The effect benzene, toluene, and o -xylene vapors have on the optical properties of a photonic crystal sensor matrix and its components is studied by UV–visible diffuse reflectance spectroscopy. The effect the material of the photon assembly substrate has on the band gap parameters is considered. The possibility of visually detecting vapors of saturated nonpolar organic solvents using a photonic crystal–based sensor is demonstrated. A mechanism is proposed for the analytic response of the sensor.

Parameters of the local coordination of Co 2+ and Ni 2+ cations in polymer matrices are determined by XAFS spectroscopy at the K edges of the corresponding elements. Ion-exchange complexes of Ni 2+ and polymethacrylate, low-molecular acrylamide complexes [ M (CH 2 =CHC(O)NH 2 ) 6 ](NO 3 ) 2 ( M = Co or Ni), and products of their thermal polymerization are investigated. The final results are in agreement with the octahedral coordination of M atoms (average distances, 2.10–2.11 (Co-O) and 2.05–2.06 Å (Ni-O).

A new simple method of synthesis of heteroligand complexes [Ln(Dalkdtc) 3 Phen] (Ln = Eu or Er; Dalkdtc is the dialkyldithiocarbamate ion, Phen is o -phenanthroline) in an aqueous solution is described; the possibility of using the complexes as initial reagents for the synthesis of rare-earth sulfides is shown.