New erbium complexes emitting in infrared region based on oligothiophene and thiophenefluorene carboxylate

Destri, Silvia; Pasini, Mariacecilia; Porzio, William; Rizzo, Fabio; Dellepiane, G.; Ottonelli, Massimo; Musso, G. F.; Meinardi, Francesco; Veltri, Lucia

doi:10.1016/j.jlumin.2007.03.018

Cited by 18 publications

(8 citation statements)

References 21 publications

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“…Modellization by using CIS/INDO methods [9] on three ligands and also on Na + , Zn 2+ complexes of the same molecules, with particular reference to absorption spectrum, indicate a different behaviour of the two bands, in agreement with experimental data; namely a significant shift towards lower energies of the first one, as a function of ligand conjugation, while the shift of the latter is progressively reduced by increasing the ion positive charge (see Fig. 5).…”

Section: Optical Characterizationssupporting

confidence: 75%

Sentitized near-infrared emission in novel neodymium complexes bearing oligothiophene derivatives as antennae

Rizzo

Destri

Porzio

et al. 2008

Materials Science and Engineering: B

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Section: Optical Characterizationssupporting

confidence: 75%

Sentitized near-infrared emission in novel neodymium complexes bearing oligothiophene derivatives as antennae

Rizzo

Destri

Porzio

et al. 2008

Materials Science and Engineering: B

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“…We use as representative systems Er 3+ complexes prepared with a new class of oligothiophene and thiophenefluorene ligands, {4′-(hydroxycarbonyl)methyl-[2,2′;5′,2′′]terthiophen-3′-yl}acetic acid and 9-(hydroxylcarbonyl)methyl-2,7-dithien-2-yl[fluoren-9-yl]acetic acid, which we denote as L1H 2 and L2H 2 , respectively, see Figure . Details of their synthesis and optical properties have been reported in a previous work . We recall that IR spectra of the complexes show significant differences in the carboxylate vibrational frequency region in relation to the presence of phenanthroline or pyridine as a competitive ancillary ligand.…”

Section: Introductionmentioning

confidence: 91%

“…previous work. 6 We recall that IR spectra of the complexes show significant differences in the carboxylate vibrational frequency region in relation to the presence of phenanthroline or pyridine as a competitive ancillary ligand.…”

Section: Introductionmentioning

confidence: 98%

Environment Effects on the CO Vibrational Shifts in Erbium Complexes: A Quantum Chemical Study

2008

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The stability of lanthanide complexes and the efficiency of the energy transfer process, which makes these molecules interesting materials for technological applications, are correlated to the chemical environment surrounding the metal ion. In particular the efficiency depends on the relative position of the antenna (the ligand moiety that acts as photon absorption center) and the lanthanide ion (the emitting center), while the stability of the complex is correlated to the strength of the coordination between the rare earth and the ligands. For these reasons, knowledge of the structural properties of the complex is an interesting task to achieve. Since a large number of ligand structures hold the carboxylate group (COO(-)), which is used as an anchor for binding the antennae to the lanthanide ion, in this work we will show how the vibrational shifts of this group, induced by the interactions between the carboxylate moiety and the metal center of the lanthanide complex, can be used for obtaining in a simple way information on the structure of the chemical environment surrounding the lanthanide ion.

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“…Various trimer carboxylic acids have been prepared, directly connected to the thiophene rings [ 342 , 343 , 344 , 345 ] or linked through a spacer. In fact, spacers of one [ 346 , 347 , 348 , 349 , 350 , 351 , 352 ], two [ 279 , 353 , 354 ], three [ 355 ], four [ 354 ], five [ 356 ] or six [ 350 ] carbon atoms are reported ( Scheme 18 , I and II). Benzoic acid, connected in para on position 3′, is also reported ( Scheme 18 , III) [ 249 , 357 ].…”

Section: Trimer Structuresmentioning

confidence: 99%

“…Furthermore, in order to avoid the esterification and the hydrolysis steps, in some works the carboxylic acid is obtained by hydrolysis of nitrile [ 313 , 342 , 345 ]. The negative charge of carboxylic acid is widely exploited for promoting attractive interactions between the trimer and other molecules, materials or surfaces [ 349 , 350 , 355 , 358 , 359 ]. Additionally, trimers carrying a carboxylic acid can be easily functionalized by esterification or amidation [ 343 , 346 , 347 , 360 ].…”

Section: Trimer Structuresmentioning

confidence: 99%

Thiophene-Based Trimers and Their Bioapplications: An Overview

et al. 2021

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Certainly, the success of polythiophenes is due in the first place to their outstanding electronic properties and superior processability. Nevertheless, there are additional reasons that contribute to arouse the scientific interest around these materials. Among these, the large variety of chemical modifications that is possible to perform on the thiophene ring is a precious aspect. In particular, a turning point was marked by the diffusion of synthetic strategies for the preparation of terthiophenes: the vast richness of approaches today available for the easy customization of these structures allows the finetuning of their chemical, physical, and optical properties. Therefore, terthiophene derivatives have become an extremely versatile class of compounds both for direct application or for the preparation of electronic functional polymers. Moreover, their biocompatibility and ease of functionalization make them appealing for biology and medical research, as it testifies to the blossoming of studies in these fields in which they are involved. It is thus with the willingness to guide the reader through all the possibilities offered by these structures that this review elucidates the synthetic methods and describes the full chemical variety of terthiophenes and their derivatives. In the final part, an in-depth presentation of their numerous bioapplications intends to provide a complete picture of the state of the art.

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New erbium complexes emitting in infrared region based on oligothiophene and thiophenefluorene carboxylate

Cited by 18 publications

References 21 publications

Sentitized near-infrared emission in novel neodymium complexes bearing oligothiophene derivatives as antennae

Sentitized near-infrared emission in novel neodymium complexes bearing oligothiophene derivatives as antennae

Environment Effects on the CO Vibrational Shifts in Erbium Complexes: A Quantum Chemical Study

Thiophene-Based Trimers and Their Bioapplications: An Overview

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