Two P21/n monoclinic phases of fluorene-4-carboxylic acid at 296 K

Allison J. Amonette; A.C. Blackburn

doi:10.1107/S0108270195016179

Two P2₁/n monoclinic phases of fluorene-4-carboxylic acid at 296 K

Allison J. Amonette, A.C. Blackburn

Biochemistry, Chemistry & Physics

Research output: Contribution to journal › Article › peer-review

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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	English
Pages (from-to)	1482-1486
Number of pages	5
Journal	Acta Crystallographica Section C: Crystal Structure Communications
Volume	52
Issue number	6
DOIs	https://doi.org/10.1107/S0108270195016179
State	Published - Jun 15 1996

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General Biochemistry, Genetics and Molecular Biology

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title = "Two P21/n monoclinic phases of fluorene-4-carboxylic acid at 296 K",

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",

month = jun,

day = "15",

doi = "10.1107/S0108270195016179",

language = "English",

volume = "52",

pages = "1482--1486",

journal = "Acta Crystallographica Section C: Crystal Structure Communications",

issn = "0108-2701",

publisher = "International Union of Crystallography",

number = "6",

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TY - JOUR

T1 - Two P21/n monoclinic phases of fluorene-4-carboxylic acid at 296 K

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 - 1996/6/15

Y1 - 1996/6/15

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://www.scopus.com/pages/publications/3142645047

U2 - 10.1107/S0108270195016179

DO - 10.1107/S0108270195016179

M3 - Article

SN - 0108-2701

VL - 52

SP - 1482

EP - 1486

JO - Acta Crystallographica Section C: Crystal Structure Communications

JF - Acta Crystallographica Section C: Crystal Structure Communications

IS - 6

ER -

Two P2₁/n monoclinic phases of fluorene-4-carboxylic acid at 296 K

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