Different from conventional 2D materials, the (C4H9NH3 2PbBr4 sheet exhibited an unusual lattice constant expansion, which led to a slightly shifted band edge emission relative to the bulk counterpart.
The strong correlation clearly seen between the CH triplet (4.25 ppm) and the CH2 doublet (3.09 ppm) indicates that despite the unusual coupling constants obtained from the 1H NMR, the nuclei in question are spin coupled.
There is nothing unusual about her constant texting.
For instance, this polymer is known for its outstanding electroactive properties and an unusual high dielectric constant with respect to other polymers [4].
One of their unusual practices was a constant concern for his "safety," as if leaving the Potala Palace at all was a constant threat on his life.
Huston's rapt, crooked Sandy was the most unusual character in "The Constant Gardener," and, in Hillcoat's movie, he and Ray Winstone — outlaw and lawman, if you can tell the difference — conspire to incarnate the heavy, bullying souls who scrapped for possession of a new territory.
The 2016 presidential campaign is an unusual one, full of constant controversy and races that are still competitive on both sides (despite the comments of both front-runners).
The sound of Russian-made helicopters, once constant, is now unusual.
"It doesn't pigeonhole us," Joanmarie Gonzalez said, adding that she and her sister, both residents of Pelham Manor, were on a constant search for unusual merchandise wherever they go, from gift and craft shows across the country to local jaunts to vacation destinations.
The unusual ratio of the equilibrium constants was explained by lower basicity of π*-dianion compare with other anions.
