Alpha and beta Phases of 4-Aminoquinoline-2-carboxylic Acid Monohydrate

<div class="line" id="line-5"> The structures of two phases of the title compound, C <span style="font-size: 9px;"> 10 </span> H <span style="font-size: 9px;"> 8 </span> N <span style="font-size: 9px;"> 2 </span> O <span style="font-size: 9px;"> 2 </span> .H <span style="font-size: 9px;"> 2 </span> O, are reported. While the organic molecule has very nearly the same molecular geometry in the two phases, the hydrogen-bonding patterns are quite different. In each case, however, a three-dimensional network of hydrogen bonds is formed. In the&nbsp; <img src="http://scripts.iucr.org/logos/entities/alpha_rmgif.gif"/> &nbsp;phase, six N-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonds have donor-acceptor distances ranging from 2.681&nbsp;(2) to 3.206&nbsp;(2)&nbsp;&Aring;, while three O-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonds range from 2.837&nbsp;(2) to 3.173&nbsp;(2)&nbsp;&Aring;, and in the&nbsp; <img src="http://scripts.iucr.org/logos/entities/beta_rmgif.gif"/> &nbsp;phase, four N-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonds range from 2.668&nbsp;(2) to 3.038&nbsp;(2)&nbsp;&Aring;, while two O-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonds are 2.951&nbsp;(3) and 2.959&nbsp;(3)&nbsp;&Aring; in length.</div><div class="line" id="line-29"> <br/></div>