WordNet
- a certificate of debt (usually interest-bearing or discounted) that is issued by a government or corporation in order to raise money; the issuer is required to pay a fixed sum annually until maturity and then a fixed sum to repay the principal (同)bond certificate
- a superior quality of strong durable white writing paper; originally made for printing documents (同)bond_paper
- issue bonds on
- bring together in a common cause or emotion; "The death of their child had drawn them together" (同)bring together, draw together
- of equal importance, rank, or degree
- a number that identifies a position relative to an axis (同)co-ordinate
- be co-ordinated; "These activities coordinate well"
- bring into common action, movement, or condition; "coordinate the painters, masons, and plumbers"; "coordinate his actions with that of his colleagues"; "coordinate our efforts"
- a close personal relationship that forms between people (as between husband and wife or parent and child)
- fastening firmly together (同)soldering
- (dentistry) a technique for repairing a tooth; resinous material is applied to the surface of the tooth where it adheres to the tooths enamel
- intentionally matched; "curtains and walls were color coordinated" (同)co-ordinated, matching
- being dexterous in the use of more than one set of muscle movements; "she was usually good with her hands and well coordinated"- Mary McCarthy (同)co-ordinated
- operating as a unit; "a unified utility system"; "a coordinated program" (同)co-ordinated, interconnected, unified
- United States civil rights leader who was elected to the legislature in Georgia but was barred from taking his seat because he opposed the Vietnam War (born 1940) (同)Julian Bond
- British secret operative 007 in novels by Ian Fleming (同)James Bond
PrepTutorEJDIC
- 〈C〉『縛る物』 / 《通例複数形で》『束縛』,拘束,かせ / 《しばしば複数形で》(血縁,義理などの)『きずな』,縁 / 〈C〉契約 / 〈C〉『証書』,証文;『債券』,公債 / 〈U〉(石・れんがなどの)つなぎ方,組積み / 〈U〉保税倉庫入り / 〈U〉接着,接合;接着剤,接合剤 / 〈品物〉'を'担保とする / …‘の'保証人となる / (債券などを発行して)…‘の'支払いを保証する / …'を'つなぐ,結ぶ(bind together) / つながる
- 対等の,等位の;(…と)同等の,同位の《+『with』+『名』》 / 同等の人(人物) / (数学の)座標 / 《複数形で》コーディネート(色やデザインを組合せた装い・家具) / 〈各部分〉'を'調和させる / 調和して動く
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2014/04/02 15:38:40」(JST)
[Wiki en表示]
A dipolar bond,[1] also known as a dative covalent bond[2] or coordinate bond[3] is a kind of 2-center, 2-electron covalent bond in which the two electrons derive from the same atom.
Examples[edit]
Adduct of ammonia and boron trifluoride
The term dipolar bond is used in organic chemistry for compounds such as amine oxides for which the electronic structure can be described in terms of the basic amine donating two electrons to an oxygen atom.
- R
3N → O
The arrow → indicates that both electrons in the bond originate from the amine moiety. In a standard covalent bond each atom contributes one electron. Therefore, an alternative description is that the amine gives away one electron to the oxygen atom, which is then used, with the remaining unpaired electron on the nitrogen atom, to form a standard covalent bond. The process of transferring the electron from nitrogen to oxygen creates formal charges, so the electronic structure may also be depicted as
- R
3N+
O−
Hexamminecobalt(III) chloride
This electronic structure has an electric dipole, hence the name dipolar bond. In reality the atoms carry fractional charges; the more electronegative atom of the two involved in the bond will carry a fractional negative charge.
An example of a dative covalent bond is provided by the interaction between a molecule of ammonia, a Lewis base with a lone pair of electrons on the nitrogen atom, and boron trifluoride, a Lewis acid by virtue of the boron atom having an incomplete octet of electrons. In forming the adduct, the boron atom attains an octet configuration.
The electronic structure of a coordination complex can be described in terms of the set of ligands each donating a pair of electrons to a metal centre. For example, in Hexamminecobalt(III) chloride, each ammonia ligand donates its lone pair of electrons to the cobalt(III) ion. In this case, the bonds formed are described as coordinate bonds.
In all cases the bond is a covalent bond. The prefix dipolar, dative or coordinate merely serves to indicate the origin of the electrons used in creating the bond.
References[edit]
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "dipolar bond".
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "dative bond".
- ^ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "coordinate bond".
Chemical bonds
|
|
Intramolecular
("strong") |
Covalent
bonds |
By symmetry |
- Sigma (σ)
- Pi (π)
- Delta (δ)
- Phi (φ)
|
|
By multiplicity |
- 1 (single)
- 2 (double)
- 3 (triple)
- 4 (quadruple)
- 5 (quintuple)
- 6 (sextuple)
|
|
Miscellaneous |
- Agostic bond
- Bent bond
- Dipolar bond
- Pi backbond
- Hapticity
- Conjugation
- Hyperconjugation
- Antibonding
|
|
Resonant
bonds |
- Electron-deficient
- Hypercoordination
- Aromaticity
|
|
|
Metallic bonds |
|
|
Ionic bonding |
|
|
|
Intermolecular
("weak") |
van der Waals
forces |
|
|
Hydrogen
bond |
- Low-barrier
- Resonance-assisted
- Symmetric
- Dihydrogen bonds
|
|
Other
noncovalent |
- Mechanical bond
- Halogen bond
- Aurophilicity
- Intercalation
- Stacking
- Cation–pi bond
- Anion–pi bond
- Salt bridge
|
|
|
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Related Links
- coordinate bond co·or·di·nate bond (kō-ôr'dn-ĭt, -āt') n. A covalent chemical bond between two atoms that is produced when one atom shares a pair of electrons with another atom lacking such a pair. Also called semipolar ...
- coordinate bond noun The definition of a coordinate bond is a chemical bond between two atoms when one of the atoms shares a pair of electrons. An example of a coordinate bond is the relationship between hydrogen chloride ...
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[★]
- 関
- associate、bind、binding、bonding、combine、conjoin、conjugate、conjugation、conjunction、connect、connection、couple、dock、engage、engagement、join、ligate、linkage、symphysial、union
[★]
- 関
- co-ordinate、co-ordinately、coordinately、coordination、harmonization、harmonize、synchronous、synchronously