Crystal and molecular structures of N‐alkyl‐N, N‐dimethyl‐3‐(heptamethyltrisiloxan‐3‐yl) propylammonium bromides

C 16 H 42 NO 2 Si 3 Br: M r = 444.76, monoclinic space group P 2 1 /c, a = 23.300(8), b = 8.918(4), c = 13.403(2) Å, β = 101.69(4)°, V = 2727(1) Å 3 , D x = 1.08 Mgm −3 , D exp = 1.06 Mgm −3 , Z = 4, F (000) = 932, λ(MoKα) = 0.71069 Å, μ = 16.3 cm −1 . The crystal structure was determined by direct methods and refined by least‐squares procedure to the discrepancy factor R = 0.117. C 15 H 40 NO 2 Si 3 Br: M r = 430.34, monoclinic space group P2 1 /c, a = 23.460(4), b = 8.518(2), c = 13.403(2) Å, β = 102.03(2)°, V = 2619(1) Å 3 , D x = 1.09 Mgm −3 , D exp = 1.07 Mg −3 , Z = 4, F (000) = 920, λ(MoKα) = 0.71069 Å, μ = 33.9 cm −1 . The crystal structure was determined by least‐squares refinement of the structure model derived from structure determination of C 16 H 42 NO 2 ·Si 3 Br to the discrepancy factor R = 0.099. C 16 H 42 NO 2 Si 3 Br: Daten siehe oben. C 15 H 40 NO 2 Si 3 Br: Daten siehe oben.