Solid-state compounds

Independently of the substitution, in the solid state compounds 126 (X = N) were found to exist exclusively as N(1)H tautomers 126a [88H(27)2201]. 

Basically, when analysing the band structures, the equivalent observations apply to typical solid state compounds like thallium halides and lead chalcogenides. In studies on the origin of distortion in a-PbO, it was found that the classical theory of hybridization of the lead 6s and 6p orbitals is incorrect and that the lone pair is the result of the lead-oxygen interaction [44]. It was also noted... 

Zinc squarate (C4O42 ) can form a solid state compound with a layered structure when DMSO is present, [Zn(C404)(OH2)2(DMSO)2]. The DMSO occupies the axial positions at the six-coordinate zinc center and prevents formation of a 3D cage network. The compounds are insoluble at room temperature but are converted into the 3D cage network [Zn(C404)(0H2)2] by heating in aqueous media.385... 

The monomeric compound bis(phenyltellurido)(TMEDA) zinc has been synthesized with, once again, a particular interest in the controlled deposition of a pure solid state compound, in this case ZnTe nanocrystals.3 y... 

The infrared (IR) spectra of these compounds have been mostly studied in the solid state. Compounds related to 4, where R can be varied, show the absorption bands in the regions 3200-3260 and 1670-1700cm-1 due to the NH and C=0 groups, respectively <2000JPR342>. For compounds 5 and 6, the C=0 absorption appeared at v 1679 cm-1, whereas the NH absorption band appeared at v 3034 cm-1 <2003PS2055>. The IR spectrum of 7 in addition to the absorption band of the C=0 at v 1690 cm-1 also showed a (C=S) absorption band at 1177 cm-1 <2003PS2055>. 

Ternary acetylides of the composition M[M (C2)J, M = alkali metal, M = transition metal, are solid-state compounds, which depending upon their composition may exhibit either insulator or semi-conductor behavior. 

Descriptors are vectors or scalars that describe certain properties of a molecular or solid-state compound (the descriptors for molecular compounds are also described as SMILES or broad... 

Figure 11.2 List of descriptors that can be employed for describing molecular and solid-state compounds.

Although Lappert et al. reported on the isolation of the purple dialkylplumbylene 65 as early as 1973, its structure has only recently been determined. In the solid state, compound 65 exists as a loosely bonded dimer with a second plumbylene molecule and has a Pb- -Pb separation of 412.9 pm, with trans-bent angles between the PbC2 plane and the Pb- -Pb vector of 34.2°.82... 

Some of the homoatomic polyanions formulated for solid state compounds are also stable in solution, and even new polyanions are accessible by crystallization from these approaches. The final chapter summarizes homoatomic polyanions of group 14 and group 15, which have been reported in solvate structures. 

Homoatomic Polyanions of Group 14 Elements in Solid State Compounds... 

Table 1 Solid state compounds that contain nonatetrelide clusters...

Table 3 Reported homoatomic rings in alkali/alkaline earth metal containing solid state compounds of group 14 elements...

A further enhanced degree of reduction leads to chains of group 14 elements with Ne values between 6 and 6.6 e/atom. These values cover the range between twofold bound silicon atoms in one-dimensionally extended zigzag chains and 2 dumbbells. Isolated chains reside in between these border structures and therefore compete with them [14]. This leads to the expectation of an extreme cation size dependence of the anion formation. Table 4 contains the reported isolated homoa-tomic chains in solid state compounds. 

Table 4 Homoatomic chains of group 14 elements in solid state compounds...

Table 5 Charge of group 14 chains in solid state compounds according to the chemical formula compared to the charge expected for ZintZ-compliant a-bonded chains...

An increased value results in the formation of isolated rings of group 15 elements in solid state structures. Besides these rings, of course two-dimensionally extended layers and one-dimensionally extended chains are observed, according to the 8-N rule for these values. In Table 7, solid state compounds are hsted in which homoatomic rings are present in the crystal structure. 

There are three kinds of rings of different nuclearity known for homoatomic group 15 anions (Fig. 7). For arsenic, three-, five-, and six-atom rings are described in solid state compounds, and for phosphorus only the six-atom ring is reported, whereas for antimony and bismuth no homoatomic rings are known in neat solid state materials of alkali and alkaline earth metals. 

Fig. 7 Rings of group 15 elements in solid state compounds of alkali and alkaline earth metals...

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