Exploring Different Equatorial Donors in a Series of Five-Coordinate Cu(II) Complexes Supported by Rigid Tetradentate Ligands

Photoredox reactions occurring in irradiated methanolic solutions of trans-[FeIII(R,R'-salen)(CH3OH)I], where R,R'-salen2- are N,N'-ethylenebis(R,R'-salicylideneiminato), tetradentate open-chain N2O2-Schiff bases with R,R' = H, 5-Cl, 5-Br, 3,5-di-Br, 3,5-di-(CH3), 3-OCH3, 5-OCH3, have been investigated and their mechanism proposed. The complexes are redox-stable in the dark. Ultraviolet and/or visible irradiation of methanolic solution of the complexes induces photoreduction of Fe(III) to Fe(II). Depending on the composition of the irradiated solutions, •CH2OH radicals or solvated electrons were identified by the EPR spin trapping technique. The final product of the photooxidation coupled with the photoreduction of Fe(III) is formaldehyde and the molar ratio of Fe(II) and CH2O is close to 2 : 1. The efficiency of the photoredox process is strongly wavelength-dependent and influenced by the peripheral groups R,R' of the tetradentate ligands.

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ChemInform Abstract: OXYGENATION STUDIES OF MANGANESE(II) COMPLEXES EMPLOYING TETRADENTATE LIGANDS DERIVED FROM SALICYLALDEHYDE AND LONG CHAIN DIAMINES

Chemischer Informationsdienst ◽

10.1002/chin.197915321 ◽

1979 ◽

Vol 10 (15) ◽

Author(s):

S. J. E. TITUS ◽

W. M. BARR ◽

L. T. TAYLOR

Keyword(s):

Tetradentate Ligands ◽

Long Chain

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Functionalized tetradentate ligands for Ru-sensitized solar cells

Tetrahedron ◽

10.1016/s0040-4020(01)00801-8 ◽

2001 ◽

Vol 57 (38) ◽

pp. 8145-8150 ◽

Cited By ~ 13

Author(s):

Thierry Renouard ◽

Michael Grätzel

Keyword(s):

Solar Cells ◽

Tetradentate Ligands ◽

Sensitized Solar Cells

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Syntheses, Characterization, and Properties of Vanadium(III) Complexes Containing Tripodal Tetradentate Ligands with Single Pyridyl Groups

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.68.2581 ◽

1995 ◽

Vol 68 (9) ◽

pp. 2581-2589 ◽

Cited By ~ 15

Author(s):

Kan Kanamori ◽

Eiji Kameda ◽

Takatsugu Kabetani ◽

Taiko Suemoto ◽

Ken-ichi Okamoto ◽

...

Keyword(s):

Tetradentate Ligands

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Synthesis and characterization of cis -dioxomolybdenum(VI) complexes with sterically bulky tripodal tetradentate ligands

Inorganica Chimica Acta ◽

10.1016/s0020-1693(00)80970-6 ◽

1988 ◽

Vol 144 (1) ◽

pp. 81-87 ◽

Cited By ~ 2

Author(s):

Christopher J. Cook ◽

Joseph Topich

Keyword(s):

Synthesis And Characterization ◽

Tetradentate Ligands

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Nickel(II) and Iron(II) Complexes with Tetradentate NHC/Amide Hybrid Ligands

Zeitschrift für Naturforschung B ◽

10.5560/znb.2013-3091 ◽

2013 ◽

Vol 68 (5-6) ◽

pp. 458-466 ◽

Cited By ~ 7

Author(s):

Iris Klawitter ◽

Steffen Meyer ◽

Serhiy Demeshko ◽

Franc Meyer

Keyword(s):

Cyclic Voltammetry ◽

Redox Properties ◽

Spin States ◽

Imidazolium Salts ◽

Tetradentate Ligands ◽

Square Planar ◽

Hybrid Ligands

Two methylene-bridged bis(imidazolium) salts [H4L1](PF6)2 and [H4L2](PF6)2 with appended amide groups have been synthesized which, after deprotonation, may serve as potentially tetradentate ligands providing two bis(imidazole-2-ylidene) and two amide donors. Using [H4L1](PF6)2, a square-planar nickel(II) complex [NiL1] and a six-coordinate bis(ligand) iron(II) complex [Fe(HL1)2] have been isolated and structurally characterized. Their low-spin states have been confirmed spectroscopically, and their redox properties have been studied by cyclic voltammetry. Oxidations are metal-centered to give NiIII and FeIII species, respectively

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