Anal fistulotomy with one-stage shaped skin grafting for intersphincter anal fistulas: study protocol on a multicentre randomised controlled trial.

Background: Anal fistulas are mainly treated via surgery. They can be difficult to treat without surgical intervention. Numerous procedures, such as fistulectomy and fistulotomy, are performed to treat anal fistulas and achieve good effects.

Comprehensively understanding the steric hindrance effect on the coordination sphere of Pb ions and photophysical nature of two luminescent Pb(ii)-coordination polymers.

New luminescent Pb(ii)-coordination polymers (Pb(ii)-CPs), [Pb(2-anc)] (1) and [Pb(3-qlc)(HO)] (2) (2-anc = 2-aminonicotinate, 3-qlc = 3-quinolinecarboxylate), were synthesized by a solvothermal reaction and characterized using microanalysis, IR spectrometry and thermogravimetric analysis. Single crystal structure analysis revealed that the Pb ion displays a hemi-directed coordination geometry in 1 and a holo-directed coordination geometry in 2. The difference between the coordination spheres of 1 and 2 is related to the steric hindrance effect of the ligands.

Metal ion coordination enhancing quantum efficiency of ligand phosphorescence in a double-stranded helical chain coordination polymer of Pb with nicotinic acid.

A new 1D phosphorescence coordination polymer (CP) [Pb2O(C6H4NO2)2]n (1; C6H4NO2 = nicotinate) was synthesized by a solvothermal reaction and PbO was used as a Pb(ii) source instead of traditional Pb(ii) salts. This remarkably thermal-stable CP crystallizes in the space group I41/a. In the crystal structure of 1, two different Pb(ii) ions show a five-coordinated and hemidirected coordination geometry, two nonequivalent nicotinate ligands link to Pb(ii) ions in μ2-η1:η1 and μ4-η2:η2 modes, and the hemidirected coordination polyhedra of Pb(ii) form a helical lead-oxide chain via an edge-sharing fashion along the c-axis.

Unique (3,12)-connected porous lanthanide-organic frameworks based on Ln(4)O(4) clusters: synthesis, crystal structures, luminescence, and magnetism.

Three porous lanthanide-organic frameworks, [Ln(4)(OH)(4)(3-SBA)(4)(H(2)O)(4)].nH(2)O [Ln = Eu(III) (1), n = 10; Gd(III) (2), n = 10; Tb(III) (3), n = 8; 3-SBA = 3-sulfobenzoate], have been prepared by a hydrothermal synthesis method. They are isomorphous and crystallize in a tetragonal system with space group P 42(1)c.