Reactions of coordinated molecules. 40. Addition of a platinum-hydrogen bond across metal acetylide carbon-carbon triple bonds: a direct route to dinuclear .mu.-vinylidene complexes

1984 ◽  
Vol 106 (10) ◽  
pp. 3050-3052 ◽  
Author(s):  
Dawood Afzal ◽  
P. Galen Lenhert ◽  
C. M. Lukehart
Keyword(s):  
Hydrogen Bond ◽  
Triple Bonds ◽  
Vinylidene Complexes ◽  
Direct Route

Ruthenium Vinylidene Complexes Generated by Selective 1,2-Migration of P- and S-Substituents: Synthesis, Structures, and Dichromism Arising from an Intramolecular CH···O Hydrogen Bond

2020 ◽  
Vol 39 (5) ◽  
pp. 711-718 ◽  
Author(s):  
Takuya Kuwabara ◽  
Yutaka Aoki ◽  
Kousuke Sakajiri ◽  
Kazuki Deguchi ◽  
Shuhei Takamori ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Vinylidene Complexes

A Hydrogen Bond Between Linear Tetrapyrrole and Conserved Aspartate Causes the Far-Red Shifted Absorption of Phytochrome Photoreceptors

2020 ◽  
Author(s):  
Egle Maximowitsch ◽  
Tatiana Domratcheva
Keyword(s):  
Hydrogen Bond ◽  
Light Adaptation ◽  
Positive Charge ◽  
Pyrrole Ring ◽  
Md Simulations ◽  
Spectral Shift ◽  
Specific Domain ◽  
Study Guides ◽  
Rational Engineering ◽  
Tuning Mechanism

Photoswitching of phytochrome photoreceptors between red-absorbing (Pr) and far-red absorbing (Pfr) states triggers light adaptation of plants, bacteria and other organisms. Using quantum chemistry, we elucidate the color-tuning mechanism of phytochromes and identify the origin of the Pfr-state red-shifted spectrum. Spectral variations are explained by resonance interactions of the protonated linear tetrapyrrole chromophore. In particular, hydrogen bonding of pyrrole ring D with the strictly conserved aspartate shifts the positive charge towards ring D thereby inducing the red spectral shift. Our MD simulations demonstrate that formation of the ring D–aspartate hydrogen bond depends on interactions between the chromophore binding domain (CBD) and phytochrome specific domain (PHY). Our study guides rational engineering of fluorescent phytochromes with a far-red shifted spectrum.

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