The geometry of a molecule of BF3 is described as trigonal planar. The D3h symmetry conforms with the prediction of VSEPR theory. Although featuring three polar covalent bonds, the molecule has no dipole moment by virtue of its high symmetry. Although isoelectronic with carbonate, CO32−, BF3 is commonly referred to as " electron deficient," a description that is reinforced by its exothermic reactivity toward Lewis bases.
In the boron trihalides, BX3, the length of the B-F bonds (1.30 Å) is shorter than would be expected for single bonds, and this shortness may indicate stronger B-X π-bonding in the fluoride. A facile explanation invokes the symmetry-allowed overlap of a p orbital on the boron atom with the in-phase combination of the three similarly oriented p orbitals on fluorine atoms.
On a laboratory scale, BF3 is produced by the thermal decomposition of diazonium salts:
The criteria for evaluating the relative strength of π-bonding are not clear, however.
One of the suggestion is that F atom is small compared to I atom, the lone pair electron in pz of F readily and easily donated and overlapped to empty pz orbital of boron.
As a result, the back donation of F is greater than that of I.
In an alternative explanation, the low Lewis acidity for BF3 is attributed to the relative weakness of the bond in the adducts F3B-L.
The heavier trihalides do not undergo analogous reactions, possibly the lower stability of the tetrahedral ions BX4- (X = Cl, Br). Because of the high acidity of fluoroboric acid, the fluoroborate ion can be used to isolate particularly electrophilic cations, such as diazonium ions, that are otherwise difficult to isolate as solids.
Electrical characterization of the boron trifluoride doped poly(3-aminoacetophenone)/ p-Si junction.(Report)
May 01, 2010; INTRODUCTION Organic semiconductor materials consist of a new class of electronic materials which show processing and performance...
Wipo Publishes Patent of Idemitsu Kosan, Sumihiro Oda, Masashi Machida, Hiroki Sekiguchi, Yukio Yoshida and Toshiyuki Tsubouchi for "Recovery Method and Recycling Method for Boron Trifluoride Complex" (Japanese Inventors)
Sep 09, 2013; GENEVA, Sept. 9 -- Publication No. WO/2013/129662 was published on Sept. 6.Title of the invention: "RECOVERY METHOD AND RECYCLING...
Wipo Publishes Patent of Basf Schweiz and Basf for "Boron Trifluoride Catalyst Complex and Method for Producing Highly Reactive Isobutene Homopolymers" (German Inventors)
Aug 26, 2013; GENEVA, Aug. 26 -- Publication No. WO/2013/120859 was published on Aug. 22.Title of the invention: "BORON TRIFLUORIDE CATALYST...
Wipo Publishes Patent of Halliburton Energy Services for "Treatment Fluids Containing a Boron Trifluoride Complex and Methods for Use Thereof" (American Inventor)
Aug 09, 2013; GENEVA, Aug. 9 -- Publication No. WO/2013/115981 was published on Aug. 8.Title of the invention: "TREATMENT FLUIDS CONTAINING A...