Received 27 October 2012
aDepartment of Chemistry, Popes College, Sawyerpuram 628 251, Tamilnadu, India,bDepartment of Physics, Sethupathy Government Arts College, Ramanathapuram 623 502, Tamilnadu, India, and cInstitut für Organische Chemie, Universität Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
Correspondence e-mail: email@example.com
In the title hydrate, C13H11N3O·H2O, the benzotriazole ring system is planar (r.m.s. deviation = 0.007 Å) and is almost orthogonal to the phenyl ring to which it is linked by a methylene group, forming a dihedral angle of 81.87 (15)°. In the crystal, molecules are linked into chains along  by O-HO hydrogen bonds. The chains are consolidated into a three-dimensional architecture by C-HO, C-H and - [centroid-centroid distance between the five- and six-membered rings of the benzotriazole ring system = 3.595 (3) Å] interactions.
For the biological activity of benzotriazole derivatives, see: Kopanska et al. (2005); Sarala et al. (2007). For their applications, see: Kopec et al. (2008); Krawczyk & Gdaniec (2005); Smith et al. (2001); Sha et al. (1996). For a related structure, see: Selvarathy Grace et al. (2012).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK5165 ).
Bruker (2008). APEX2 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.
Kopanska, K., Najda, A., Zebrowska, J., Chomicz, L., Piekarczyk, J., Myjak, P. & Bretner, M. (2005). Bioorg. Med. Chem. 13, 3601-3616.
Kopec, E. A., Zwolska, Z. & Kazimierczuk, A. O. Z. (2008). Acta Pol. Pharm. Drug Res. 65, 435-439.
Krawczyk, S. & Gdaniec, M. (2005). Acta Cryst. E61, o2967-o2969.
Sarala, G., Swamy, S. N., Prabhuswamy, B., Andalwar, S. M., Prasad, J. S. & Rangappa, K. S. (2007). Anal. Sci. 23, 25-26.
Selvarathy Grace, P., Jebas, S. R., Ravindran Durai Nayagam, B. & Schollmeyer, D. (2012). Acta Cryst. E68, o1132.
Sha, G., Wang, W. & Ren, T. (1996). Mocha Xuebao, 16, 344-350.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Smith, G., Bottle, S. E., Reid, D. A., Schweinsberg, D. P. & Bott, R. C. (2001). Acta Cryst. E57, o531-o532.
Spek, A. L. (2009). Acta Cryst. D65, 148-155.