Subtle substitution controls the rainbow chromatic behaviour of multi-stimuli responsive core-expanded pyrenes

2020 ◽  
Vol 4 (1) ◽  
pp. 268-276 ◽  
Author(s):  
David T. Hogan ◽  
Benjamin S. Gelfand ◽  
Denis M. Spasyuk ◽  
Todd C. Sutherland
Keyword(s):  
Solid State ◽  
Stimuli Responsive ◽  
Substitution Pattern

Core-expanded pyrenes exhibit rainbow solvatochromism, reversible acidochromism in both solution and solid-state, and reversible crystal-to-crystal mechanochromism all governed by substitution pattern.

scholarly journals Oligosilanylated Silocanes

Molecules ◽  
2021 ◽  
Vol 26 (1) ◽  
pp. 244
Author(s):  
Mohammad Aghazadeh Meshgi ◽  
Alexander Pöcheim ◽  
Judith Baumgartner ◽  
Viatcheslav V. Jouikov ◽  
Christoph Marschner
Keyword(s):  
Cyclic Voltammetry ◽  
Solid State ◽  
Xrd Analysis ◽  
29Si Nmr ◽  
Single Crystal Xrd ◽  
Substitution Pattern ◽  
Silyl Group ◽  
Steric Factors ◽  
Single Crystal Xrd Analysis ◽  
29Si Nmr Spectroscopy

A number of mono- and dioligosilanylated silocanes were prepared. Compounds included silocanes with 1-methyl-1-tris(trimethylsilyl)silyl, 1,1-bis[tris(trimethylsilyl)silyl], and 1,1-bis[tris(trimethylsilyl)germyl] substitution pattern as well as two examples where the silocane silicon atom is part of a cyclosilane or oxacyclosilane ring. The mono-tris(trimethylsilyl)silylated compound could be converted to the respective silocanylbis(trimethylsilyl)silanides by reaction with KOtBu and in similar reactions the cyclosilanes were transformed to oligosilane-1,3-diides. However, the reaction of the 1,1-bis[tris(trimethylsilyl)silylated] silocane with two equivalents of KOtBu leads to the replacement of one tris(trimethylsilyl)silyl unit with a tert-butoxy substituent followed by silanide formation via KOtBu attack at one of the SiMe3 units of remaining tris(trimethylsilyl)silyl group. For none of the silylated silocanes, signs of hypercoordinative interaction between the nitrogen and silicon silocane atoms were detected either in the solid state. by single crystal XRD analysis, nor in solution by 29Si-NMR spectroscopy. This was further confirmed by cyclic voltammetry and a DFT study, which demonstrated that the N-Si distance in silocanes is not only dependent on the energy of a potential N-Si interaction, but also on steric factors and through-space interactions of the neighboring groups at Si and N, imposing the orientation of the pz(N) orbital relative to the N-Si-X axis.

scholarly journals Redox-State Dependent Spectroscopic Properties of Porous Organic Polymers Containing Furan, Thiophene, and Selenophene

2017 ◽  
Vol 70 (11) ◽  
pp. 1227 ◽  
Author(s):  
Carol Hua ◽  
Stone Woo ◽  
Aditya Rawal ◽  
Floriana Tuna ◽  
James M. Hook ◽  
...  
Keyword(s):  
Solid State ◽  
Redox State ◽  
Spectroscopic Properties ◽  
Structural Features ◽  
Organic Polymers ◽  
Stimuli Responsive ◽  
Porous Organic Polymers ◽  
Paramagnetic Resonance ◽  
Responsive Materials ◽  
State Dependent

A series of electroactive triarylamine porous organic polymers (POPs) with furan, thiophene, and selenophene (POP-O, POP-S, and POP-Se) linkers have been synthesised and their electronic and spectroscopic properties investigated as a function of redox state. Solid state NMR provided insight into the structural features of the POPs, while in situ solid state Vis-NIR and electron paramagnetic resonance spectroelectrochemistry showed that the distinct redox states in POP-S could be reversibly accessed. The development of redox-active porous organic polymers with heterocyclic linkers affords their potential application as stimuli responsive materials in gas storage, catalysis, and as electrochromic materials.

