hydrogen bond - ορισμός. Τι είναι το hydrogen bond
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Τι (ποιος) είναι hydrogen bond - ορισμός

FORM OF ASSOCIATION BETWEEN AN ELECTRONEGATIVE ATOM AND A HYDROGEN ATOM ATTACHED TO A SECOND, RELATIVELY ELECTRONEGATIVE ATOM
Hydrogen bonding; H bond; H-bond; Hydrogen bonds; Hydrogen Bond; Hydrogen Bond acceptor; Hydrogen bond acceptor; Hydrogen bond receiver; Secondary hydrogen bond; Tertiary hydrogen bond; Hydrogen-bonding; H-bonding; Hydrogen-bonded network; Hydrogen Bonding; Resonance-assisted hydrogen bond; Hydrogen-bond; Hydrogen Bonds; Resonance assisted hydrogen bond; Bifurcated bonding; H-bonds
  • Cyclic dimer of acetic acid; dashed <span style="color:green;">'''green'''</span> lines represent hydrogen bonds
  • Intramolecular]] hydrogen bonding in [[acetylacetone]] helps stabilize the [[enol]] [[tautomer]].
  • Hydrogen bonding between [[guanine]] and [[cytosine]], one of two types of [[base pair]]s in DNA
  • The structure of part of a DNA [[double helix]]
  • Examples of hydrogen bond donating (donors) and hydrogen bond accepting groups (acceptors)
  • Structure of [[nickel bis(dimethylglyoximate)]], which features two linear hydrogen-bonds.
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hydrogen bond         
¦ noun Chemistry a weak chemical bond resulting from electrostatic attraction between a proton in one molecule and an electronegative atom in another.
Low-barrier hydrogen bond         
LBHB; Low-barrier hydrogen bonding; Low barrier hydrogen bond; Short-strong hydrogen bond; Single-well hydrogen bond
A Low-barrier hydrogen bond (LBHB) is a special type of hydrogen bond. LBHBs can occur when the pKa of the two heteroatoms are closely matched, which allows the hydrogen to be more equally shared between them.
Carbon–hydrogen bond         
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COVALENT BOND BETWEEN CARBON AND HYDROGEN
Carbon-hydrogen bonds; C-H bond; Carbon-hydrogen bond; C–H bond; C–H bonds; C-H bonds
In chemistry, the carbon-hydrogen bond ( bond) is a chemical bond between carbon and hydrogen atoms that can be found in many organic compounds. This bond is a covalent, single bond, meaning that carbon shares its outer valence electrons with up to four hydrogens.

Βικιπαίδεια

Hydrogen bond

In chemistry, a hydrogen bond (or H-bond) is a primarily electrostatic force of attraction between a hydrogen (H) atom which is covalently bound to a more electronegative "donor" atom or group (Dn), and another electronegative atom bearing a lone pair of electrons—the hydrogen bond acceptor (Ac). Such an interacting system is generally denoted Dn−H···Ac, where the solid line denotes a polar covalent bond, and the dotted or dashed line indicates the hydrogen bond. The most frequent donor and acceptor atoms are the second-row elements nitrogen (N), oxygen (O), and fluorine (F).

Hydrogen bonds can be intermolecular (occurring between separate molecules) or intramolecular (occurring among parts of the same molecule). The energy of a hydrogen bond depends on the geometry, the environment, and the nature of the specific donor and acceptor atoms and can vary between 1 and 40 kcal/mol. This makes them somewhat stronger than a van der Waals interaction, and weaker than fully covalent or ionic bonds. This type of bond can occur in inorganic molecules such as water and in organic molecules like DNA and proteins. Hydrogen bonds are responsible for holding materials such as paper and felted wool together, and for causing separate sheets of paper to stick together after becoming wet and subsequently drying.

The hydrogen bond is responsible for many of the physical and chemical properties of compounds of N, O, and F that seem unusual compared with other similar structures. In particular, intermolecular hydrogen bonding is responsible for the high boiling point of water (100 °C) compared to the other group-16 hydrides that have much weaker hydrogen bonds. Intramolecular hydrogen bonding is partly responsible for the secondary and tertiary structures of proteins and nucleic acids. It also plays an important role in the structure of polymers, both synthetic and natural.