We consider the cooperative decay of incoherently pumped atoms in a disordered medium, where light undergoes multiple scattering. It is shown that the cooperation number, which determines the duration and amplitude of superfluorescent impulses, is given by the number of atoms along a diffusive trajectory of the light propagating through the medium. We also consider the problem of reflection of ...

The title Schiff base, C23H27ClN2O adopts the phenol-imine tautomeric form, with an intra-molecular O-H⋯N hydrogen bond, which generates an S(6) ring motif. Three C atoms of the heterocyclic moiety of the hexa-hydro-pyrido-quinoline unit, as well as the two methyl groups bonded to one of these C atoms, are disordered over two set of sites, with anoccupancy ratio of 0.740 (4):0.260 (4).

The structure of the title compound, [Ni(C13H9FNO)2(C5H5N)2], consists of an Ni(II) atom on a crystallographic center of symmetry, octa-hedrally bonded through both the N and O atoms to two 2-[(2-fluoro-phen-yl)imino-meth-yl]phenolate (L) ligands, as well as two pyridine ligands. The F atoms of L are disordered over two positions related by a 180° rotation of the fluoro-phenyl group around its ...

The title compound, [Sn(CH(3))(3)(C(6)H(5)O(2)S)](n), forms an infinite chain structure parallel to [100]. There are two mol-ecules of the complex in the asymmetric unit. The geometry of the Sn atoms in both mol-ecules is distorted trigonal-bipyramidal. The S and C atoms of the thio-phene rings in both mol-ecules are disordered over two sites with site-occupancy factors 0.799 (9)/0.201 (9) and ...

The imidazopyridine ring system in the title compound, C(9)H(8)BrN(3)S, is almost planar [r.m.s. deviation of the C and N atoms = 0.007 (1) Å]. The S and methyl-ene C atoms connected to the five-membered ring lie within this plane. The remaining two methyl-ene groups of the thia-zine ring are disordered over two sets of sites in a 0.817 (5):0.183 (5) ratio.

In the title compound, [Co(C(10)H(12)NO(2))(3)]·H(2)O, the Co(III) ion is coordinated by three O atoms and three N atoms from three bidentate 2-eth-oxy-6-(methyl-imino-meth-yl)phenolate ligands in a slightly distorted octa-hedral environment. The water mol-ecule connects two ligands by O-H⋯O hydrogen bonds. One terminal methyl group is disordered over two positions, with site-occupancy factors ...

The title compound, [Sn(C(4)H(9))(2)(C(5)H(8)NS(2))Cl], contains two mol-ecules in the asymmetric unit, with similar conformations. In both mol-ecules, the Sn atom adopts a distorted trigonal-bipyramidal geometry arising from two C atoms, one Cl atom and two S atoms from the bidentate dithio-carbamate ligand, with one Sn-S bond much longer than the other. One C atom of the pyrrolidine ring is d...