A correlation study: 13C, 17O, 29Si and 31P NMR chemical shifts and approximate CO stretching force constants for cis-disubstituted molybdenum carbonyl complexes

摘要: Abstract The 13 C, 17 O, 29 Si and 31 P NMR spectral properties of cis -Mo(CO) 4 (PPh 2 X) , where X is Cl, OMe, 4-MeC 6 H NH NHMe, NHCH CH NMe NH, SEt, OSiMe 3 or NHSiMe )(PPh YPPh ), Y NMeCH NMe, NHSiMePhNH, OSiMePhO -[Mo(CO) O) ] have been determined. Good to excellent correlations between the C O chemical shifts carbonyl ligands trans phosphorus donor are found. Only poor seen for two phosphine substituted groups. Based on only seven samples, also correlate well. Correlations shift data with approximate CO stretching force constants fair good depending upon selection data. In particular, much better noted in almost all instances when complexes monodentate bidentate examined separately.