Synthesis, Characterization and Crystal Structure of Thiadiazoles Derived from Aroylthiourea
作者:Durga P. Singh、Seema Pratap、Ray J. Butcher、Sushil K. Gupta
DOI:10.1007/s10870-013-0488-9
日期:2014.3
Three thiadiazole derivatives, (Z)-N-(2H-[1,2,4]thiadiazolo[2,3-a]pyridine-2-ylidine)benzamide (I), (Z)-N-(2H-thiazolo[3,2-b] [1,2,4] thiadiazolo-2-ylidine)thiophene-2-carboxamide(II) and (Z)-N-(2H-[1,2,4] thiadiazolo[2,3-a]pyridine-2-ylidine)thiophene-2-carboxamide(III), have been synthesized and examined by X-ray crystallography and NMR spectroscopy. I, C13H9N3OS, is monoclinic with space group P21/n and cell constants a = 6.2699(11) Å, b = 18.025(4) Å, c = 10.207(2) Å, β = 95.088(19)°, V = 1149.0(4) Å3 and Z = 4. II, C9H5N3OS3, is orthorhombic with space group Pbca and cell constants a = 12.52148(17) Å, b = 11.27270(18) Å, c = 14.9154(3) Å, V = 1370.3(7) Å3 and Z = 8. III, C11H7N3OS2, is monoclinic with space group P21/c, and cell constants a = 10.9171(15) Å, b = 18.227(2) Å, c = 11.8019(16) Å, β = 108.955(14)°, V = 1370.3(7) Å3, Z = 8. In III, two independent molecules crystallize in the asymmetric unit (Z = 2). The pyridothiadiazole fused ring in I and III, and thiazolothiadiazole fused ring in II, are planar with a maximum deviation of 0.012(3) (I), 0.011(2) and 0.006(3) (III) and 0.029(1) (II) Å, respectively. The dihedral angle between mean planes of the pyridothiadiazole ring and benzamide and thiocarboxamide rings are 3.48(13)°(I), 0.97(25)° and 3.68(31)° (III) while in between thiazolothiadiazole ring and thiocarboxamide ring in II is, 5.27(12)°. The thiophene rings in II and III are disordered over two sets of site in a 0.5028(19): 0.4972(19) (II) and 0.624(4):0.376(4) (molecule A) and 0.710:0.290(4) (molecule B) ratio (III). Weak C–H···O, C–H···N (I and II) and C–H···O (III) intermolecular hydrogen bond interactions help to stabilize crystal packing in each of their unit cells. It is also supported by weak intermolecular Cg···Cg π···π and C–H···Cg π-ring interactions which gives additional support to molecular packing stability leading to supramolecular layers. Synthesis, spectroscopic studies and crystal structures of three thiadiazole derivatives.
(Z)-N-(2H-[1,2,4]噻二唑并[2,3-a]吡啶-2-基啶)苯甲酰胺(I)、(Z)-N-(2H-噻唑并[3,2-b] [1,2,4]噻二唑并-2-基啶)噻吩-2-甲酰胺(II)和(Z)-N-(2H-[1、合成了 (Z)-N-(2H-[1,2,4]噻二唑并[2,3-a]吡啶-2-基啶)噻吩-2-甲酰胺(III),并通过 X 射线晶体学和核磁共振光谱进行了检验。I, C13H9N3OS, 为单斜晶系,空间群为 P21/n,晶胞常数 a = 6.2699(11) Å, b = 18.025(4) 埃,c = 10.207(2) 埃,β = 95.088(19)°,V = 1149.0(4) 埃3,Z = 4。C9H5N3OS3 是正方晶系,空间群为 Pbca,晶胞常数 a = 12.52148(17) Å, b = 11.27270(18) Å, c = 14.9154(3) Å, V = 1370.3(7) Å3 和 Z = 8.C11H7N3OS2 是单斜晶体,空间群为 P21/c,晶胞常数 a = 10.9171(15) Å, b = 18.227(2) Å, c = 11.8019(16) Å, β = 108.955(14)°, V = 1370.3(7) Å3, Z = 8.在 III 中,两个独立的分子在不对称单元中结晶(Z = 2)。I 和 III 中的吡啶噻二唑融合环以及 II 中的噻唑噻二唑融合环均为平面,最大偏差分别为 0.012(3) (I)、0.011(2) 和 0.006(3) (III) 以及 0.029(1) (II) 埃。吡啶噻二唑环与苯甲酰胺环和硫代甲酰胺环的平均平面之间的二面角分别为 3.48(13)°(I)、0.97(25)° 和 3.68(31)°(III),而 II 中的噻唑噻二唑环与硫代甲酰胺环之间的二面角为 5.27(12)°。II 和 III 中的噻吩环在两组位点上的无序度为 0.5028(19)°:0.4972(19)(II)和 0.624(4):0.376(4)(分子 A)和 0.710:0.290(4)(分子 B)的比例(III)。弱的 C-H--O、C-H--N(I 和 II)和 C-H--O(III)分子间氢键相互作用有助于稳定它们各自单元格中的晶体堆积。分子间弱的 Cg-Cg π--π和 C-H-Cg π--环相互作用也为超分子层的分子堆积稳定性提供了额外的支持。三种噻二唑衍生物的合成、光谱研究和晶体结构。