bipyramidal


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bipyramidal

adjective Consisting of 2 pyramids placed base to base; having a pyramid at each of the extremities.
References in periodicals archive ?
The newly synthesized low-dimensional network is unique in the sense that the potassium metal ion is forming seven bonds through coordination with the four sulfide ions of thiol moieties of four different thiadiazole rings, one bond with nitrogen atom of azine nitrogens and two bonds with oxygen atoms of two hydroxyl ions observing a distorted pentagonal bipyramidal geometry.
Although crystal number varied from isolate to isolate, all showed the presence of bipyramidal, cuboidal, round coleopteran specific crystals.
Symmetry between S and R blocks symmetry breaks due to trigonal bipyramidal 2b site.
Crans, "Vanadium-phosphatase complexes: phosphatase inhibitors favor the trigonal bipyramidal transition state geometries," Coordination Chemistry Reviews, vol.
without a spicule) consisted of euhedral prismatic bipyramidal crystals (Figure 23, right).
Based on the morphology, we have distinguished two groups of zircon grains: (1) euhedral elongated bipyramidal prisms and (2) stubby prisms.
Lithium organometailic reagent.--Both the monosubstituted and disubstituted transition states, 2 and 4 respectively, for the ethynyl substitution of fluorine with a lithium counter cation displayed unconventional geometry at the trigonal bipyramidal boron center.
Gray, "Plasmonic interactions and optical forces between au bipyramidal nanoparticle dimers," The Journal of Physical Chemistry A, Vol.
The pigment was accidentally discovered when some manganese compounds came out of a 2,000 degree Fahrenheit oven transformed into a beautiful blue, which researchers later determined was due to an unusual "trigonal bipyramidal coordination" of their molecules that changed when exposed to extreme heat.
NUMBER OF 1 EXAMPLES MOLECULAR BOND ANGLE EQUIVALENT SHAPE BOND 2 [CO.sub.2] linear 180 [degrees] = [cos.sub.-1] (-1/1) 3 [NO.sup.3], trigonal 120 [degrees] = [cos.sub.-1] [BF.sup.3] planar (-1/2) 4 [CH.sup.4], tetrahedral 109.471 = [cos.sub.-1] [NH.sup.4+] [degrees] (-1/3) 5 [PF.sup.5] trigonal 90[degrees] = [cos.sub.-1] bipyramidal and 120 (-1/4) [degrees] 6 [SF.sup.6] octahedral 90 [degrees] = [cos.sub.-1] (-1/5) Table 1: the idealized equilibrium bond angles in molecules with a central atom surrounded by 2, 3, 4, 5, and 6 equivalent bonds.
Charcot-Leyden crystals (degenerated eosinophils) are present as long, needle-shaped, or bipyramidal eosinophilic crystals (figure 2).