Carbon-proton Connectivity
Carbon-proton Connectivity - Related Videos
09:40
Proton Exchange Membrane Fuel Cells
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University The United States consumes a large amount of energy – the current rate is around 97.5 quadrillion BTUs annually. The vast majority (90%) of this energy comes from non-renewable fuel sources. This energy is used for electricity (39%), transportation (28%), industry (22%), and residential/commercial use (11%). As the world has a limited supply of these non-renewable sources, the United States (among others) is...
07:38
Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
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Cited by 4 •
2015
The first part of this article shows how to select mutant cell lines expressing vesicular Na+/H+ exchangers at their plasma membrane. The second part provides protocols based on intracellular pH measurements and fast ion uptake, which are used to determine the ion selectivity and the kinetic parameters of these exchangers.
01:14
The Carbon Cycle
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2019
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle. Biological Carbon Cycle All...
01:23
Dietary Connections
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2019
In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used as energy sources to produce...
01:07
Proton (¹H) NMR: Chemical Shift
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2024
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal. Absorption signals of all the protium nuclei in a...
FAQs
One-bond carbon-proton correlations identify carbon and hydrogen nuclei that are directly attached. This provides a local structural constraint: a detected pair can be assigned to a specific C-H relationship rather than merely showing that the nuclei belong to the same molecule. Such direct-link information helps organize NMR signal assignments and supplies starting points for building the molecular framework.
Longer-range correlations extend structural analysis beyond directly bonded pairs. When a carbon and proton are connected through two or more bonds, the observed relationship can link separate local assignments and suggest how portions of a molecular framework connect. These correlations are especially useful when direct one-bond information alone does not establish the complete arrangement of atoms.
Together, the two correlation types provide complementary structural evidence. One-bond relationships establish direct attachments, while two-or-more-bond relationships connect those local findings across a larger portion of the molecule. Reading them together helps chemists move from individual carbon-proton assignments to a coherent molecular framework when evaluating an unknown structure.
Interpretation can proceed from the most direct evidence to the more extended evidence. Chemists first use one-bond correlations to associate directly attached carbon and proton signals, then examine longer-range correlations for links across two or more bonds. The resulting assignments can be organized into a molecular framework, supporting identification of an unknown organic compound.
It provides structural evidence that connects NMR signal assignments to atom-to-atom relationships. Direct correlations indicate which carbon and proton signals represent attached pairs, while longer-range correlations help extend those assignments through the molecular framework. By combining these relationships, chemists can use the NMR data to assess the structure and identity of an unknown organic compound.
Both areas require reliable structural information about organic molecules. Carbon-proton connectivity helps establish how observed NMR signals fit together and how portions of a molecular framework are connected. In organic synthesis, that information can support examination of the intended compound, while in natural-products research it can assist structural study and compound identification.
In pharmaceutical research, connectivity information contributes to determining and checking molecular structures through NMR signal assignments and framework construction. In quality control, the same structural relationships provide a basis for examining the molecular identity of an analyzed organic compound. Its value in both settings comes from linking NMR observations to specific carbon-hydrogen arrangements.