Previously, hydridotris(pyrazoly)borate (Tp) Ru(II) alkyl and aryl complexes of the type TpRu(L)(NCMe)-R (R = methyl or aryl; L = charge-neutral two-electron donating ligand) were demonstrated to activate aromatic C-H bonds. To determine the impact of replacing the anionic Tp ligand with charge-neutral poly(pyrazolyl) alkane ligands, [(C(pz)(4))Ru(P(OCH2)(3)CEt)(NCMe)Me][BAr'(4)] (pz = pyrazolyl, BAr'(4) = tetrakis[3,5-bis(trifluoromethyl)phenyl]borate) was prepared. Heating a C6D6 solution of [(C(pz)(4))Ru(P-(OCH2)(3)CEt)(NCMe)Me][BAr'(4)] with 1 equiv of NCMe resulted in C-H activation of the 5-position of a pyrazolyl ring to yield [(kappa(3)-(N,C-5,N)C(pz)(4))Ru(P(OCH2)(3)CEt)(NCMe)(2)][BAr'(4)] and CH4. Intramolecular C-H activation of the 5-position of a pyrazolyl ring also occurred when (eta(6)-p-cymene)Ru(P(OCH(2))3CEt)(Br)Ph was heated in the presence of C(pz)(4) to yield [(kappa(3)-N,C-5,N)C(pz)(4))]Ru(P(OCH2)(3)CEt)(NCMe)Br and C6H6. Density functional theory calculations revealed that the different reactivities of TpRu(P(OCH2)(3)CEO(NCMe)R and [(C(pz)(4))Ru(P(OCH2)(3)CEt)(NCMe)Me][BAr'(4)] result from the stronger binding of the Tp pyrazolyl rings to Ru(II) compared to that of C(pz)(4).
Cyclometallation of polydentate ligands containing pyrazole groups, including the synthesis of platinum(IV) complexes with tripodal [NCN]- ligand systems
作者:Allan J. Canty、R.Thomas Honeyman
DOI:10.1016/0022-328x(90)80028-x
日期:1990.5
cyclometallation at a C(5) position of one pyrazol-1-yl ring. The cyclometallated ligands have been examined as 'isoelectronic' analogues of nitrogen donor poly(pyrazol-1-yl)alkane and poly(pyrazol-1-yl)borate ligands. A carbon monoxide derivative, PtMe(pz)2(C3H2N2)CH-N,C(CO) (1d) and a series of phosphine complexes have been prepared. The complex PtMe(pz)2(C3H2N2)CH-N,C(py) (1a) and polymeric [PtMe(pz)2(C3H2N2)CH]n
Dimethylplatinum(II)络合物,PTR 2(L),已经进行了通过[PTR反应2(μ-SET 2)] 2与一系列含有一种或多种吡唑-1-基多齿氮供体配体(PZ)供体的基团,包括新的配体双(吡唑-1-基)(噻吩-2-基)甲烷。当在室温下溶于吡啶时,该配合物会产生顺式-PtMe 2(py)2,除了PtMe 2(L)(L =(pz)2 CH 2,(pz)2 C(H)Ph,(pz)3 CH或(pz)2(mim)CH(mim = N-甲基咪唑-2-基)),在一个吡唑-1-基环的C(5)位置进行环金属化。已将环金属化的配体作为氮供体聚(吡唑-1-基)烷和聚(吡唑-1-基)硼酸酯配体的“等电子”类似物进行了研究。制备了一氧化碳衍生物PtMe(pz)2(C 3 H 2 N 2)CH- N,C(CO)(1d)和一系列膦配合物。络合物PtMe(pz)2(C 3 H 2 N 2)CH- N,C(p
Synthesis and spectroscopic characterisation of binuclear molybdenum-rhenium complexes
作者:Michael G.B. Drew、Vitor Félix、Isabel S. Gonçalves、Fritz E. Kühn、AndréD. Lopes、Carlos C. Romão
DOI:10.1016/s0277-5387(97)00495-6
日期:1998.1
Abstract Protonation of CpMo(η3-C3H5)(CO)2 followed by reactions with several diazole ligands produce the molybdenum half-sandwich complexes [CpMo(CO)2L2]+ (L2 = Bisimidazole (H2Biim), pyrazole (Hpz)2, Cpz4, and [Bpz4]−) in good yields. Deprotonation of [CpMo(CO)2(H2Biim)]+ gives the anionic complex [CpMo(CO)2(Biim)]−. The structure of [CpMo(CO)2(H2Biim)][ReO4] was determined by X-ray single crystal