The Bond-Type Triangle

Model 1 The Relationships Between Electronegativities and the Physical Properties of Compounds and Metals. 

Compound or Metal first atom EN second atom EN AEN Melting Point (°C) Type of Bonding 

Based on the data in Table 1, what combination of AEN values and EN values leads to metallic bonding  

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Verify that the points for CsF, F2, and Cs are at the appropriate positions on the bond-type triangle. 

Quartz, Si02, is a very high melting, hard solid. Place a point for Si02 on the bond-type triangle. What type of bonding would you predict to be predominant in quartz ... 

For each of the following compounds, place a point on the bond-type triangle. Classify each compound as metallic, covalent, ionic, semimetal. 

In the bond-type triangle below, the position of the compound SnLt is indicated with an arrow. Which point (A, B, C, or D) is most likely to correspond to AgCl Explain your reasoning clearly. 

W. B. Jensen, The historical development of the van Arkel bond-type triangle , Bull. Hist. Chem., 1992-93, 13-14, 47-59. 

The classification of amorphous carbon films according to carbon bond type and hydrogen content can be represented in a triangular diagram, Fig. 6 [e.g., 70]. The comers at the base of the triangle correspond to graphite (100% sp carbon) and diamond (100% sp carbon). The apex represents 100% H, but the upper limit for formation of solid films is defined by the tie line between the compositions of polyethene, -(CH2) -, and polyethyne, -(CH) -. 

The second type of trinuclear compounds containing (M302(02CR)(,(H20)3] and obtained by the reaction of M(CO)6 (M = Mo, W) with carboxylic acids, features a similar triangle of M-M bonded metal atoms but this time capped on both sides by hj-O atoms (Fig, 23.8d). Complexes m which either one or both of these capping atoms arc replaced by /iy-CR, alkylidene. 

Comparison of Figs. 3.105(a) and 3.106(a) shows that the role of the apical Bi atom differs markedly in the two cases. In the central case (Fig. 3.105(a), Bi has no privileged role but merely contributes one of the three near-equivalent hybrids directed into the midpoint of the triangle. However, in the open case (Fig. 3.106(a)) Bi uniquely contributes a pure p orbital whose two lobes are overlapped by the end borons, forming an open chain with distinct center (Bi) and end (B3 and B5) links. Whereas the central-type Tbbb(c) bond resists breaking up the triangular... 

Figure 8.4 Schematic representation of the different types of silica-surfactant interface. Solvent molecules are not shown, except for the I °S° case (triangles) dashed lines correspond to H-bonding interactions. Reproduced with permission from [5 ]. Copyright (2002) American Chemical Society...

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