Influence of a Pendant Amine in the Second Coordination Sphere on Proton Transfer at a Dissymmetrically Disubstituted Diiron System Related to the [2Fe]H Subsite of [FeFe]H2ase

被引:146
作者
Ezzaher, Salah [1 ,2 ]
Capon, Jean-Francois [1 ,2 ]
Gloaguen, Frederic [1 ,2 ]
Petillon, Francois Y. [1 ,2 ]
Schollhammer, Philippe [1 ,2 ]
Talarmin, Jean [1 ,2 ]
Kervarec, Nelly [1 ,2 ,3 ]
机构
[1] Univ Europeenne Bretagne, F-35000 Rennes, France
[2] Univ Brest, CNRS, UMR Chim Electrochim Mol & Chim Analyt 6521, ISSTB,CS 93837, F-29238 Brest 3, France
[3] Univ Bretagne Occidentale, Serv RMN, UFR Sci & Tech, CS 93837, F-29238 Brest 3, France
关键词
IRON-ONLY HYDROGENASE; ACTIVE-SITE; TERMINAL HYDRIDE; COMPLEXES; MODELS; RELEVANT; LIGAND; BASES;
D O I
10.1021/ic801369u
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Studies of the protonation of [Fe-2(CO)(4)(kappa(2)-PNP)(mu-pdt)] (1; PNP = (Ph2PCH2)(2)NCH3) by HBF4 center dot Et2O showed that the nature of the reaction product depends on whether the reaction is conducted in acetone or in dichloromethane. In acetone, an N-protonated form, 2, is isolated. Tautomerization of 2 in CH2Cl2 gives rise to a mu-hydride species 3. Variable-temperature NMR experiments have been performed to clarify the processes involved.
引用
收藏
页码:2 / 4
页数:3
相关论文
共 23 条
[1]   Models of the iron-only hydrogenase:: Synthesis and protonation of bridge and chelate complexes [Fe2(CO)4{Ph2P(CH2)nPPh2}(μ-pdt)] (n=2-4) -: evidence for a terminal hydride intermediate [J].
Adam, Fatima I. ;
Hogarth, Graeme ;
Kabir, Shariff E. ;
Richards, Dris .
COMPTES RENDUS CHIMIE, 2008, 11 (08) :890-905
[2]   Models of the iron-only hydrogenase:: Structural studies of chelating diphosphine complexes [Fe2(CO)4(μ-pdt)(κ2P,P′-diphosphine)] [J].
Adam, Fatima I. ;
Hogarth, Graeme ;
Richards, Idris ;
Sanchez, Benjamin E. .
DALTON TRANSACTIONS, 2007, (24) :2495-2498
[3]   Terminal hydride in [FeFe]-hydrogenase model has lower potential for H2 production than the isomeric bridging hydride [J].
Barton, Bryan E. ;
Rauchfuss, Thomas B. .
INORGANIC CHEMISTRY, 2008, 47 (07) :2261-2263
[4]   [Ni(Et2PCH2NMeCH2PEt2)2]2+ as a functional model for hydrogenases [J].
Curtis, CJ ;
Miedaner, A ;
Ciancanelli, R ;
Ellis, WW ;
Noll, BC ;
DuBois, MR ;
DuBois, DL .
INORGANIC CHEMISTRY, 2003, 42 (01) :216-227
[5]   Di-iron aza diphosphido complexes:: Mimics for the active site of Fe-only hydrogenase, and effects of changing the coordinating atoms of the bridging ligand in [Fe2{μ-(ECH2)2NR}(CO)6] [J].
Das, P ;
Capon, JF ;
Gloaguen, F ;
Pétillon, FY ;
Schollhammer, P ;
Talarmin, J ;
Muir, KW .
INORGANIC CHEMISTRY, 2004, 43 (26) :8203-8205
[6]   The role of pendant bases in molecular catalysts for H2 oxidation and production [J].
DuBois, Mary Rakowski ;
DuBois, Daniel L. .
COMPTES RENDUS CHIMIE, 2008, 11 (08) :805-817
[7]  
EZZAHER S, UNPUB
[8]   Diiron chelate complexes relevant to the active site of the iron-only hydrogenase [J].
Ezzaher, Salah ;
Capon, Jean-Francois ;
Gloaguen, Frederic ;
Kervarec, Nelly ;
Petillon, Francois Y. ;
Pichon, Roger ;
Schollhammer, Philippe ;
Talarmin, Jean .
COMPTES RENDUS CHIMIE, 2008, 11 (08) :906-914
[9]   First insights into the protonation of dissymetrically disubstituted di-iron azadithiolate models of the [FeFe]H2 ases active site [J].
Ezzaher, Salah ;
Orain, Pierre-Yves ;
Capon, Jean-Francois ;
Gloaguen, Frederic ;
Petillon, Francois Y. ;
Roisnel, Thierry ;
Schollhammer, Philippe ;
Talarmin, Jean .
CHEMICAL COMMUNICATIONS, 2008, (22) :2547-2549
[10]   Electron-transfer-catalyzed rearrangement of unsymmetrically substituted diiron dithiolate complexes related to-the active site of the [FeFe]-Hydrogenases [J].
Ezzaher, Salah ;
Capon, Jean-Francois ;
Gloaguen, Frederic ;
Petillon, Francois Y. ;
Schollhammer, Philippe ;
Talarmin, Jean .
INORGANIC CHEMISTRY, 2007, 46 (23) :9863-9872