Exchange Interactions between Two Nitronyl Nitroxide or Iminyl Nitroxide Radicals Attached to Thiophene and 2,2'-Bithienyl Rings
作者:Teruyuki Mitsumori、Katsuya Inoue、Noboru Koga、Hiizu Iwamura
DOI:10.1021/ja00114a010
日期:1995.3
bis(nitrony1 nitroxide) and bis(iminy1 nitroxide) diradicals having thiophene (2,4NT, 2,5NT, 2,4IT, and 2,5IT) and 2,2'-bithienyl units (4,4'NB, 3,3'NB, 4,5'IB, and 5,5'IB) as couplers were pre ared. Both 2,5NT and 4,4'NB crystallized in monoclinic space group P2l/n with a = 12.430(2) A, b = 13.968(4) 1, c = 12.470(2) A, /3 = 107.26(1)", and Z = 4 and with a = 10.766(7) A, b = 10.186(3) A, c = 11.625(4)
八个具有噻吩(2,4NT、2,5NT、2,4IT 和 2,5IT)和 2,2'-二噻吩基单元(4,4'NB、3、 3'NB、4,5'IB 和 5,5'IB) 作为偶联剂被预先制备。2,5NT 和 4,4'NB 在单斜空间群 P2l/n 中结晶,a = 12.430(2) A, b = 13.968(4) 1, c = 12.470(2) A, /3 = 107.26(1) ", and Z = 4 and with a = 10.766(7) A, b = 10.186(3) A, c = 11.625(4) A, /? = 1199(3)", and Z = 2。咪唑啉和噻吩环在 2,5NT 中只有 6 和 10",在 4,4'NB 中只有 21"。2,2'-二噻吩基发色团呈现平面反构象。一个二聚体结构,一个分子中有氧原子,另一个分子中有最近的氮原子,距离为 3.9 A,在 2,5NT 中沿