Syntheses, crystal structures, and polymorphism of quaternary pyrrolidinium chlorides

The syntheses, properties, and X-ray crystal structures of 1-methyl-1-propylpyrrolidinium chloride 1, 1-allyl-1-methylpyrrolidinium chloride 2, and 1-methyl-1-propargylpyrrolidinium chloride 3 are described. Colorless plates of 1 (C8H18ClN) crystallize in the orthorhombic space group Pnab with Z = 8 and unit cell parameters a = 10.0354(11) Å, b = 13.254(2) Å, c = 14.6231(16) Å. Colorless prisms of 2 (C8H16ClN) crystallize in the monoclinic space group P21/c with Z = 4 and unit cell parameters a = 6.4857(10) Å, b = 12.005(3) Å, c = 12.526(2) Å, and ?=102.746(13) °. Colorless needles of 3 (C8H14ClN) crystallize in the monoclinic space group P21/n with Z = 4 and unit cell parameters a = 8.4849(14) Å, b = 8.1271(16) Å, c = 13.501(2) Å, and ?=100.408(13)°. The five-membered ring adopts a twisted conformation in 1 but an N-envelope in 2 and 3. The salts form networks of weak C-H ...Cl- hydrogen bonds. Hot stage microscopy, differential scanning calorimetry and temperature-controlled X-ray powder diffractometry revealed that each of the three compounds exists in at least two different crystal forms

Crystal structure of ?2-1-allyl-3-methylimidazolium trichloroplatinate(II), [C7H11N2][PtCl 3]

C7H11Cl3N2Pt, orthorhombic, P212121 (no. 19), a = 7.6873(2) Å, b= 11.9159(3) Å, c = 12.1398(3) Å, V=1112.0 Å3, Z = 4, Rgt(F) = 0.018, wRref(F2) = 0.045, T= 233 K

Crystal structure of bis(hydroxylammonium) 5,5?-azotetrazolate dihydrate, (NH3OH)2(C2N10) · 2H2O

C2H12N12O4, monoclinic, C12/c1 (no. 15), a = 20.620(4) Å, b = 4.3100(8) Å, c= 15.051(3) Å, ? = 124.30(1)°, V = 1105.0 Å3, Z = 4, R gt(F) = 0.028, wRref(F2) = 0.071, T= 173 K