Design, synthesis and noncentrosymmetric solid state organization of three novel pyridylphosphonic acids
作者:Jerzy Zon、Veneta Videnova-Adrabinska、Jan Janczak、Magdalena Wilk、Anna Samoc、Roman Gancarz、Marek Samoc
DOI:10.1039/c1ce05140g
日期:——
Three pyridylphosphonic acids, 3-pyridylphosphonic acid 1, 5-(dihydroxyphosphoryl)nicotinic acid 2, and 3,5-pyridinediyldiphosphonic acid 3, were synthesized and structurally investigated by solid state FT-IR and single crystal X-ray diffraction methods. All compounds appear in zwitterionic forms in the solid state with a proton transferred from the phosphonic group toward the pyridine N-atom. Strong
三种吡啶基膦酸, 3-吡啶基膦酸 1,5-(二羟基磷酰基)烟酸 2和3,5-吡啶二基二膦酸 通过固态FT-IR和单晶X射线衍射法合成并在结构上研究了图3。所有化合物均以两性离子形式以固态形式存在,质子从膦酸基团向吡啶N原子转移。O–H hydrogenO和N–H⋯O强烈的氢键相互作用将化合物的分子组织成极性三维网络。晶体结构还可以通过较弱的C–H⋯O氢键和π⋯π或C O⋯π相互作用来稳定。还测量了粉末二次谐波的产生和溶液的NMR光谱。NMR谱图显示,官能团(PO和C O)的双键虽然与N py取向不同原子在溶液中的化合物1-3的所有稳定,低能构象物中都与芳环共面。在晶体中,然而,在P O键朝向环由10.77(7)°倾斜于1,70.42(8)°的2和43.97(7)°和6.56(8)°的3。与三种化合物相比,这三种化合物均显示出中等的粉末SHG效率。尿素。