Synthetic and Structural Studies on Linear and Macrocyclic Pd- and Pt-Bridged Butterfly Fe/S Cluster Complexes
作者:Li-Cheng Song、Long-Duo Zhang、Bei-Bei Liu、Shu-Da Ding、Hao Chen、Xiu-Fang Xu、Gui-Lan Fan
DOI:10.1021/acs.organomet.7b00117
日期:2017.4.10
Three types of (diphosphine)Pd- or Pt-bridged butterfly Fe/S cluster complexes have been prepared by a simple and convenient one-pot synthetic method. The first type of such complexes involves the linear (diphosphine)Pd- or Pt-bridged double-butterfly Fe/S clusters [(mu-RS)(mu-S=CS)Fe-2(CO)(6)](2)[M-(diphosphine)] (1-12; M = Pd and Pt; R = Et, t-Bu, Ph, and p-MeC6H4; diphosphine = dppe, dppv, and dppf), which were prepared by sequential reactions of monoanions [(mu-RS)(mu-CO)Fe-2(CO)(6)](-) (formed in situ from Fe-3(CO)(12), RSH, and Et3N) with excess CS2, followed by treatment of the resulting monoanions (mu-RS)(mu-S=CS)Fe-2(CO)(6)](-) with (diphosphine)MCl2. The second type of complexes involves the macrocyclic (diphosphine)M-bridged double-butterfly Fe/S clusters [mu-S(CH2)(4)S-mu][(mu-S=CS)Fe-2(CO)(6)](2)[M(diphosphine)] (13-16; M = Pd and Pt; diphosphine = dppe and dppv), which were prepared by sequential reactions of dianion [mu-S(CH2)(4)S-mu}(mu-CO)Fe-2(CO)(6)}(2)](2-) (generated in situ from Fe-3(CO)(12), dithiol HS(CH2)(4)SH, and Et3N) with excess CS2, followed by treatment of the resultant dianion [mu-S(CH2)(4)S-mu}(mu-S=CS)Fe-2(CO)(6)}(2)](2-) with (diphosphine)MCl2. In contrast, when dithiol HS(CH2)(4)SH was replaced by HS(CH2)(3)SH (a dithiol with a shorter carbon chain), the aforementioned sequential reactions afforded the third type of macrocyclic complexes which involves the (diphosphine)M-bridged quadruple-butterfly Fe/S clusters [mu-S(CH2)(3)S-mu}(mu-S=CS)Fe-2(CO)(6)}(2)](2)[M(diphosphine)](2) (17-20; M = Pd and Pt; diphosphine = dppe and dppv). While the two possible pathways are suggested for production of the two types of novel macrocyclic Fe/S clusters 13-20, respectively, all new complexes 1-20 have been characterized by elemental analysis, spectroscopy, and, for some of them particularly, DFT calculations and X-ray crystallography.