The photolysis of HN3 vapor in the presence of C3H8 was studied at 313 nm and 30°C. The main products were N2, H2, CH4, C2H6, C3H6, NH4N3, CH3NH2·HN3, C2H5NH2·HN3, and n- and i-C3H7NH2·HN3. The quantum yields of these products were measured as a function of the pressure of HN3 or C3H8. The following mechanisms for the main reactions was proposed: HN3+hν(313 nm)→N2+NH(a1Δ); NH(a1Δ)+HN3→2N2+2H, NH2+N3, and N2+N2H2* (2); NH(a1Δ)+C3H8→C3H7NH2*(n- and i-propylamine) (3); NH(a1Δ)+C3H8→NH (X3Σ−)+C3H8 (4); C3H7NH2*→CH3+C2H4NH2 (5); CH4+C2H4NH (6), C2H4+CH3NH2 (7), C2H5+CH2NH2 (8), C2H6+CH2NH (9), H2+C3H6NH (10), and NH3+C3H6 (11); C3H7NH2*+HN3→C3H7NH2+HN3 (12); C3H7NH2*+ C3H8→C3H7NH2+C3H8 (13). The rate constant ratios are: k3⁄k2=1.28; k4⁄k2=0.262; k6⁄k5=0.109; k7⁄k5=0.050; k8⁄k5=1.39; k9⁄k5=0.040; k10⁄k5=1.20; k11⁄k5=4.72; k12⁄k5=666 dm3 mol−1; k13⁄k5=860 dm3 mol−1. The formation ratio of n-C3H7NH2/i-C3H7NH2 was 1.55, regardless of the total pressure. The half-life of 1.78×10−10 s for C3H7NH2* was obtained by using the collision theory. The relative and absolute rate constants were compared for the reactions of NH(a1Δ) with CH4, C2H6, and C3H8; it was found that the relative yield for the insertion of NH(a1Δ) into a C–H bond increases with a decrease in the C–H bond dissociation energy.
在30°C和313 nm下研究了
HN3蒸气在
C3H8存在下的光解过程。主要产物为N2、H2、
CH4、
C2H6、
C3H6、NH4N3、 NH2· 、 NH2· 以及n-和i-C3H7NH2· 。测量了这些产物的量子产率与 或 的压力的关系。提出了主要反应的以下机制: +hν(313 nm)→N2+NH(a1Δ);NH(a1Δ)+ →2N2+2H,NH2+N3,以及N2+N2H2* (2);NH(a1Δ)+ →C3H7NH2*(n-和i-
丙胺) (3);NH(a1Δ)+ →NH (X3Σ−)+ (4);C3H7NH2*→
CH3+ NH2 (5); + NH (6),
C2H4+ NH2 (7),
C2H5+CH2NH2 (8), +CH2NH (9),H2+ NH (10),以及NH3+ (11);C3H7NH2*+ →C3H7NH2+ (12);C3H7NH2*+ →C3H7NH2+ (13)。反应的速率常数比为:k3⁄k2=1.28;k4⁄k2=0.262;k6⁄k5=0.109;k7⁄k5=0.050;k8⁄k5=1.39;k9⁄k5=0.040;k10⁄k5=1.20;k11⁄k5=4.72;k12⁄k5=666 dm3 mol−1;k13⁄k5=860 dm3 mol−1。n-C3H7NH2/i-C3H7NH2的形成比为1.55,无论总压力如何。通过使用碰撞理论得到C3H7NH2*的半衰期为1.78×10−10 s。比较了NH(a1Δ)与 、 和 反应的相对和绝对速率常数;发现NH(a1Δ)插入C–H键的相对产率随着C–H键离解能的降低而增加。