| Autor: |
Garcia-Grajeda BA; Facultad de Ingenieria Mochis, Universidad Autónoma de Sinaloa, Fuente Poseidón y Prol. A. Flores S/N, CP 81223, C.U. Los Mochis, Sinaloa, México., Höpfl H; Centro de Graduados e Investigación en Química, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, CP 62210, Cuernavaca, Morelos, México., Guerrero-Alvarez JA; Centro de Graduados e Investigación en Química, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, CP 62210, Cuernavaca, Morelos, México., Campos-Gaxiola JJ; Facultad de Ingenieria Mochis, Universidad Autónoma de Sinaloa, Fuente Poseidón y Prol. A. Flores S/N, CP 81223, C.U. Los Mochis, Sinaloa, México., Cruz-Enríquez A; Facultad de Ingenieria Mochis, Universidad Autónoma de Sinaloa, Fuente Poseidón y Prol. A. Flores S/N, CP 81223, C.U. Los Mochis, Sinaloa, México. |
| Abstrakt: |
The asymmetric unit of the title compound, C12H10BNO5·0.67H2O, contains three independent pyridinylboronic acid esters adopting zwitterionic forms and two water mol-ecules. The six-membered heterocyclic rings in the boronic esters have half-chair conformations and the deviations of the B atoms from the boronate mean planes range from 0.456 (3) to 0.657 (3) Å. All of the B atoms have tetra-hedral coordination environments, with B-O and B-C bond lengths of 1.446 (4)-1.539 (3) and 1.590 (5)-1.609 (5) Å, respectively. In the crystal, the ester and water mol-ecules are linked into a three-dimensional network by a large number of O-H⋯O, N-H⋯O and C-H⋯O hydrogen bonds. The crystal packing is further accomplished by π-π inter-actions, with centroid-centroid distances of 3.621 (4)-3.787 (4) Å. |
