|CDX Constant Name:||kCDXProp_Bond_Order|
|CDX Constant Value:||0x0600|
|Property of objects:||kCDXObj_Bond|
|First written/read in:||ChemDraw 4.0|
The order of a bond object.
Dative and Ionic bonds are specified with the Bond_Begin as the positive end (e.g. the N in pyridine N-oxide). Hydrogen bonds are specified with Bond_Begin as the hydrogen. Three center bonds are specified with two Bond objects, each with Bond_Begin as the center atom.
Bond order values may be combined. For example, a value of 3 would represent a "single or double" bond, which is useful for substructure queries.
Ionic, hydrogen, and three-center bonds are not currently supported by ChemDraw, but are defined for future compatibility.
This is a bit-encoded property. The values shown in the following list may be combined:
|0xFFFF||Unspecified order (omitted entirely in CDXML)|
|0x0008||4||Quadruple bond (used for some inorganic complexes)|
|0x0010||5||Quintuple bond (used for some inorganic complexes)|
|0x0020||6||Hextuple bond (used for some inorganic complexes)|
|0x0040||0.5||Bond of order one-half|
|0x0080||1.5||Bond of order one and one-half (an aromatic bond)|
|0x0100||2.5||Bond of order two and one-half (in benzyne, for example)|
|0x0200||3.5||Bond of order three and one-half (used for some inorganic complexes)|
|0x0400||4.5||Bond of order four and one-half (used for some inorganic complexes)|
|0x0800||5.5||Bond of order five and one-half (used for some inorganic complexes)|
|0x1000||dative||Dative bond, from the "begin" atom to the "end" atom|
|0x8000||threecenter||Three-center-bond (in boranes, for example)|
If this property is absent:
The bond is treated as a single bond.