2.3.1. [Tl(TmtBu)]2·2H2O

A solution of K(TmtBu) (0.5114 g, 0.991 mmol) in dichloromethane (15 mL) was added to a solution of thallium(I) acetate (0.2649 g, 1.006 mmol) in degassed ethanol (10 mL). After allowing the reaction to proceed overnight, the solvent was removed under reduced pressure, and the resulting solid was extracted by dichloromethane (15 mL). Colorless crystals were obtained by slow evaporation from a saturated dichloromethane/heptane (1:1 v/v) solution and were characterized crystallographically as [Tl(TmtBu)]2·2H2O (0.2820 g, 0.410 mmol, yield: 41%). Elemental analysis (bulk material): Anal. Calcd. for [Tl(TmtBu)]·1/3H2O: C 36.66, H 5.08, N 12.22%; Found: C 36.43, H 4.90 N 11.93%. IR (KBr, cm−1): 3147 w ν(C–H), 2975 m ν(C–H), 2922 w ν(C–H), 2455 w ν(B–H), 1626 m, 1560 w, 1407 m, 1396 m, 1357 s, 1273 m, 1199 s, 1165 m, 1099 m, 981 w, 737 w, 715 m, 682 m. Raman (cm−1): 3188 w (C–H), 3145 w ν(C–H), 2979m ν(C–H), 2959 m ν(C–H), 2922m ν(C–H), 2445 w ν(B–H), 1564 s, 1458 m, 1358 s, 1258 w, 1226 w, 1153 w, 1099 w, 1058 w, 1026 w, 931 w, 821 w, 716 w, 611 w, 564 w, 407 w, 314 w. 1H NMR (CDCl3, 298 K): 1.79 (s, 27H, CH3), 6.12 (3H, imidazole H), 6.86 (3H, imidazole H). 13C NMR (CDCl3, 298 K): 28.7 (CCH3), 58.5 (CCH3), 115.9 (imidazole C4 or C5), 123.1 (imidazole C4 or C5), 161.2 (imidazole C=S). UV–vis (CH2Cl2, 298 K; λmax, nm (ε, M<sup>−</sup>1cm−1)): 270 (20,700).
