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A number of publications containing structural data, characteristics of nonlinear optical properties of pure and doped crystals of potassium titanyl phosphate (KTP) family have been reviewed to analyze the structural and symmetry conditionality of nonlinear optical properties of these crystals. The pseudosymmetric features of KTP-type crystals with respect to inversion are investigated. Specifically, pseudoinversion distribution maps are calculated; pseudoinversion extrema and coordinates of pseudoinversion centres are found; and the distributions of pure and doped KTP-type structures and their individual atomic sublattices over the degree of pseudoinversion are analyzed. A correlation between the characteristics of nonlinear optical properties of a number of crystals belonging to the KTP family and the degree of pseudoinversion of their atomic structures is demonstrated.

This work is a part of a series of investigations devoted to the study of the relationship between nonlinear optical properties and pseudosymmetric features of some groups of crystal compounds [A. P. Gazhulina and M. O. Marychev, Cryst. Struct. Theory Appl. 2, 106 (2013). doi.org/10.4236/csta.2013.23015 ; A. P. Gazhulina and M. O. Marychev, J. Alloys Compd. 623, 413 (2015). doi.org/10.1016/j.jallcom.2014.11.028 ; A. P. Gazhulina and M. O. Marychev, J. Solid State Chem. 239, 170 (2016). doi.org/10.1016/j.jssc.2016.04.034 ]. Crystals of the wurtzite ([Formula: see text]4) structural type (45 crystals) have been considered. In the framework of density functional theory, the structural, electronic, linear and nonlinear optical properties were investigated using the full-potential linearized augment plane wave (FP-LAPW) method. The obtained results are compared to available experimental and computational data. Diagrams “Second-order Nonlinear Susceptibility–Degree of Pseudoinversion” at 1.064 and 0.634 [Formula: see text]m wavelengths were constructed.

With an idea to explore the unique structure of the lanthanide 15‐MC‐5 metallacrowns, the water‐soluble Cu(II)‐Ce(III) aqua‐complexes, bearing aminohydroximate (glycine‐ and α‐phenylalanine) ligands have been synthesized and tested for preparing the target copper and cerium oxides under hydrothermal conditions. These Polynuclear heterometallic metallamacrocyclic complexes represent the unique single‐source precursors for a facile one‐pot, surfactant‐ and template‐free synthesis of nano‐ and mesocrystals with the intrinsic features of rough surfaces, high porosity, single‐crystalline structures and complex morphology. The structure, morphology, and composition of as‐prepared samples have been characterized by means of powder X‐ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy‐dispersive spectroscopy (EDS). Our results suggest a very simple chemical route to guide the formation of beautiful self‐assembled nanostructures.

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