Neutral Tridentate Ligands

Neutral tridentate [N3] supporting ligands, chromium complexes, 5, 359... 

Continuing with the furanoses, in 161 [133] 2,3-0-isopropylidene-Q -L-sorbofuranose acts as a neutral tridentate ligand which is coordinated by three hydroxyl groups coor-... 

Neutral Ir complexes mentioned above are all composed of bidentate ligands. Believing tridentate ligands can lead to different excited state, stereoisomer, and... 

Figure 7.1 Examples for precatalysts based on neutral tridentate ligands." Activity as defined above molecular weight of PE (gmol )).

Although [2-f2] cycloaddition reactions such as (7.5.1.2) are rare, an iron complex with a neutral tridentate nitrogen ligand has been shown to catalyze it. Here, as shown by reaction 7.5.1.3, structure 7.67 is involved as an intermediate. 

Attention has increasingly focused on neutral ligands diat can complex to cuprate reagetits dirougli soft beteroatoms sudi as sulfur and phosphorous fSclieme 3.50) [218-219]. Leyetidecker s bydroxyproline-derived tridentate ligand IS repre-... 

In 1996, Cavell described the synthesis of neutral P(VI) compound 37 containing a divalent tridentate diphenol imine ligand and three chlorine atoms by the reaction of a bis silylated Schiff base with PCI5 to give 37 after elimination of two equivalents of Me3SiCl (Scheme 7) [51]. 

Complexes of 2-formylquinoline and 1-formylisoquinoline thiosemicarbazones, 20 and 21, respectively, have been prepared, but iron(III) complexes were not included in the initial study [147], More recently [132], an iron(III) complex of 1-formylisoquinoline thiosemicarbazone, [Fe(21)Cl3] has been found to have a magnetic moment of about 2.1, g of 2.146, and involve the neutral ligand bound in a tridentate manner. A complex of the same stoichiometry was reported for 4-methyl-5-amino-1-formylisoquinoline thiosemicarbazone, 22. Its magnetic moment is about 2.1 and g, = 2.126. 

Methyl-3-formylpyrazole A-phenylthiosemicarbazone, 45, coordinates as a deprotonated NNS tridentate ligand to form the diamagnetic, spin-paired [Ni(45-H)NCS] complex [200]. However, the complexes formed with other nickel(II) salts have stoichiometry [Ni(45)2]A2, where A = Cl, Br, NO3, CIO4, and BF4. These octahedral complexes NNS coordinated neutral hgands have Dq values between 1086 and 1150cm" ... 

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