Synthesis and aquation kinetics of some cis-dihalotetra-ammine chromium(III) complexes
作者:W.G Jackson、P.D Vowles、W.W Fee
DOI:10.1016/s0020-1693(00)91099-5
日期:1976.1
strict retention; X = Cl, k25 = 3.30 × 10−4 sec−1 ΔH≠ = 20.0 kcal mol−1, ΔS≠ = –5.9 cal mol-1 deg −1; X = Br, k25 = 3.80 × 10 −3, ΔH≠ = 19.2 kcal mol−1, ΔS≠ = 2–5.7 cal mol−1 deg−1. The retentive aquation of trans-Cr(NH3)4Br2+ is also reported; k25 = 9.8 × 10−4 sec−1, ΔH≠ = 19.3 kcal mol-1, ΔS≠ = −7.2 cal mol−1 deg−1. The spontaneous and Hg2+ promoted hydrolysis of several cis- and trans-CrN4AXn+ cations
通过顺式-[Cr(NH 3)4 F 2 ] ClO 4与干燥气态的反应,可以高收率合成以前未知的顺式-Cr(NH 3)4 X 2 +(X = Cl,Br)阳离子的盐。在2-甲氧基乙醇中的HX。两种阳离子均在稀酸(HCl或HNO 3,μ= 0.42)中严格保留;X =氯,K 25 = 3.30×10 -4秒-1 ΔH ≠ = 20.0千卡摩尔-1,ΔS ≠ = -5.9 CAL摩尔-1度-1 ; X = Br,k 25 = 3.80×10−3,ΔH ≠ = 19.2 kcal mol -1,ΔS ≠ = 2–5.7 cal mol -1 deg -1。还报道了反式Cr(NH 3)4 Br 2 +的保持性水合;k 25= 9.8×10 -4 sec -1,ΔH≠= 19.3kcal mol -1,ΔS≠= -7.2cal mol -1 deg -1。Hg 2+的自发促进了几个顺式和反式CrN 4