Increasing the Ligand Field Strength in Butadiene Open Sandwich Compounds from the First to the Second Row Transition Metals

2020 ◽  
Vol 5 (21) ◽  
pp. 6350-6359
Author(s):  
Junfeng Qian ◽  
Qun Chen ◽  
Mingyang He ◽  
Zhihui Zhang ◽  
Xuejun Feng ◽  
...  
Keyword(s):  
Transition Metals ◽  
Field Strength ◽  
Ligand Field ◽  
Sandwich Compounds

scholarly journals Synthesis, Characterization and Photophysical Properties of a New 2,5-Di(aryl)phosphole Derivative and Their Trigonal Copper-Phosphole Complexes

2020 ◽  
Author(s):  
Neskarlys Rios ◽  
Franmerly Fuentes ◽  
Juan Manuel Garcia Garfido ◽  
Yomaira Otero
Keyword(s):  
Field Strength ◽  
Fluorescence Spectroscopy ◽  
Photophysical Properties ◽  
High Yield ◽  
Quantum Yields ◽  
Ligand Field ◽  
Emission Energy ◽  
Esi Ms

<div>A new phosphole derivative 2,5-di(2-quinolyl)-1-phenylphosphole (<b>1</b>) was synthesized by using the Fagan-Nugent method. Phosphole was obtained as an air stable solid in high yield (73%). Additionally, two new copper phosphole complexes [CuX(Phosphole)<sub>2</sub>] (X = Cl (<b>2a</b>), I (<b>2b</b>), Phosphole = <b>1</b>) have been synthesized by reaction of CuX (X = Cl, I) and phosphole derivative (<b>1</b>). All compound were characterized by NMR, ESI-MS, UV–Vis and fluorescence spectroscopy. The photophysical properties of all compounds were analyzed, UV-Vis spectra of the complexes <b>2a-b</b> shown π–π* transitions with shift very similar to the found in the free phosphole due to that their symmetrical structures inhibits efficient ILCT. We have found that the compounds <b>1</b>, <b>2a-b</b> exhibited fluorescence between 460 and 583 nm with quantum yields of Φ<sub>f</sub> = 0.04 – 0.11. The emission energy of <b>2b</b> is higher than <b>2a</b>, suggesting that λ<sub>max</sub> is affected by the ligand-field strength of the halogen ions in the complexes (I<sup>-</sup> < Cl<sup>-</sup> ).</div>

scholarly journals Synthesis, Characterization and Photophysical Properties of a New 2,5-Di(aryl)phosphole Derivative and Their Trigonal Copper-Phosphole Complexes

2020 ◽  
Author(s):  
Neskarlys Rios ◽  
Franmerly Fuentes ◽  
Juan Manuel Garcia Garfido ◽  
Yomaira Otero
Keyword(s):  
Field Strength ◽  
Fluorescence Spectroscopy ◽  
Photophysical Properties ◽  
High Yield ◽  
Quantum Yields ◽  
Ligand Field ◽  
Emission Energy ◽  
Esi Ms

<div>A new phosphole derivative 2,5-di(2-quinolyl)-1-phenylphosphole (<b>1</b>) was synthesized by using the Fagan-Nugent method. Phosphole was obtained as an air stable solid in high yield (73%). Additionally, two new copper phosphole complexes [CuX(Phosphole)<sub>2</sub>] (X = Cl (<b>2a</b>), I (<b>2b</b>), Phosphole = <b>1</b>) have been synthesized by reaction of CuX (X = Cl, I) and phosphole derivative (<b>1</b>). All compound were characterized by NMR, ESI-MS, UV–Vis and fluorescence spectroscopy. The photophysical properties of all compounds were analyzed, UV-Vis spectra of the complexes <b>2a-b</b> shown π–π* transitions with shift very similar to the found in the free phosphole due to that their symmetrical structures inhibits efficient ILCT. We have found that the compounds <b>1</b>, <b>2a-b</b> exhibited fluorescence between 460 and 583 nm with quantum yields of Φ<sub>f</sub> = 0.04 – 0.11. The emission energy of <b>2b</b> is higher than <b>2a</b>, suggesting that λ<sub>max</sub> is affected by the ligand-field strength of the halogen ions in the complexes (I<sup>-</sup> < Cl<sup>-</sup> ).</div>

Control of Ligand Field Strength through Intra- and Interligand Contact. Octahedral Iron(II) Poly(pyrazolyl)borate Complexes

1995 ◽  
Vol 34 (15) ◽  
pp. 3928-3934 ◽  
Author(s):  
Yoshiki Sohrin ◽  
Hisao Kokusen ◽  
Masakazu Matsui
Keyword(s):  
Field Strength ◽  
Ligand Field ◽  
Borate Complexes

Ligand-Field Strength and Symmetry-Restricted Covalency in CuIIComplexes - a Near-Edge X-ray Absorption Fine Structure Spectroscopy and Time-Dependent DFT Study

2015 ◽  
Vol 2015 (16) ◽  
pp. 2707-2713 ◽  
Author(s):  
Giulia Mangione ◽  
Luciano Pandolfo ◽  
Mauro Sambi ◽  
Giovanni Ligorio ◽  
Marco Vittorio Nardi ◽  
...  
Keyword(s):  
Fine Structure ◽  
Field Strength ◽  
Time Dependent ◽  
Dft Study ◽  
Ligand Field ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

Designing air-stable cyclometalated Fe(ii) complexes: stabilization via electrostatic effects

2019 ◽  
Vol 48 (2) ◽  
pp. 374-378 ◽  
Author(s):  
Daniel Charles Ashley ◽  
Sriparna Mukherjee ◽  
Elena Jakubikova
Keyword(s):  
Field Strength ◽  
Iron Complexes ◽  
Ligand Field ◽  
Electrostatic Effects

Substitution of EWGs onto the cyclometelated iron complexes electrostatically stabilizes the Fe(ii) center while still preserving the increased ligand field strength.

scholarly journals Tuning ligand field strength with pendent Lewis acids: access to high spin iron hydrides

2019 ◽  
Vol 10 (21) ◽  
pp. 5539-5545 ◽  
Author(s):  
John J. Kiernicki ◽  
James P. Shanahan ◽  
Matthias Zeller ◽  
Nathaniel K. Szymczak
Keyword(s):  
Field Strength ◽  
High Spin ◽  
Lewis Acids ◽  
Ligand Field ◽  
Acid Base ◽  
Biologically Relevant ◽  
High Spin Iron

Pendent borane Lewis acids provide an avenue for changing a ligand's field strength through acid/base interactions; this strategy was highlighted within a series of biologically-relevant high spin iron hydrides.

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