rhen, mentioned above, is again accelerated by a trace of ethanol catalyst 

It exists as optical isomers and was first resolved by Alfred Werner. The route to the bis complexes generates the ammine in situ and is applicable to other ammines (tren, trien, etc.) yielding principally the /ra/u-isomer 

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EPR data have been reported for 5-aryl tetrazolate salts of copper(II) values are in the range 2.12-2.15 and the gL and gy values are similar to those recorded for copper(II) complexes of other N donors. Related cobalt and nickel complexes gave complex or unresolved spectra (119). EPR data have been analyzed for the complex salts [Mn(l,5-pmtta)6][C104]2 and [Cu(l,5-pmtta) ][C104]2 (n — 4 and 6). For the copper complexes, copper and nitrogen hyperfine splittings were observed (118). 

Examples of template procedures in which the ring-closing condensation involves reaction at a centre other than a donor atom have been documented. In an early synthesis of this type, the reaction of bis-(dimethylglyoximato)nickel(n) (62) with boron trifluoride was demonstrated to yield the corresponding complex of the N4-donor macrocycle (63) (Schrauzer, 1962 Umland Thierig, 1962). In this reaction the proton of each bridging oxime linkage is replaced by a BF2+ moiety. X-ray... 

C6o fullerene is a new type of Ti-acceptors with a number of essential dissimilarities from another acceptor molecules large size, spherical form, unique electron structure, high symmetry and polarizability. These peculiarities introduce a certain specificity in donor-acceptor interactions in fullerene compounds. Fullerene is a rather weak acceptor. Adiabatic affinity for an electron in the solution is 2.1-2.2 eV [1]. One molecule of C60 fullerene can accept to 12 electrons [1-4] and donate one electron [5], i.e. the charge on a C60 molecule can vary from +1 to -12. Polarizability of a C60 molecule is high (a 85 A3) and several times greater than that of other n-acceptor molecules. Because of this, polarization Van der Waals forces are of essential importance in the formation of donor-acceptor complexes. 

Nitric Oxide Adducts of Other Complexes. Simple nitrosyl complexes containing a-N donor ligands are rare, as these hard bases do not allow the appreciable d-7t interaction required to stabilize the Fe-NO group. As a result, nitric oxide... 

In the case of reaction (j), the cationic product is converted to M(CO)2( >-triars)X2 by recrystallization from hot methanol (M = Mo, only). Other examples of halogen addition exist for Mo and W carbonyl complexes that contain N-donor ,P-donor " S and As-donor ligands. 

In addition to complexes with ON donor sets, complexes with bidentate N-donor atoms and other donors have been described. For example, after several solution studies the crystal structure of the bis(L-cysteine methyl ester)oxovanadium(IV) complex showed that the vanadium is coordinated by the amido nitrogens and thiolate sulfurs (128).561 The complexes and reactivity of a series of pyridine-2-thiolate complexes of V(IV, III, and II) have been characterized (129-131).651 The mass spectrometric fragmentation patterns of two of these complexes were investigated and show the formation of six 1 1 complexes and one 1 2 complex in the gas phase.651... 

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