Solid-state fluorescence of two zinc coordination polymers from bulky dicyano-phenylenevinylene and bis-azobenzene cores

Diana, Rosita; Panunzi, Barbara; Piotto, Stefano; Caruso, Tonino; Caruso, Ugo

doi:10.1016/j.inoche.2019.107602

Cited by 7 publications

(5 citation statements)

References 53 publications

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“…RGB (redgreen-blue) emission color tuning in ethanol was obtained by increasing the withdrawing strength of the substituent. PLQYs of the complexes are higher with respect to similar zinc coordinated systems [29,74,[121][122][123], due to the electrostatic repulsions between the cationic chains and implemented respect to the free ligands, due to the CHEF effect. The same fluoro, cyano, and nitro substituents and the charged chain guaranteeing solubility were employed by grafting the coordination moieties to a preformed PVPy (Figure 10).…”

Section: Ono Ligandsmentioning

confidence: 90%

“…Finally, the aggregate nature of materials consisting of fluorophores frozen into polymeric chains or networks give rise to noticeable changes in the energetic levels of the ligands. The assembly of emissive pincers by zinc coordination produces the most varied polymeric structures: coordination polymers (CPs) obtained by zinc bridges [22][23][24][25], metallated polymers obtained by coordination with pre-formed chains [26,27], and polymeric networks obtained by interlacing of flexible zinc-crossed fluorophores [28][29][30]. Owing to both the restrictions imposed to fluorophore and the efficient electron hopping in the tight structure, relevant emission tuning with respect to the free ligands and to mononuclear structures is envisaged.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Zinc(II) Ion in Fluorescence Tuning of Tridentate Pincers: A Review

Diana

Panunzi

2020

Molecules

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Tridentate ligands are simple low-cost pincers, easy to synthetize, and able to guarantee stability to the derived complexes. On the other hand, due to its unique mix of structural and optical properties, zinc(II) ion is an excellent candidate to modulate the emission pattern as desired. The present work is an overview of selected articles about zinc(II) complexes showing a tuned fluorescence response with respect to their tridentate ligands. A classification of the tridentate pincers was carried out according to the binding donor atom groups, specifically nitrogen, oxygen, and sulfur donor atoms, and depending on the structure obtained upon coordination. Fluorescence properties of the ligands and the related complexes were compared and discussed both in solution and in the solid state, keeping an eye on possible applications.

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Section: Ono Ligandsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

The Role of Zinc(II) Ion in Fluorescence Tuning of Tridentate Pincers: A Review

Diana

Panunzi

2020

Molecules

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“…There are several studies in the literature on the coordination of azobenzene molecules with different metal ions such as Cu (II), Zn (II), Hg (II), Co (II), Ni (II), Cr (III), and Fe (III) [ 2 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ].…”

Section: Antimicrobial Organometallic Azo Compoundsmentioning

confidence: 99%

Azobenzene as Antimicrobial Molecules

et al. 2022

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Azo molecules, characterized by the presence of a -N=N- double bond, are widely used in various fields due to their sensitivity to external stimuli, ch as light. The emergence of bacterial resistance has pushed research towards designing new antimicrobial molecules that are more efficient than those currently in use. Many authors have attempted to exploit the antimicrobial activity of azobenzene and to utilize their photoisomerization for selective control of the bioactivities of antimicrobial molecules, which is necessary for antibacterial therapy. This review will provide a systematic and consequential approach to coupling azobenzene moiety with active antimicrobial molecules and drugs, including small and large organic molecules, such as peptides. A selection of significant cutting-edge articles collected in recent years has been discussed, based on the structural pattern and antimicrobial performance, focusing especially on the photoactivity of azobenzene and the design of smart materials as the most targeted and desirable application.

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“…Despite azobenzene derivatives being archetypical molecular switches [4,8,9], heteroaryl azo compounds have recently attracted attention [10][11][12]. Heteroaryl azo dyes offer a broader structural and spectral diversity [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Insights into a Novel Lightfast Thiophene Azo Dye

Diana,

Sessa,

Concilio

et al. 2023

Crystals

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Thiophene ring-enhancing electron delocalization imparts unique properties to azoic chromophore tools. The novel TA-OH dye contains a push–pull π-electron system, including a thiophene-azo scaffold with a hydroxyl group at the ortho position to the azo bridge. The hydroxyl group is expected to lock the azo bridge in its trans conformation, concurring with the photostability and fastness of the dye. The single crystal analysis identified the molecule’s primary conjugation plane, and the theoretical analysis provided electronic pattern insights. The absorption behavior and the trans-to-cis conversion were examined from both experimental and theoretical perspectives. The effect of solvent polarity and the role of pH on the photophysical properties were explored. The solvent polarity strongly affects the absorbance spectrum of TA-OH, therefore potentially making NLO active. Additionally, TA-OH exhibited pH responsiveness akin to classic dichromatic pH indicators, with a noticeable color shift from red to blue observed as pH transitioned from neutral to alkaline. Absorbance titration experiments, along with experimental/theoretical determination of pKa, defined the pH sensing ability.

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Solid-state fluorescence of two zinc coordination polymers from bulky dicyano-phenylenevinylene and bis-azobenzene cores

Cited by 7 publications

References 53 publications

The Role of Zinc(II) Ion in Fluorescence Tuning of Tridentate Pincers: A Review

The Role of Zinc(II) Ion in Fluorescence Tuning of Tridentate Pincers: A Review

Azobenzene as Antimicrobial Molecules

Experimental and Theoretical Insights into a Novel Lightfast Thiophene Azo Dye

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