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Reaction of Ph2SnCl2 with 1,3-bis(3,5-dimethylpyrazol-1-yl)-2-propanol (L) in a 1:1 ratio yields L(SnPh2Cl2)2 adduct, which partly hydrolyzes to the title complex (C25H31Cl3N4OSn, Mr = 628.58) during crystal growing in the air. The title complex is of monoclinic, space group P21/n with a = 9.0338(9), b = 17.890(1), c = 17.340(1) Å, β = 95.533(1)o, V = 2798.9(5) Å3, Z = 4, Dc = 1.492 Mg/m3, λ(Mo Kα) = 0.71073 Å, μ = 1.224 mm−1, F(000) = 1272, R = 0.023, wR = 0.054 for 4212 observed reflections with I ≥ 2σ( I). The crystal structure indicates that there is no direct interaction between the pyrazolyl ligand and the tin atom, but this complex forms a supramolecular structure through weak intermolecular C–H⋯Cl and O–H⋯Cl hydrogen bonds. Reaction of Ph2SnCl2 with 1,3-bis(3,5-dimethylpyrazol-1-yl)-2-propanol (L) in a 1:1 ratio yields L(SnPh2Cl2)2 adduct, which partly hydrolyzes to (PzCH2CHOHCH2PzH)·(Ph2SnCl3) (Pz = 3,5-dimethylpyrazol-1-yl) during crystal growing in the air. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

The perchlorate salt of diprotonated 5,8-dimethoxy-2,3-bis(2-pyridyl)quinoxaline, [C20H18N4O2]·(ClO4)2 ·(H2O)2 (1), has been prepared and characterized by 1H NMR, IR, UV–Vis, and elemental analysis, and established by X-ray diffraction technique. In the crystal structure of the title compound, two pyridinio rings form dihedral angles of 38.7(6)° and 26.5(5)° with the mean quinoxaline plane, and a dihedral angle of 52.7(6)° with each other. It is unexpected that the favorite orientation of two protonated pyridyl rings is such that their nitrogen donors are opposite to each other (trans–trans configuration). The most striking feature of this structure resides in the fact that numerous hydrogen-bonding interactions are observed, resulting in a novel double-chain supramolecular architecture along crystallographic [111] direction. There exist significant face-to-face p–p stacking interactions between the interchain neighboring pyridinio rings, which may further stabilize this structure. [ABSTRACT FROM AUTHOR]