catena-Poly[[diaqua-nickel(II)]-bis-(μ-2-{[5-(pyridin-4-yl)-1,3,4-oxadiazol-2-yl]sulfan-yl}acetato)].

In the title compound, [Ni(C(9)H(6)N(3)O(3)S)(2)(H(2)O)(2)](n), the Ni(II) atom, located on an inversion center, is ligated in an octa-hedral geometry by two carboxyl-ate O atoms from two 2-{[5-(pyridin-4-yl)-1,3,4-oxadiazol-2-yl]sulfan-yl}acetate (L) ligands and two O atoms from water mol-ecules in the equatorial plane, and two pyridine N atoms from other two L ligands at the apical sites. Two L ligands bridge pairs of metal atoms in an anti-parallel manner, forming centrosymmetric dinuclear quasi-recta-ngular units which are linked into infinite double-stranded chains parallel to [100]. O-H⋯O hydrogen bonds between the coordinating water mol-ecules and the carboxyl-ate groups of the L ligand as well as interchain S⋯N inter-actions [2.

1,3-Bis{[5-(pyridin-2-yl)-1,3,4-oxadiazol-2-yl]sulfan-yl}propan-2-one.

In the distorted W-shaped mol-ecule of the title compound, C(17)H(12)N(6)O(3)S(2), a twofold axis passes through the carbonyl group. The mol-ecules stack in the crystal through π-π inter-actions [centroid-centroid distance = 3.883 Å] and weak C-H⋯N hydrogen-bonding inter-actions, forming a three-dimensional architecture.

[The management of the stoma in endoscopic dacryocystorhinostomy].

Objective: To explore the better management of the stoma in endoscopic dacryocystorhinostomy.

Method: To review the 102 chronic dacryocystitis patients (109 eyes), who underwent the endoscopic dacryocystorhinostomy surgery with silver clips used to maintain the stoma. They were given combined therapy after the surgery, and were followed up for a period range from 3-73 months.