Ternary halides

Another example of a divalent metal of this group, but which in fact is probably entirely analogous to the dihydiides, is LaL. However, the most extensive set of examples of these metals in low formal oxidation states is provided by the binary and ternary halides produced by... 

Harned s method, which has long been used to obtain the ternary halides required for the... 

Plutonium tribromide [1575246-2], PuBr3, and plutonium triiodide [134554)1 -1/, Pul3, both bright green solids, have no practical applications. Comprehensive reviews of the binary and ternary halides are available (147,154,155). 

A new ternary halide CaAg2H has been obtained as a black, diamagnetic compound either by hydriding CaAg2 alloy or by the solid state reaction between Ag and CaH2 in a H2 atmosphere. ... 

Halides. The author is aware of only one example of the preparation of a ternary halide in an electric discharge. Massey and Urch (36) obtained a very small sample of impure SiCl3BCl2 as a by-product from the mercury discharge synthesis of B0CI4. The silicon probably originated from the quartz discharge cell used. It appears that the essentially unexplored study of mixtures of halides in electric discharges is worthy of study. 

Table 3 Unit-cell parameters for a number of ternary halides...

In the simplest possible way we may define complex halides as all halides that contain more than one kind of cation and/or more than one kind of anion, with cation and anion standing for the less or more electronegative partners in one compound. Therefore, NdCl2 and NdCla, for example, are simple or binary halides and NdOCl and K2NdCl5 are complex halides. NdOCl is also called a mixed-anion halide. K2NdQ5 is normally referred to as a ternary halide, Cs2HaNd06 is then a quaternary halide, and so forth. 

After the derivatives of simple binary halides, we will discuss the formation and structures of ternary halides in the systems AX/RXz (with z = 2, 3 and with A an alkali metal, lithium through cesium, or an pseudo-alkali cation such as In, Tr, NHJ) and BX2/RXz (with B a divalent cation) and some mixed systems. Complex rare-earth halides have been reviewed eighteen years ago (Meyer 1982), so that we will focus on generalities and recent developments. 

In the reduced binary and ternary halides of the lanthanoids, the f electrons are well localized on the metal atoms. The coupling between the magnetic moments is weak in the case of insulators as can be seen from the low ordering temperatures of the saltlike trihalides whereby, for example, GdQj orders ferromagneti-cally at 2.2K. In the presence of extended M-M bonding, the conduction electrons provide a very efficient mechanism for coupling the moments via a RKKY... 

Additional areas of lanthanide halide chemistry that have been reviewed include the synthesis, phase studies, and structures of complex lanthanide halides - compounds formed between one or more group 1 cation and lanthanide element halides (Meyer 1982). Halides in combination with lanthanide elements in the II, III, and IV oxidation states were considered with the chemistry of the heavier halides being emphasized. More recently the reduced ternary lanthanide halides (Meyer 1983) and the reduced halides of the lanthanide elements were reviewed (Meyer 1988). The latter review considered lanthanides in which the formal oxidation state of the cation was 2 and included hydride halides, oxide halides, mixed-valence ternary halides, and reduced halide clusters. Corbett et al. (1987) discussed the structures and some bonding aspects of highly reduced lanthanide halides and compounds stabilized by a second-period element bound within each cluster, e.g., SC7CIJ2B, SC5CI5B, YjCljC. 

Ternary halides Compounds of three elements, of which two are metals and the third a halogen... 

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