Structures and Non-linear Optical Properties of Multi-Sulfur π-Conjugated Compounds 4,5-Vinylenedithio-1,3-dithiole-2-thione (C5H2S5) and 4,5-Vinylenedithio-1,3-dithiole-2-one (C5H2OS4)
作者:Gang Xue、Qi Fang、Wen-Tao Yu、Xia Chen、Hong Lei
DOI:10.1007/s10870-007-9291-9
日期:2008.1
Both the title multi-sulfur molecules C5H2S5 (1) and C5H2OS4 (2) have a chair conformation, while molecule 1 has a higher degree of π-conjugation. Both the crystals are characterized by short S···S intermolecular contacts and by face-to-face column-like packing style, but crystal 1 has been more stabilized which may be the result of its stronger π–π intermolecular interactions. Compound 1 crystallizes in non-centrosymmetric polar space group Pmn21 with a = 10.6826(17), b = 9.3633(11), c = 4.0764(6) Å, V = 407.74(10) Å3, and Z = 2. The molecular dipole moment of 1 is ±62.5(1)° away from the macro-polarization direction along the c-axis. Consequently, the crystalline powder of crystal 1 exhibit a second harmonic generating (SHG) intensity 0.5 time strong as that of urea standard powder crystals when irradiated by a 1,080 nm of Nd:YAP laser beam. Compound 2 shows no SHG effect because it crystallizes in centrosymmtric space group Pbca with a = 11.4208(8), b = 7.8843(9), c = 33.587(3) Å, V = 3024.3(5) Å3, and Z = 16. Structures and Non-linear Optical Properties of Multi-Sulfur π-Conjugated Compounds 4,5-Vinylenedithio-1,3-dithiole-2-thione (C5H2S5) and 4,5-Vinylenedithio-1,3-dithiole-2-one (C5H2OS4) Gang Xue, Qi Fang,* Wen-Tao Yu, Xia Chen, and Hong Lei Compound C5H2S5 crystallizes in the polar space group Pmn21 and its crystalline powder exhibits a second harmonic generating (SHG) intensity 0.5 times that of urea standard (1080 nm → 540 nm), while the similar compound C5H2OS4 has no SHG effect because of its centrosymmetric space group Pbca.
标题中的多硫分子 C5H2S5 (1) 和 C5H2OS4 (2) 都具有椅状构象,而分子 1 的π-共轭程度更高。这两种晶体的特点都是短的 S-S 分子间接触和面对面的柱状堆积方式,但晶体 1 更加稳定,这可能是由于其分子间的π-π 相互作用更强的缘故。化合物 1 在非中心对称极性空间群 Pmn21 中结晶,a = 10.6826(17), b = 9.3633(11), c = 4.0764(6) Å, V = 407.1 的分子偶极矩沿 c 轴偏离宏观极化方向 ±62.5(1)° 。因此,当用波长为 1,080 nm 的 Nd:YAP 激光束照射晶体 1 的结晶粉末时,其二次谐波发生(SHG)强度是尿素标准粉末结晶的 0.5 倍。化合物 2 没有显示出 SHG 效果,因为它结晶于中心空间群 Pbca,a = 11。4208(8), b = 7.8843(9), c = 33.587(3) Å, V = 3024.3(5) Å3, Z = 16.多硫π共轭化合物 4,5-乙烯二硫-1,3-二硫杂环戊烯-2-硫酮 (C5H2S5) 和 4,5-乙烯二硫-1,3-二硫杂环戊烯-2-酮 (C5H2OS4) 的结构和非线性光学性质 Gang Xue、C5H2S5 在极性空间群 Pmn21 中结晶,其结晶粉末的二次谐波发生(SHG)强度为 0.5 times of urea standard (1080 nm → 540 nm), while the similar compound C5H2OS4 has no SHG effect because its centrosymmetric space group Pbca.