The polymeric Co(Ⅱ) complex[Co(Hdhpc)(py)]_n(1)(py = pyridine,H_3dhpc =2,6-dihydroxypyridine-4-carboxyl acid) was prepared and characterized.X-ray diffraction data revealed that the compound crystallizes in dimorphic 1α and 1β forms at room and low temperature,respectively.The former crystallizes in the orthorhombic crystal system,space group Pbcm with a =7.209(1),b = 14.834(3),c = 15.376(3) ?,V= 1644.3(5) ?~3,Z = 4,C_(16)H_(13)CoN_3O_4,M_r = 370.22,D_c= 1.496 g/cm^3,F(000) = 756,μ = 1.068 mm^(-1),R = 0.0633 and wR = 0.1192.While 1β is attributed to the monoclinic space group C2/c with a = 32.102(4),b = 7.022,c = 14.945(2) ?,β = 109.052(5)°,V= 3184.4(6) ?~3,Z= 8,D_c= 1.544 g/cm^3,F(000) = 1512,μ = 1.103 mm^(-1),R = 0.0428 and wR =0.0797.The conformation changes of pyridines between Co-citrazinate planes leading to a reversible single-crystal to single-crystal transformation.The variable temperature magnetic data indicate a weak ferrimagnetism.
阿魏酸及其酰胺类化合物是一类具有重要生物活性和药理作用的天然产物及其衍生物.本论文以廉价易得的香兰素为原料,经克脑文盖尔(Knoevenagel)缩合反应得到阿魏酸(1).然后以N,N′-二环己基碳酰亚胺(DCC)为脱水剂,4-二甲氨基吡啶(DMAP)为催化剂,阿魏酸分别与8种芳香胺反应合成了8种阿魏酸酰胺类化合物2-9.其中7和8是未见文献报道的新化合物.所合成的阿魏酸酰胺类化合物通过核磁共振氢谱(1 H NMR)、核磁共振碳谱(13C NMR)、质谱(MS)和红外光谱(IR)进行了结构表征.该阿魏酸酰胺类化合物合成方法原料易得、工艺简便、收率较高.
