N-Heterocyclic Phosphenium Ligands as Sterically and Electronically-Tunable Isolobal Analogues of Nitrosyls
作者:Baofei Pan、Zhequan Xu、Mark W. Bezpalko、Bruce M. Foxman、Christine M. Thomas
DOI:10.1021/ic202581v
日期:2012.4.2
chemistry of an N-heterocyclicphosphenium (NHP)-containing bis(phosphine) pincer ligand has been explored with Pt0 and Pd0 precursors. Unlike previous compounds featuring monodentate NHP ligands, the resulting NHP Pt and Pd complexes feature pyramidal geometries about the central phosphorus atom, indicative of a stereochemically active lone pair. Structural, spectroscopic, and computational data suggest
Multimetallic Complexes Featuring a Bridging <i>N</i>-heterocyclic Phosphido/Phosphenium Ligand: Synthesis, Structure, and Theoretical Investigation
作者:Baofei Pan、Deirdra A. Evers-McGregor、Mark W. Bezpalko、Bruce M. Foxman、Christine M. Thomas
DOI:10.1021/ic4012873
日期:2013.8.19
By incorporating an N-heterocyclic phosphenium/phosphide (NHP) ligand into a chelating pincer ligand framework (PPP+/PPP–), we have elucidated several different and unprecedented binding modes of NHP ligands in homobimetallic, heterobimetallic, and trimetallic metal complexes. One-electron reduction of the previously reported (PPP)−/MII complexes (PPP)M-Cl (M = Pd (1), Pt (2)) results in clean formation
通过将一种N-杂环phosphenium /磷化物(NHP)配体成螯合配体钳形框架(PPP + / PPP - ),我们已阐明NHP的几个不同的,前所未有的结合模式的配体在homobimetallic,异核,和三金属的金属络合物。先前报道的(PPP)- / M II配合物(PPP)M-Cl(M = Pd(1),Pt(2))的单电子还原导致对称均双金属M I / M I配合物的干净形成[ (μ-PPP)Pd] 2(5)和[(μ-PPP)Pt] 2(6)。三齿NHP配体也已被用作通过盐合成的M / Co异双金属化合物(OC)3 Co(u-PPP)M(CO)(M = Pd(7),Pt(8))中的桥联接头从1和2与Na [Co(CO)4 ]的混合物中消除。此外,可以通过仔细调整反应化学计量,以类似于前体1(Pd(PPh 3)4 +(PPP)Cl)的方式合成NHP桥联的三金属配合物(PPP)2 Pd
Addition of H
<sub>2</sub>
Across a Cobalt–Phosphorus Bond
作者:Andrew M. Poitras、Sadie E. Knight、Mark W. Bezpalko、Bruce M. Foxman、Christine M. Thomas
DOI:10.1002/anie.201710100
日期:2018.2.5
Addition of H2 across the cobalt–phosphorusbond of (PPP)CoPMe3 (3) is demonstrated, where PPP is a monoanionic diphosphine pincer ligand with a central N‐heterocyclic phosphido (NHP−) donor. The chlorophosphine CoII complex (PPClP)CoCl2 (2) can be generated through coordination of the chlorophosphine ligand (PPClP, 1) to CoCl2. Subsequent reduction of 2 with KC8 in the presence of PMe3 generates (PPP)CoPMe3
Coordination of an N-Heterocyclic Phosphenium Containing Pincer Ligand to a Co(CO)<sub>2</sub> Fragment Allows Oxidation To Form an Unusual N-Heterocyclic Phosphinito Species
作者:Baofei Pan、Mark W. Bezpalko、Bruce M. Foxman、Christine M. Thomas
DOI:10.1021/om200816p
日期:2011.11.14
A tridentate pincerligand featuring a central N-heterocyclic phosphenium (NHP+) donor has been coordinated to a Co(CO)2 fragment to generate the Co NHP complex [PPP]Co(CO)2 (2). The NHP unit adopts an unusual pyramidal geometry with a relatively long Co–P distance, suggesting a stereochemically active nonbonding phosphorus lone pair. Interestingly, treatment of 2 with trimethylamine N-oxide affords
N-heterocyclic phosphenium and phosphido nickel complexes supported by a pincer ligand framework
作者:Deirdra A. Evers-McGregor、Mark W. Bezpalko、Bruce M. Foxman、Christine M. Thomas
DOI:10.1039/c5dt03549j
日期:——
A chelating diphosphine ligand with a central N-heterocyclicphospheniumcation (NHP+) has been used to explore the coordination chemistry of NHPs with nickel. Treatment of the chlorophosphine precursor [PPP]Cl (1) with stoichiometric Ni(COD)2 affords (PPP)NiCl (8), which is best described as a NiII/NHP− phosphido complex formed via oxidative addition of the P–Cl bond. In contrast, treating [PPP]Cl