4-(Dimethylamino)phenyl ethynyl telluride

Abstract

The title compound, C10H11NTe, is the first organyl ethynyl telluride, R—Te—C C—H, to be structurally characterized. In the L-shaped mol­ecule, the aryl moiety, viz. Me2NC6H4Te, is almost perpendicular to the Te—C C—H fragment. The Te—Csp 2 bond [2.115 (3) Å] is significantly longer than the Te—Csp bond [2.041 (4) Å]. The Te—C C group is approximately linear [Te—C—C = 178.5 (4)° and C C = 1.161 (5) Å], while the coordination at the Te atom is angular [C—Te—C = 95.92 (14)°]. In the crystal structure, there are Csp—H⋯N hydrogen bonds which are perpendicular to the CNMe2 group; the N atom displays some degree of pyramidalization. Centrosymmetrically related pairs of mol­ecules are linked by Te⋯π(ar­yl) inter­actions, with Te⋯Cg = 3.683 (4) Å and Csp—Te⋯Cg = 159.1 (2)° (Cg is the centroid of the benzene ring). These inter­actions lead to the formation of zigzag ribbons which run along c and are approximately parallel to (110).

Supramolecular Aggregation Patterns and Stereochemical Consequences of Tellurium(Lone Pair)…π(Aryl) Interactions

“…There are 13 examples of dimeric aggregates with data for these collated in Table 12.2 [27][28][29][30][31][32][33][34][35][36][37][38][39][40]; chemical diagrams for the interacting species are given in Scheme 12.3. Basically, the dimeric aggregates fall into two classes, namely where the aggregate is sustained by a single Te(lone pair)···π (aryl) contact, that is, 9 and 10, illustrated in Figure 12.2a [28], and the remaining examples that are sustained by two Te(lone pair)···π (aryl) contacts, that is, 11-22, usually formed between centrosymmetrically related molecules, as exemplified in Figure 12.2b for 13 [31].…”

“…Basically, the dimeric aggregates fall into two classes, namely where the aggregate is sustained by a single Te(lone pair)···π (aryl) contact, that is, 9 and 10, illustrated in Figure 12.2a [28], and the remaining examples that are sustained by two Te(lone pair)···π (aryl) contacts, that is, 11-22, usually formed between centrosymmetrically related molecules, as exemplified in Figure 12.2b for 13 [31]. The values of d range from 3.47 to 3.98Å cf.…”