Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.
Science. 2013 Dec 13;342(6164):1354-7. doi: 10.1126/science.1244180.
Nitric oxide (NO) reacts with hydroxyl radicals (OH) in the gas phase to produce nitrous acid, HONO, but essentially nothing is known about the isomeric nitrosyl-O-hydroxide (HOON), owing to its perceived instability. We report the detection of gas-phase HOON in a supersonic molecular beam by Fourier transform microwave spectroscopy and a precise determination of its molecular structure by further spectroscopic analysis of its (2)H, (15)N, and (18)O isotopologs. HOON contains the longest O-O bond in any known molecule (1.9149 ± 0.0005 Å) and appears surprisingly stable, with an abundance roughly 3% that of HONO in our experiments.
一氧化氮（NO）在气相中与羟基自由基（OH）反应生成亚硝酸（HONO），但由于被认为不稳定，对于其异构物亚硝酰-O-羟基（HOON），几乎一无所知。我们通过傅里叶变换微波光谱法在超音速分子束中检测到气相 HOON，并通过对其（2）H、（15）N 和（18）O 同位素的进一步光谱分析，精确确定了其分子结构。HOON 含有任何已知分子中最长的 O-O 键（1.9149 ± 0.0005 Å），出人意料地稳定，在我们的实验中，其丰度约为 HONO 的 3%。
