Light-emitting iridium(iii) and ruthenium(ii) polypyridyl complexes containing quadruple hydrogen-bonding moieties

2006 ◽  
pp. 1636-1644 ◽  
Author(s):  
Veronica Marin ◽  
Elisabeth Holder ◽  
Richard Hoogenboom ◽  
Emine Tekin ◽  
Ulrich S. Schubert
Keyword(s):  
Hydrogen Bonding ◽  
Polypyridyl Complexes ◽  
Light Emitting ◽  
Quadruple Hydrogen Bonding

scholarly journals Quadruple Hydrogen Bond-Containing A-AB-A Triblock Copolymers: Probing the Influence of Hydrogen Bonding in the Central Block

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4705
Author(s):  
Boer Liu ◽  
Xi Chen ◽  
Glenn A. Spiering ◽  
Robert B. Moore ◽  
Timothy E. Long
Keyword(s):  
Hydrogen Bonding ◽  
Self Assembly ◽  
Microphase Separation ◽  
Triblock Copolymers ◽  
Random Copolymer ◽  
Thermomechanical Properties ◽  
Structure Property ◽  
Scanning Calorimetry ◽  
Central Block ◽  
Quadruple Hydrogen Bonding

This work reveals the influence of pendant hydrogen bonding strength and distribution on self-assembly and the resulting thermomechanical properties of A-AB-A triblock copolymers. Reversible addition-fragmentation chain transfer polymerization afforded a library of A-AB-A acrylic triblock copolymers, wherein the A unit contained cytosine acrylate (CyA) or post-functionalized ureido cytosine acrylate (UCyA) and the B unit consisted of n-butyl acrylate (nBA). Differential scanning calorimetry revealed two glass transition temperatures, suggesting microphase-separation in the A-AB-A triblock copolymers. Thermomechanical and morphological analysis revealed the effects of hydrogen bonding distribution and strength on the self-assembly and microphase-separated morphology. Dynamic mechanical analysis showed multiple tan delta (δ) transitions that correlated to chain relaxation and hydrogen bonding dissociation, further confirming the microphase-separated structure. In addition, UCyA triblock copolymers possessed an extended modulus plateau versus temperature compared to the CyA analogs due to the stronger association of quadruple hydrogen bonding. CyA triblock copolymers exhibited a cylindrical microphase-separated morphology according to small-angle X-ray scattering. In contrast, UCyA triblock copolymers lacked long-range ordering due to hydrogen bonding induced phase mixing. The incorporation of UCyA into the soft central block resulted in improved tensile strength, extensibility, and toughness compared to the AB random copolymer and A-B-A triblock copolymer comparisons. This study provides insight into the structure-property relationships of A-AB-A supramolecular triblock copolymers that result from tunable association strengths.

Use of Quadruple Hydrogen Bonding as the Switching Phase in Thermo- and Light-Responsive Shape Memory Hydrogel

2021 ◽  
Author(s):  
Yufang Song ◽  
Yiming Chen ◽  
Ran Chen ◽  
Hongji Zhang ◽  
Dongjian Shi ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Shape Memory ◽  
Quadruple Hydrogen Bonding

ChemInform Abstract: Assemblies of Luminescent Ruthenium(II)- and Osmium(II)-polypyridyl Complexes Based on Hydrogen Bonding

ChemInform ◽  
2010 ◽  
Vol 29 (38) ◽  
pp. no-no
Author(s):  
M. D. WARD ◽  
C. M. WHITE ◽  
F. BARIGELLETTI ◽  
N. ARMAROLI ◽  
G. CALOGERO ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Polypyridyl Complexes

Novel Pillar[5]arene-Based Dynamic Polyrotaxanes Interlocked by the Quadruple Hydrogen Bonding Ureidopyrimidinone Motif

2012 ◽  
Vol 14 (18) ◽  
pp. 4826-4829 ◽  
Author(s):  
Xiao-Yu Hu ◽  
Xuan Wu ◽  
Qunpeng Duan ◽  
Tangxin Xiao ◽  
Chen Lin ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Quadruple Hydrogen Bonding

ChemInform Abstract: A Supramolecular Array of Fullerenes by Quadruple Hydrogen Bonding.

ChemInform ◽  
2010 ◽  
Vol 33 (29) ◽  
pp. no-no
Author(s):  
Luis Sanchez ◽  
Minze T. Rispens ◽  
Jan C. Hummelen
Keyword(s):  
Hydrogen Bonding ◽  
Quadruple Hydrogen Bonding
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