Structural characterization, optical properties and photocatalytic activity of MOF-5 and its hydrolysis products: implications on their excitation mechanism

RSC Advances ◽  
2015 ◽  
Vol 5 (89) ◽  
pp. 73112-73118 ◽  
Author(s):  
N. A. Rodríguez ◽  
R. Parra ◽  
M. A. Grela
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Structural Characterization ◽  
Excitation Mechanism ◽  
Hydrolysis Products ◽  
Ligand Charge Transfer ◽  
Photochemical Properties ◽  
Hydrolysis Of

Hydrolysis of MOF-5 gives place to a mixture of two compounds: MOF-5W and zinc terephthalate dihydrate. The analysis of optical and photochemical properties allows to infer the preeminence of a ligand to ligand charge-transfer.

Synthesis and Photochemical Properties of Re(I) Tricarbonyl Complexes Bound to Thione and Thiazole-2-ylidene Ligands

2020 ◽  
Author(s):  
Matthew Stout ◽  
Brian Skelton ◽  
Alexandre N. Sobolev ◽  
Paolo Raiteri ◽  
Massimiliano Massi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Bidentate Ligand ◽  
The Other ◽  
Ligand Exchange Reaction ◽  
Multiple Products ◽  
Ligand Charge Transfer ◽  
Photochemical Properties

<p>Three Re(I) tricarbonyl complexes, with general formulation Re(N^L)(CO)<sub>3</sub>X (where N^L is a bidentate ligand containing a pyridine functionalized in the position 2 with a thione or a thiazol-2-ylidene group and X is either chloro or bromo) were synthesized and their reactivity explored in terms of solvent-dependent ligand substitution, both in the ground and excited states. When dissolved in acetonitrile, the complexes bound to the thione ligand underwent ligand exchange with the solvent resulting in the formation of Re(NCMe)<sub>2</sub>(CO)<sub>3</sub>X. The exchange was found to be reversible, and the starting complex was reformed upon removal of the solvent. On the other hand, the complexes appeared inert in dichloromethane or acetone. Conversely, the complex bound to the thiazole-2-ylidene ligand did not display any ligand exchange reaction in the dark, but underwent photoactivated ligand substitution when excited to its lowest metal-to-ligand charge transfer manifold. Photolysis of this complex in acetonitrile generated multiple products, including Re(I) tricarbonyl and dicarbonyl solvato-complexes as well as free thiazole-2-ylidene ligand.</p>

scholarly journals Synthesis and Photochemical Properties of Re(I) Tricarbonyl Complexes Bound to Thione and Thiazole-2-ylidene Ligands

2020 ◽  
Author(s):  
Matthew Stout ◽  
Brian Skelton ◽  
Alexandre N. Sobolev ◽  
Paolo Raiteri ◽  
Massimiliano Massi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ligand Exchange ◽  
Ligand Substitution ◽  
Bidentate Ligand ◽  
The Other ◽  
Ligand Exchange Reaction ◽  
Multiple Products ◽  
Ligand Charge Transfer ◽  
Photochemical Properties

<p>Three Re(I) tricarbonyl complexes, with general formulation Re(N^L)(CO)<sub>3</sub>X (where N^L is a bidentate ligand containing a pyridine functionalized in the position 2 with a thione or a thiazol-2-ylidene group and X is either chloro or bromo) were synthesized and their reactivity explored in terms of solvent-dependent ligand substitution, both in the ground and excited states. When dissolved in acetonitrile, the complexes bound to the thione ligand underwent ligand exchange with the solvent resulting in the formation of Re(NCMe)<sub>2</sub>(CO)<sub>3</sub>X. The exchange was found to be reversible, and the starting complex was reformed upon removal of the solvent. On the other hand, the complexes appeared inert in dichloromethane or acetone. Conversely, the complex bound to the thiazole-2-ylidene ligand did not display any ligand exchange reaction in the dark, but underwent photoactivated ligand substitution when excited to its lowest metal-to-ligand charge transfer manifold. Photolysis of this complex in acetonitrile generated multiple products, including Re(I) tricarbonyl and dicarbonyl solvato-complexes as well as free thiazole-2-ylidene ligand.</p>

Metal-to-Ligand Charge Transfer Excited States in π-Conjugated Systems

2001 ◽  
Vol 665 ◽  
Author(s):  
Yiting Li ◽  
C. Ed Whittle ◽  
Keith A. Walters ◽  
Kevin D. Ley ◽  
Kirk S. Schanze
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Excited States ◽  
Transition Metal Complexes ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Transient Absorption Spectroscopy ◽  
Conjugated Oligomers ◽  
Conjugated Systems ◽  
Ligand Charge Transfer

ABSTRACTThis paper overviews recent work that examined the optical properties of mono-disperse, PPE-based π-conjugated oligomers that contain a 2,2-bipyridine-5,5'-diyl metal coordinating unit. The photophysical properties of the free oligomers and metallated oligomers that contain the -Ru(bpy)22+ and -Re(CO)3Cl transition metal complexes coordinated to the bpy-diyl unit have been characterized by absorption, photoluminescence and transient absorption spectroscopy. In addition, we report the photophysics of a novel organometallic “square” that features “sides” consisting of a PPE-type π-conjugated oligomer and “corners” that consist of (dbubpy)PtII(acetylide)2 units (where dbubpy = 4,4'-di-tert-butyl-2,2'-bipyridine).

Synthesis of transition-metal-containing poly(pyrazabole)s

2006 ◽  
Vol 78 (7) ◽  
pp. 1407-1411 ◽  
Author(s):  
Fukashi Matsumoto ◽  
Yoshiki Chujo
Keyword(s):  
Optical Properties ◽  
Charge Transfer ◽  
Transition Metal ◽  
Transition Metals ◽  
Emission Spectrum ◽  
Main Chain ◽  
Vibronic Structure ◽  
Ligand Charge Transfer ◽  
Coupling Polymerization

Novel organoboron polymers containing transition metals (Ni, Pd, Pt) and pyrazaboles in the main chain were prepared by Cu-catalyzed coupling polymerization. The Ni- and Pt-containing polymers showed MLCT (metal-to-ligand charge transfer) absorption, whereas the Pd-containing polymer did not demonstrate the absorption. Only the Pd-containing polymer exhibited the emission spectrum with a vibronic structure. These differences in the optical properties were studied in detail.

Chemical Synthesis, Structural Characterization, Optical Properties, and Photocatalytic Activity of Ultrathin ZnSe Nanorods

2011 ◽  
Vol 17 (31) ◽  
pp. 8663-8670 ◽  
Author(s):  
Tingting Yao ◽  
Qing Zhao ◽  
Zhengping Qiao ◽  
Feng Peng ◽  
Hongjuan Wang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
Chemical Synthesis ◽  
Structural Characterization
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