Substitution Effect on 2-(Oxazolinyl)-phenols: Emission Color-Tunable, Minimalistic Excited-State Intramolecular Proton Transfer (ESIPT)-based Luminophores

2021 ◽  
Author(s):  
Dominik Göbel ◽  
Pascal Rusch ◽  
Daniel Duvinage ◽  
Tim Stauch ◽  
Nadja C. Bigall ◽  
...  
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Solid State ◽  
Substitution Effect ◽  
Optical Characterization ◽  
Intramolecular Proton Transfer ◽  
Substitution Pattern ◽  
Emission Color ◽  
Color Tunable

The synthesis and optical characterization of novel single-benzene ESIPT-based fluorophores is described in solid state and in solution. Special attention is given towards the influence of their unique substitution pattern on their optical properties. Depending on this pattern, aggregation induced emission or aggregation caused quenching (ACQ) is observed in the solid state.<br>

Investigating structure-fluorescence properties of imidazole fused tetraphenylethylene AIEgens: Reversible mechanofluorochromism and polymer matrix controlled fluorescence tuning

CrystEngComm ◽  
2021 ◽  
Author(s):  
Palaniyappan Nagarasu ◽  
Anu Kundu ◽  
Vijay Thiruvenkatam ◽  
Raghavaiah Pallepogu ◽  
Philip Philip Anthony ◽  
...  
Keyword(s):  
Solid State ◽  
Polymer Matrix ◽  
Fluorescence Properties ◽  
Stimuli Responsive ◽  
Fluorescent Properties ◽  
Imidazole Derivatives

A series of stimuli-responsive AIEgens of tetraphenylethyelene (TPE) fused Imidazole derivatives (1-7) were synthesized and explored their substituents controlled fluorescent properties in the solid state. The structure of the synthesized...

Reversible stimuli-responsive luminescence of bimetallic cuprous complexes based on NH-deprotonated 3-(2′-pyridyl)pyrazole

2021 ◽  
Author(s):  
Yang Tong ◽  
xingwei Chen ◽  
Li-Hua He ◽  
Jing-Lin Chen ◽  
Sui-Jun Liu ◽  
...  
Keyword(s):  
Solid State ◽  
Stimuli Responsive ◽  
State Luminescence ◽  
Color Regulation

Color regulation of solid-state luminescence is desirable and challenging. Herein we report two new three- and four-coordinate bimetallic cuprous complexes 1 and 2, which bear a NH-deprotonated 3-(2′-pyridyl)pyrazole adopting monoanionic...

scholarly journals Redox-triggered switching in three-dimensional covalent organic frameworks

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Chao Gao ◽  
Jian Li ◽  
Sheng Yin ◽  
Junliang Sun ◽  
Cheng Wang
Keyword(s):  
Solid State ◽  
Three Dimensional ◽  
Molecular Switches ◽  
Pore Channel ◽  
Pore Surface ◽  
Stimuli Responsive ◽  
Conversion Yield ◽  
Responsive Materials ◽  
Reversible Transformation ◽  
Internal Pore

Abstract The tuning of molecular switches in solid state toward stimuli-responsive materials has attracted more and more attention in recent years. Herein, we report a switchable three-dimensional covalent organic framework (3D COF), which can undergo a reversible transformation through a hydroquinone/quinone redox reaction while retaining the crystallinity and porosity. Our results clearly show that the switching process gradually happened through the COF framework, with an almost quantitative conversion yield. In addition, the redox-triggered transformation will form different functional groups on the pore surface and modify the shape of pore channel, which can result in tunable gas separation property. This study strongly demonstrates 3D COFs can provide robust platforms for efficient tuning of molecular switches in solid state. More importantly, switching of these moieties in 3D COFs can remarkably modify the internal pore environment, which will thus enable the resulting materials with interesting stimuli-responsive properties.

Triphenylamine-based stimuli-responsive solid state fluorescent materials

2020 ◽  
Vol 44 (21) ◽  
pp. 8680-8696 ◽  
Author(s):  
Parthsarathy Gayathri ◽  
Mehboobali Pannipara ◽  
Abdullah G. Al-Sehemi ◽  
Savarimuthu Philip Anthony
Keyword(s):  
Solid State ◽  
Molecular Engineering ◽  
Stimuli Responsive ◽  
Fluorescent Materials

Molecular engineering of triphenylamine (TPA) units produced multi-stimuli-responsive solid state fluorescent materials.

Halogen Atom and Position Dependent Strong Enhancement of Solid‐State Fluorescence and Stimuli Responsive Reversible Fluorescence Switching

2019 ◽  
Vol 4 (13) ◽  
pp. 3884-3890 ◽  
Author(s):  
Parthasarathy Gayathri ◽  
Subramanian Karthikeyan ◽  
Dohyun Moon ◽  
Savarimuthu Philip Anthony
Keyword(s):  
Solid State ◽  
Halogen Atom ◽  
Stimuli Responsive ◽  
Strong Enhancement ◽  
Fluorescence Switching ◽  
Solid State Fluorescence
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