indicating that H2 evolution is catalyzed by [1a]0. DFT calculations were used to investigate the pathway for H2 evolution and revealed that the mechanism can proceed through two isomers of [1a]0 that differ in the stereochemistry of the Fe(dppe)CO center. Calculations suggest that protonation of [1a]0 (both isomers) affords NiIII–H–FeII intermediates, which represent mimics of the Ni-C state of the enzyme
描述了 [NiFe]-氢化酶活性位点的一类新的合成模型。 Ni I/II (SCys) 2和 Fe II (CN) 2 CO 位点用 (RC 5 H 4 )Ni I/II和 Fe II (diphos)(CO) 模块表示,其中 diphos = 1,2-C 2 H 4 (PPh 2 ) 2 (dppe)或顺式-1,2-C 2 H 2 (PPh 2 ) 2 (dppv)。两个桥连
硫醇盐配体由 CH 2 (CH 2 S) 2 2– (pdt 2– )、Me 2 C(CH 2 S) 2 2– (Me 2 pdt 2– ) 和 (C 6 H 5 S ) 2 2– . Fe(pdt)(CO) 2 (dppe) 和 [(C 5 H 5 ) 3 Ni 2 ]BF 4反应得到 [(C 5 H 5 )Ni(pdt)Fe(dppe)(CO)]BF 4 ([ 1a ]BF 4 )。单羰基 [ 1a ]BF 4具有S