Showing papers by "Doyle Britton published in 2001"
TL;DR: In this article, two halobenzylidene compounds are shown to have two-dimensional sheets similar to those in the iodo analog, but with a different stacking arrangement between the sheets.
Abstract: p-Bromo-N-(p-cyanobenzylidene)aniline is triclinic, has space group P\(\overline 1\), at 173 K, with a = 7.3892(15), b = 12.087(2), c = 7.0283(14) A, α = 105.24(2), β = 98.11(2), γ = 98.89(2)°, Z = 2, V = 587.4(2) A3. p-Chloro-N-(p-cyanobenzylidene)aniline is triclinic, space group P\(\overline 1\), at 173 K, with a = 7.317(2), b = 12.165(3), c = 6.990(2) A, α = 104.02(2), β = 100.96(2), γ = 100.76(2)°, Z = 2, V = 574.7(3) A3. p-Cyano-N-(p-bromobenzylidene)aniline is orthorhombic, has space group P212121, at 173 K, with a = 10.333(3), b = 4.732(3), c = 23.526(5) A, Z = 4, V = 1150.3(8) A3. p-Cyano-N-(p-chlorobenzylidene)aniline is orthorhombic, has space group P212121, at 173 K, with a = 10.161(2), b = 4.713(2), c = 23.509(5) A, Z = 4, V = 1125.8(4) A3. In the two cyanobenzylidene compounds there are chains of molecules held together by CN······X interactions. The chains form two-dimensional sheets similar to those in the iodo analog, but with a different stacking arrangement between the sheets. In the two halobenzylidene compounds there are no CN······X contacts; rather there are short X······X and C–H······NC contacts.
9 citations
TL;DR: The 1:2:2 tetraglyme/dichloropicric acid/water adduct is monoclinic, space group C2/c; at 172(2) K, a = 30.529(6), b = 5.4210(11), c = 25.413(5) A, β = 122.33(3)°, Dx = 1.93(3), γ = 92.637(6) g cm−3, V = 1731.7(12) A3, and Z
Abstract: The 1:2:2 triglyme/dichloropicric acid/water adduct is triclinic, space group P\(\overline 1\); at 172(2) K, a = 4.9210(10), b = 13.424(3), c = 14.068(3) A, α = 115.04(3), β = 90.93(3), γ = 92.24(3)°, Dx = 1.600(5) g cm−3, V = 840.8(3) A3, and Z = 1. Each water molecule is hydrogen bonded to a terminal OCH3 group of one polyether and to an oxygen adjacent to an OCH3 of a neighboring polyether, resulting in two-dimensional ribbons. These ribbons, in turn, are assembled into a three-dimensional structure held together by chains of dichloropicric acid molecules connected to each other through chlorine–nitro group oxygen intermolecular interactions. The picric acid chains are attached to the water–polyether ribbons by hydrogen bonds from the picric acid to the water. The 1:2:2 tetraglyme/dichloropicric acid/water adduct is monoclinic, space group C2/c; at 172(2) K, a = 30.529(6), b = 5.4210(11), c = 25.413(5) A, β = 122.33(3)°, Dx = 1.597(3) g cm−3, V = 3553.7(12) A3, and Z = 4. The hydrogen bonding pattern resembles that of the analogous 1:2:2 pentaglyme complex reported previously, with the exception that both of the lone pairs of the central oxygen atom participate in hydrogen bonding to protons of water molecules. The second water proton is hydrogen bonded to a terminal OCH3 group. In this complex the dichloropicric acid molecules form a two-dimensional layer through chlorine–nitro group oxygen intermolecular interactions. The water molecules bond each isolated polyether molecule to adjacent dichloropicric acid layers. The 1:4:4 nonaglyme/dichloropicric acid/water complex is triclinic, space group P\(\overline 1\); at 172(2) K, a = 8.0830(16), b = 13.570(3), c = 16.751(3) A, α = 102.01(3), β = 102.39(3), γ = 96.43(3), Dx = 1.637(6) g cm−3, V = 1731.5(6), and Z = 1. The hydrogen bonding pattern is similar to that in the pentaglyme complex, except that four dichloropicric acid molecules and four water molecules are coordinated to a single polyether, and the polyether chain is appreciably disordered. In this case there are again chains of dichloropicric acid molecules held together by intermolecular chlorine–oxygen interactions. The chains are packed into two-dimensional layers held together through hydrogen bonds to water. Each isolated polyether is connected to four water molecules, two attached to dichloropicric acid molecules in one layer and the other two connected to the adjacent layer.
3 citations
TL;DR: The Tl2(CH3)4(C15H11O2)2 compound as mentioned in this paper contains two five-coordinate Tl atoms, which have essentially the same geometry except for the rotations of the phenyl rings.
Abstract: The title compound, [Tl2(CH3)4(C15H11O2)2], contains two five-coordinate Tl atoms. Two crystallographically independent molecules, symmetries 1 and \overline 1, have essentially the same geometry except for the rotations of the phenyl rings. The Tl—O distances in the monomer chelate ring average 2.467 (15) A. The Tl—O distances between the two monomer units average 2.78 (2) A. The Tl—C distances average 2.123 (11) A. The Tl atoms are not coplanar with the chelate rings. The independent molecules are related by an approximate pseudosymmetry.
2 citations
TL;DR: The title compound of as mentioned in this paper is a four-membered cyclamer held together by I⋯CN intermolecular Lewis acid-base interactions with the same bond lengths and angles within experimental error.
Abstract: The title compound packs with two crystallographically independent molecules, both symmetry 1, with the same bond lengths and angles within experimental error. The molecules form a four-membered cyclamer held together by I⋯CN intermolecular Lewis acid–base interactions. The two independent N⋯I distances are 3.263 (6) and 3.344 (6) A. The independent molecules are not related by any pseudosymmetry.
1 citations