Carbonaceous chondrites contain up to 5% by weight of organic matter, including important prebiotic molecules. The majority of the organic matter in carbonaceous chondrites (some 70–90%) occurs as complex, cross-linked macromolecular materials. These macromolecular materials may have had a role in ...
Carbon molecular sieve (CMS) membranes efficiently separate gas mixtures tuning the pore size of CMS membranes remains challenging. Here, the authors report an approach to finely modulate CMS pore structure via reactive Al(CH3)3 to atomic-level Al2O3 and defluorinated the polymer precursor in sit...
Today, named chemical reactions play a crucial role in organic chemistry, which continues to grow in its ability to construct ever more complex and diverse chemical molecules. The first named reaction in organic synthesis, the Lieben Haloform Reaction, had its origin in 1822 when Serullas found...
Also the modelled SOA elemental composition is in agreement with the observations (Fig.2c), although the model gives slightly higher hydrogen-to-carbon ratios (H:C). Both the modelled and measured oxygen-to-carbon ratios (O:C) of the total SOA mass are around 0.62, while the modelled O:...
Total organic carbon(TOC) is a method that can be used to monitor the purity of DI water for the presence of organic molecules that do not ionize, are notsoluble, and present above their critical micelle concentration. If the organic contaminant does not ionize, it is undetectable by a cond...
3Large molecules are common Compounds are encountered withmolecular formulaesuch as C20H40, with 20 carbon (C) atoms and 40 hydrogen (H) atoms. Many important biological compounds are what are calledmacromoleculesand are very large. They arepolymersmade up of many repeating units. For example,...
In this work, using TOCNFs as the polymer matrix, we fabricated MOFs-derived cobalt hollow carbon cage (Co-HCC) via in situ epitaxial growth and pyrolysis. Then, the hollow MOFs/layered MXene/nanocellulose (HMN) composite films with alternating electromagnetic structures were designed by the alte...
The layers then stacked along the < 001 > direction with N = O···H–C hydrogen bonds (ca. 3.6 Å from the oxygen to carbon atoms) between the nitro and dimethylamino groups of neighboring molecules. One-dimensional (1-D) grooves, which were parallel to the < ...
Based on negative and positive ion ultrahigh-resolution electrospray ionization (ESI) FT-ICR MS, elemental compositions of 402 N-containing compounds were determined and five main groups of compound classes (compounds containing carbon, hydrogen, oxygen, and N detected as positive ions (CHON+), ...
powerful approach to access complex molecules, yet it is hindered by precise remote C(sp3)–H activation. Now, the accurate translocation of functional groups and remote C–H desaturation has been achieved in parallel through combining functional group migration and cobalt-promoted hydrogen atom ...