scholarly journals Mechanochromic Switching between Delayed Fluorescence and Phosphorescence of Luminescent Coordination Polymers Composed of Dinuclear Copper(I) Iodide Rhombic Cores

2018 ◽  
Vol 24 (55) ◽  
pp. 14750-14759 ◽  
Author(s):  
Atsushi Kobayashi ◽  
Yuya Yoshida ◽  
Masaki Yoshida ◽  
Masako Kato
Keyword(s):  
Coordination Polymers ◽  
Delayed Fluorescence ◽  
Dinuclear Copper ◽  
Fluorescence And Phosphorescence

Stimuli responsive and reversible crystalline–amorphous transformation in a molecular solid: fluorescence switching and enhanced phosphorescence in the amorphous state

2019 ◽  
Vol 7 (23) ◽  
pp. 7083-7089 ◽  
Author(s):  
Pagidi Sudhakar ◽  
T. P. Radhakrishnan
Keyword(s):  
Amorphous State ◽  
Delayed Fluorescence ◽  
Sharp Contrast ◽  
Stimuli Responsive ◽  
Fluorescence Switching ◽  
Solid Fluorescence ◽  
External Stimuli ◽  
Fluorescence And Phosphorescence ◽  
Molecular Solid

A diaminodicyanoquinodimethane molecule based material undergoes reversible crystalline–amorphous transformation upon external stimuli. Significantly, delayed fluorescence and phosphorescence are observed in the material, with an unusual enhancement of the latter in the amorphous state, in sharp contrast to the decrease in fluorescence.

Delayed Fluorescence and Phosphorescence from Polyphenylquinoxalines

2002 ◽  
Vol 106 (46) ◽  
pp. 11045-11053 ◽  
Author(s):  
A. Hayer ◽  
Bässler ◽  
B. Falk ◽  
S. Schrader
Keyword(s):  
Delayed Fluorescence ◽  
Fluorescence And Phosphorescence

Supramolecular architectures in CoIIand CuIIcomplexes with thiophene-2-carboxylate and 2-amino-4,6-dimethoxypyrimidine ligands

2016 ◽  
Vol 72 (5) ◽  
pp. 442-450 ◽  
Author(s):  
Ammasai Karthikeyan ◽  
Packianathan Thomas Muthiah ◽  
Franc Perdih
Keyword(s):  
Hydrogen Bonds ◽  
Water Molecule ◽  
Coordination Polymers ◽  
Three Dimensional ◽  
Functional Materials ◽  
Supramolecular Architecture ◽  
Dinuclear Copper ◽  
One Dimensional ◽  
Wide Range ◽  
The One

The coordination chemistry of mixed-ligand complexes continues to be an active area of research since these compounds have a wide range of applications. Many coordination polymers and metal–organic framworks are emerging as novel functional materials. Aminopyrimidine and its derivatives are flexible ligands with versatile binding and coordination modes which have been proven to be useful in the construction of organic–inorganic hybrid materials and coordination polymers. Thiophenecarboxylic acid, its derivatives and their complexes exhibit pharmacological properties. Cobalt(II) and copper(II) complexes of thiophenecarboxylate have many biological applications, for example, as antifungal and antitumor agents. Two new cobalt(II) and copper(II) complexes incorporating thiophene-2-carboxylate (2-TPC) and 2-amino-4,6-dimethoxypyrimidine (OMP) ligands have been synthesized and characterized by X-ray diffraction studies, namely (2-amino-4,6-dimethoxypyrimidine-κN)aquachlorido(thiophene-2-carboxylato-κO)cobalt(II) monohydrate, [Co(C5H3O2S)Cl(C6H9N3O2)(H2O)]·H2O, (I), andcatena-poly[copper(II)-tetrakis(μ-thiophene-2-carboxylato-κ2O:O′)-copper(II)-(μ-2-amino-4,6-dimethoxypyrimidine-κ2N1:N3)], [Cu2(C5H3O2S)4(C6H9N3O2)]n, (II). In (I), the CoIIion has a distorted tetrahedral coordination environment involving one O atom from a monodentate 2-TPC ligand, one N atom from an OMP ligand, one chloride ligand and one O atom of a water molecule. An additional water molecule is present in the asymmetric unit. The amino group of the coordinated OMP molecule and the coordinated carboxylate O atom of the 2-TPC ligand form an interligand N—H...O hydrogen bond, generating anS(6) ring motif. The pyrimidine molecules also form a base pair [R22(8) motif]viaa pair of N—H...N hydrogen bonds. These interactions, together with O—H...O and O—H...Cl hydrogen bonds and π–π stacking interactions, generate a three-dimensional supramolecular architecture. The one-dimensional coordination polymer (II) contains the classical paddle-wheel [Cu2(CH3COO)4(H2O)2] unit, where each carboxylate group of four 2-TPC ligands bridges two square-pyramidally coordinated CuIIions and the apically coordinated OMP ligands bridge the dinuclear copper units. Each dinuclear copper unit has a crystallographic inversion centre, whereas the bridging OMP ligand has crystallographic twofold symmetry. The one-dimensional polymeric chains self-assembleviaN—H...O, π–π and C—H...π interactions, generating a three-dimensional supramolecular architecture.

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