Crystalline Ammonium Complexes of Trimethyl‐ and Triethylbenzene‐Based Tripodal Compounds Bearing Pyrazole and Indazole Groups

Abstract

Crystalline complexes of NH4+PF6– with trimethyl‐ and triethylbenzene‐based tripodal compounds, bearing either pyrazole or indazole groups, were prepared and characterized by X‐ray diffraction studies. The supramolecular motifs observed in the crystal structures and the conformations of the tripodal molecules have been the subject of a detailed analysis and are described in this paper. The pyrazole‐bearing side arms of the hosts with a trimethylbenzene scaffold are arranged in an aaa fashion and form a cavity including the ammonium ion. In the case of the triethylbenzene derivatives, the fully alternating arrangement of the pyrazole/indazole and ethyl groups is observed and by taking the ethyl groups into account, the conformation can be defined as ab′ab′ab′. The conformations observed in the crystals of the free host molecules can be defined as ab′ab′ba′ with the indazole‐bearing arms arranged in an aab fashion. The crystal packings of the complexes are, among other things, characterized by the presence of NH···F and CH···F hydrogen bonds as well as by CBr···N and CBr···π halogen bonds in the case of the bromo‐substituted derivatives.

Syntheses of Acyclic and Macrocyclic Compounds Derived from 9,9‐Diethylfluorene (Part I)

“…185-187°C. 1 H NMR (500 MHz, CD 3 OD): δ = 0.21 (t, J = 7.4 Hz, 6H), 2.19 (q, J = 7.4 Hz, 4H), 6.05 (s, 4H), 6.55 (s, 2H), 7.31 (s, 1H), 7.64 (dd, J = 8.0/1.3 Hz, 1H), 7.85 (s, 1H), 7.91 (s, 1H), 7.94 (d,J = 8.0 Hz,1H),4H), 8. 22-8.25 (m, 2H), 8.64-8.70 (m, 2H), 8.70-8.74 (m, 1H), 9.12 (d, J = 5.8 Hz, 2H), 9.25 (d, J = 6.3 Hz, 4H) ppm.…”

“…124-126°C. 1 H NMR (500 MHz, CD 3 OD): δ = 0.18 (t, J = 7.3 Hz, 6H), 2.04-2.12 (m, 4H), 3.23 (s + s, 8H), 3.39 (s, 4H), 3.82 (s, 4H), 4.26 (s, 2H), 7.35 (d, J = 1.5 Hz, 1H), 7.38 (dd, J = 8.0/1.7 Hz, 1H), 7.40 (d, J = 1.5 Hz, 1H), 7.45 (d, J = 1.7 Hz, 1H), 7.94 (d,J = 8.0 Hz,1H) ppm. 13 C-NMR (125 MHz, CD 3 OD): δ = 8.…”

“…1 H NMR (500 MHz, CDCl ): δ = 0.27 (t, J = 7.3 Hz, 6H), 1.98 (q, J = 7.3 Hz, 4H), 4.76 (s, 2H), 4.79 (s, 2H), 5.09 (s, 2H), 6.10-6.12 (m, 1H), 6.17-6.19 (m, 1H), 6.20-6.23 (m, 1H), 6.39-6.42 (m, 1H), 6.48-6.50 (m, 1 H), 6.52-6.54 (m, 1 H), 6.58-6.60 (m, 1 H), 6.76-6.78 (m, 1 H), 6.81-6.83 (m, 1 H), 7.13 (s, 1H), 7. 21-7.25 (m, 2 H), 7.27 (s, 1H), 7.71 (d,J = 7.8 Hz,1H),8.02 (s,1H),8.15 (s,1H), 8.18 (s, 1H) ppm. 13 C NMR (125 MHz, CDCl 3 ): δ = 8.…”

“…162-164°C. 1 H NMR (500 MHz, CDCl 3 ): δ = 0.33 (t, J = 7.1 Hz, 12H), 2.01 (q, J = 7.1 Hz, 8H), 4.90 (s, 8H), 7.26-7.28 (m, 8H), 7.48 (t, J = 7.6 Hz, 2H), 7.65 (d, J = 7.8 Hz, 4H), 7.90 (d,J = 7.6 Hz,4H),8.16 (s,2H), 8.45 (s, 4H) ppm. 13 C NMR (125 MHz, CDCl 3 ): δ = 8.…”

“…127-128°C. 1 H NMR (500 MHz, CDCl 3 ): δ = 0.24 (t, J = 7.3 Hz, 6H), 1.98 (q, J = 7.3 Hz, 4H), 5.32 (s, 2H), 5.33 (s, 2H), 5.66 (s, 2H), 6.62 (s, 1H), 7.13 (dd, J = 8.0/1.5 Hz, 1H), 7.18(d, J = 1.5 Hz, 1H), 7.20-7.22 (m, 2H), 7.38-7.40 (m, 2H), 7.51-7.52 (m, 2H), 7.54(d, J = 8.0 Hz, 1H), 1H) ppm 13. C NMR (125 MHz, CDCl 3 ): δ = 8.…”