Ring Closure Kinetics of Bidentate Hemilabile P,N and P,S Ligands on a Platinum(II) Complex
作者:Raffaello Romeo、Luigi Monsu’ Scolaro、Maria Rosaria Plutino、Andrea Romeo、Francesco Nicolo’、Alessandro Del Zotto
DOI:10.1002/1099-0682(200203)2002:3<629::aid-ejic629>3.0.co;2-j
日期:2002.3
the cis-[PtPh2(CO)(η1-P−X)] complexes have been monitored in [D]chloroform by 1H and 31P1H} NMR. The rates of ring closure were found to be strongly dependent on the nature (S or N) and steric hindrance of the chelating end of the monocoordinated bidentate P−X ligand, and on the size of the ring formed. In contrast, ring size plays a negligible role, if any, in the dechelation reactions of cis-[PtPh2(S−S)]
cis-[PtPh2(CO)(η1-P-N)] 和 cis-[PtPh2(CO)(η1-P-S)] 类型的复合物,其中双齿磷-氮和磷-硫配体与单齿金属中心 [PN = Ph2PC5H4N (Ph2PPy), Ph2P(CH2)2C5H4N (ppye), Ph2P(o-C6H4)NMe2 (PNMe2), Ph2P(CH2)nNMe2 (n = 2, 3, 即, peNMe2 和 ppNMe2) 和 PS = Ph2P(CH2)2SEt (P-SEt), Ph2P(CH2)nSPh (n = 1, 2, 即 P-CH2SPh 和 P-SPh)],通过反应原位制备具有顺式-[PtPh2(CO)(SEt2)]的杂化配体的分析。在每种情况下,第一个观察到的过程是二乙基硫醚被磷酰基快速取代,导致单取代的开环顺式-[PtPh2(CO)(η1-PX)] (X = N 或 S) 复合物,通过 1H 和 31P1H}