(1a‐N2), has been synthesized. Triplet diphenylcarbene 31a is generated from the precursor and is characterized by UV–Vis spectroscopy at low temperature and laser flash photolysis (LFP) techniques at room temperature. Irradiation of 1a‐N2 in a 2‐methyltetrahydrofuran (2‐MTHF) matrix at 77 K gives the UV–Vis spectrum of 31a, but ESR signals that can be assigned to a triplet species are not detected. The
已合成邻位有两个
碘和两个
溴基的
二苯基重氮甲烷(2,6-二
溴-4-
叔丁基苯基)(2,6-二
碘-4-
叔丁基苯基)
重氮甲烷(1a- N 2) 。三重态二苯卡宾3 1a是由前体生成的,其特征在于在低温下具有UV-Vis光谱学,在室温下具有激光闪光光解(LFP)技术。在
2-甲基四氢呋喃(2-
MTHF)基质中以77 K辐照1a -N 2时得到3 1a的UV-Vis光谱,但未检测到可归属于三重态物质的ESR信号。1a- N的LFP2在脱气的苯溶液中在351 nm处产生归因于3 1a的瞬态吸收,该吸收在二阶过程中以0.17 s -1的速率常数衰减。3 1a的前半衰期估计为24 s。三重态卡宾3 1a被
氧气捕获以生成
二苯甲酮氧化物1a- O,在415 nm处具有最大吸收率,速率常数为7.3×10 6 M -1 s -1,还被
1,4-环己二烯(CHD)捕获以产生自由基二苯(1A -H 2,λ最大 = 380