2 research outputs found
Polymorphism of 2‑Adamantanone
The
polymorphism of 2-adamantanone (C<sub>10</sub>H<sub>14</sub>O) has
been investigated by means of X-ray diffraction and high-pressure
thermal analysis. The intricate behavior of the low-temperature crystalline
phases has been disentangled. The stable phase has been found to be
orthorhombic (<i>Cmc2</i><sub>1</sub>, <i>Z</i> = 4), fully ordered, with lattice parameters <i>a</i> =
6.8884(18) Ã…, <i>b</i> = 10.830(3) Ã…, <i>c</i> = 10.658(3) Ã…, and <i>V</i>/<i>Z</i> = 198.8(1) Ã…<sup>3</sup>. The metastable phase was determined
to be monoclinic (<i>P</i>2<sub>1</sub>/<i>c</i>, <i>Z</i> = 4) with lattice parameters <i>a</i> = 6.5920(17) Å, <i>b</i> = 11.118(3) Å, <i>c</i> = 12.589(3) Å, β= 118.869(11) <sup>o</sup>,
and <i>V</i>/<i>Z</i> = 202.0(1) Å<sup>3</sup>. The pressure–temperature phase diagram irrefutably shows
the stability relation between both phases and, accordingly, the long-time
unknown polymorphic behavior is now revealed and gives coherent physical
explanation of the literature published so far
Polymorphism of 2‑Adamantanone
The
polymorphism of 2-adamantanone (C<sub>10</sub>H<sub>14</sub>O) has
been investigated by means of X-ray diffraction and high-pressure
thermal analysis. The intricate behavior of the low-temperature crystalline
phases has been disentangled. The stable phase has been found to be
orthorhombic (<i>Cmc2</i><sub>1</sub>, <i>Z</i> = 4), fully ordered, with lattice parameters <i>a</i> =
6.8884(18) Ã…, <i>b</i> = 10.830(3) Ã…, <i>c</i> = 10.658(3) Ã…, and <i>V</i>/<i>Z</i> = 198.8(1) Ã…<sup>3</sup>. The metastable phase was determined
to be monoclinic (<i>P</i>2<sub>1</sub>/<i>c</i>, <i>Z</i> = 4) with lattice parameters <i>a</i> = 6.5920(17) Å, <i>b</i> = 11.118(3) Å, <i>c</i> = 12.589(3) Å, β= 118.869(11) <sup>o</sup>,
and <i>V</i>/<i>Z</i> = 202.0(1) Å<sup>3</sup>. The pressure–temperature phase diagram irrefutably shows
the stability relation between both phases and, accordingly, the long-time
unknown polymorphic behavior is now revealed and gives coherent physical
explanation of the literature published so far