scholarly journals Role of π−d hybridization in a 300-K organic-magnetic interface: Metal-free phthalocyanine single molecules on a bcc Fe(001) whisker

2016 ◽  
Vol 94 (19) ◽  
Author(s):  
T. K. Yamada ◽  
Y. Yamagishi ◽  
S. Nakashima ◽  
Y. Kitaoka ◽  
K. Nakamura
Keyword(s):  
Single Molecules ◽  
Metal Free

Formation of Oriented Nanostructures from Single Molecules of Conjugated Polymers in Microdroplets of Solution:  The Role of Solvent

2004 ◽  
Vol 37 (16) ◽  
pp. 6132-6140 ◽  
Author(s):  
Pradeep Kumar ◽  
Adosh Mehta ◽  
Shannon M. Mahurin ◽  
Sheng Dai ◽  
Mark D. Dadmun ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Single Molecules ◽  
Role Of Solvent

scholarly journals Role of flexible bulky groups and weak interactions involving halogens in the vapoluminescence of a metal-free dye

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74506-74509 ◽  
Author(s):  
Y. Akune ◽  
R. Hirosawa ◽  
H. Takahashi ◽  
M. Shiro ◽  
S. Matsumoto
Keyword(s):  
Weak Interactions ◽  
Molecular Flexibility ◽  
Metal Free

The vapoluminescence of a 2,5-diamino-3,6-dicyanopyrazine dye was correlated with molecular flexibility of bulky substituents and weak interactions involving halogens.

scholarly journals Catalytic oxidative desulfurization of a 4,6-DMDBT containing model fuel by metal-free activated carbons: the key role of surface chemistry

2019 ◽  
Vol 21 (24) ◽  
pp. 6685-6698 ◽  
Author(s):  
Zoi Christina Kampouraki ◽  
Dimitrios A. Giannakoudakis ◽  
Konstantinos S. Triantafyllidis ◽  
Eleni A. Deliyanni
Keyword(s):  
Surface Chemistry ◽  
Activated Carbons ◽  
Oxidative Desulfurization ◽  
Ambient Conditions ◽  
Metal Free ◽  
Model Fuel ◽  
Catalytic Oxidative Desulfurization

Commercial micro/mesoporous activated carbons were utilized as metal-free catalysts for the desulfurization of a model fuel, i.e. 4,6-dimethyldibenzothiophene (4,6-DMDBT) in hexadecane, under ambient conditions. Oxidation of carbons led to a further catalytic improvement.

scholarly journals Insights into the promotion role of phosphorus doping on carbon as a metal-free catalyst for low-temperature selective catalytic reduction of NO with NH3

RSC Advances ◽  
2020 ◽  
Vol 10 (22) ◽  
pp. 12908-12919
Author(s):  
Weifeng Li ◽  
Shuangling Jin ◽  
Rui Zhang ◽  
Yabin Wei ◽  
Jiangcan Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
No Reduction ◽  
Catalytic Reduction ◽  
Carbon Aerogels ◽  
Phosphorus Doping ◽  
Reduction Of No ◽  
Metal Free

P species can effectively enhance the catalytic activity of carbon aerogels for NO reduction at low temperature.

scholarly journals 1,3-Dioxolan-4-Ones as Promising Monomers for Aliphatic Polyesters: Metal-Free, in Bulk Preparation of PLA

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2396
Author(s):  
Stefano Gazzotti ◽  
Marco Aldo Ortenzi ◽  
Hermes Farina ◽  
Alessandra Silvani
Keyword(s):  
Molecular Weight ◽  
Thermal Properties ◽  
Acid Catalyst ◽  
Monomer Conversion ◽  
Reaction Conditions ◽  
Aliphatic Polyesters ◽  
Metal Free ◽  
Weight Growth ◽  
Double Activation

The first example of solvent-free, organocatalyzed, polymerization of 1,3-dioxolan-4-ones, used as easily accessible monomers for the synthesis of polylactic acid (PLA), is described here. An optimization of reaction conditions was carried out, with p-toluensulfonic acid emerging as the most efficient Brønsted acid catalyst. The reactivity of the monomers in the tested conditions was studied following the monomer conversion by 1H NMR and the molecular weight growth by SEC analysis. A double activation polymerization mechanism was proposed, pointing out the key role of the acid catalyst. The formation of acetal bridges was demonstrated, to different extents depending on the nature of the aldehyde or ketone employed for lactic acid protection. The polymer shows complete retention of stereochemistry, as well as good thermal properties and good polydispersity, albeit modest molecular weight.

scholarly journals Metal-free disproportionation of formic acid mediated by organoboranes

2016 ◽  
Vol 7 (9) ◽  
pp. 5680-5685 ◽  
Author(s):  
Clément Chauvier ◽  
Pierre Thuéry ◽  
Thibault Cantat
Keyword(s):  
Formic Acid ◽  
Mechanistic Studies ◽  
Metal Free ◽  
Aldehyde Reduction

In the presence of dialkylboranes, formic acid is converted to formaldehyde and methanol derivatives. This is the first example of formate disproportionation under metal-free conditions. Mechanistic studies highlight the role of transient borohydrides in the reduction of formates and this is further shown in transfer hydroboration for aldehyde reduction.

scholarly journals Metal-Free Perovskites for Non-Linear Optical Materials

2019 ◽  
Author(s):  
Thomas W. Kasel ◽  
Zeyu Deng ◽  
Austin Mroz ◽  
Christopher H. Hendon ◽  
Keith Butler ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
First Principles Calculations ◽  
Halide Anion ◽  
Metal Free ◽  
Organic Group ◽  
Nlo Response ◽  
Earth Abundant

<div> <div> <div> <p>We identify the existence of nonlinear optical (NLO) activity in a number of novel ABX3-type metal-free perovskites, where A is a highly tuneable organic cation, B is a NH4 cation and X a halide anion. Through systematic first-principles calculations, we identify important trends to chart the second-harmonic generation of this class of materials. We study three perovskites MDABCO- NH4 I3 , CNDABCO-NH4 I3 and ODABCO-NH4 I3 for use as deep-UV second-harmonic generation materials. We identify the role of the dipole moment imparted by the organic group on the A cation as an important parameter to tune the NLO properties of these materials. We apply this knowledge functionalising the organic group DABCO with the highly polar cyanide CN group, and we demonstrate a significant improvement of the NLO response in this family of materials. These findings can accelerate the application of metal free perovskites as inexpensive, non-toxic, earth-abundant materials for the next generation of optical communication applications. </p> </div> </div> </div>

A noble-metal-free photocatalyst system obtained using BODIPY-based MOFs for highly efficient visible-light-driven H2 evolution

2019 ◽  
Vol 7 (36) ◽  
pp. 20742-20749 ◽  
Author(s):  
Heng Yang ◽  
Ming Zhao ◽  
Jing Zhang ◽  
Ji Ma ◽  
Pengyan Wu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Noble Metal ◽  
H2 Evolution ◽  
Metal Free ◽  
Highly Efficient ◽  
Visible Light Driven

This study provides fundamental insights into the role of porosity in photocatalytic activity and might inform the ongoing efforts toward the noble-metal-free photocatalytic systems via BODIPY-based MOFs for visible-light-promoted H2 evolution.

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