Two P21/n Monoclinic Phases of Fluorene-4-carboxylic Acid at 296K

Allison J. Amonette; A.C. Blackburn

doi:10.1107/S0108270195016179

Two P21/n Monoclinic Phases of Fluorene-4-carboxylic Acid at 296K

Allison J. Amonette, A.C. Blackburn

Emeriti, Retired, & In Memoriam (COSM)

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Abstract

<div class="line" id="line-5"> The structures of two phases of fluorene-4-carboxylic acid, C <span style="font-size: 9px;"> 14 </span> H <span style="font-size: 9px;"> 10 </span> O <span style="font-size: 9px;"> 2 </span> , from room-temperature growths have been determined. In the  <img src="http://scripts.iucr.org/logos/entities/alpha_rmgif.gif"/>  phase, O-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonding occurs  <i> via </i>  cyclic dimers about a center of symmetry; in the  <img src="http://scripts.iucr.org/logos/entities/beta_rmgif.gif"/>  phase, cyclic dimers with O-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonds are formed between two crystallographically inequivalent molecules and do not involve a center of symmetry, though centers of symmetry are present in the crystal. The present evidence strongly suggests that the  <img src="http://scripts.iucr.org/logos/entities/beta_rmgif.gif"/>  phase is metastable with respect to the  <img src="http://scripts.iucr.org/logos/entities/alpha_rmgif.gif"/>  phase at room temperature, but the regions of stability have not been determined.</div><div class="line" id="line-27"> <br/></div>

Original language	American English
Journal	Acta Crystallographica Section C: Structural Chemistry
Volume	52
DOIs	https://doi.org/10.1107/S0108270195016179
State	Published - 1996

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Physical Sciences and Mathematics
Chemistry

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@article{db8b947070994bf7add217dbf06e52b7,

title = "Two P21/n Monoclinic Phases of Fluorene-4-carboxylic Acid at 296K",

abstract = " The structures of two phases of fluorene-4-carboxylic acid, C 14 H 10 O 2 , from room-temperature growths have been determined. In the   phase, O-H O hydrogen bonding occurs  via  cyclic dimers about a center of symmetry; in the   phase, cyclic dimers with O-H O hydrogen bonds are formed between two crystallographically inequivalent molecules and do not involve a center of symmetry, though centers of symmetry are present in the crystal. The present evidence strongly suggests that the   phase is metastable with respect to the   phase at room temperature, but the regions of stability have not been determined. ",

author = "Amonette, {Allison J.} and A.C. Blackburn",

note = "Crystallographic Information File (CIF) Contains datablocks global, a, b Structure factor file (SHELXL table format) Supplementary material Structure factor file (SHELXL table format) Supplementary material",

year = "1996",

doi = "10.1107/S0108270195016179",

language = "American English",

volume = "52",

journal = "Acta Crystallographica Section C: Structural Chemistry",

issn = "2053-2296",

publisher = "John Wiley & Sons Inc.",

}

TY - JOUR

T1 - Two P21/n Monoclinic Phases of Fluorene-4-carboxylic Acid at 296K

AU - Amonette, Allison J.

AU - Blackburn, A.C.

N1 - Crystallographic Information File (CIF) Contains datablocks global, a, b Structure factor file (SHELXL table format) Supplementary material Structure factor file (SHELXL table format) Supplementary material

PY - 1996

Y1 - 1996

N2 - The structures of two phases of fluorene-4-carboxylic acid, C 14 H 10 O 2 , from room-temperature growths have been determined. In the   phase, O-H O hydrogen bonding occurs  via  cyclic dimers about a center of symmetry; in the   phase, cyclic dimers with O-H O hydrogen bonds are formed between two crystallographically inequivalent molecules and do not involve a center of symmetry, though centers of symmetry are present in the crystal. The present evidence strongly suggests that the   phase is metastable with respect to the   phase at room temperature, but the regions of stability have not been determined.

AB - The structures of two phases of fluorene-4-carboxylic acid, C 14 H 10 O 2 , from room-temperature growths have been determined. In the   phase, O-H O hydrogen bonding occurs  via  cyclic dimers about a center of symmetry; in the   phase, cyclic dimers with O-H O hydrogen bonds are formed between two crystallographically inequivalent molecules and do not involve a center of symmetry, though centers of symmetry are present in the crystal. The present evidence strongly suggests that the   phase is metastable with respect to the   phase at room temperature, but the regions of stability have not been determined.

UR - https://doi.org/10.1107/S0108270195016179

U2 - 10.1107/S0108270195016179

DO - 10.1107/S0108270195016179

M3 - Article

SN - 2053-2296

VL - 52

JO - Acta Crystallographica Section C: Structural Chemistry

JF - Acta Crystallographica Section C: Structural Chemistry

ER -

Two P21/n Monoclinic Phases of Fluorene-4-carboxylic Acid at 296K

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