“…It has been already proven that the abovementioned properties allow for significant values of first molecular hyperpolarizability β [ 10 , 11 ]. Bis(8-Hydroxyquinoline) zinc—Znq 2 , bis(8-Hydroxyquinoline) copper (II)—Cuq 2 , and tris(8-Hydroxyquinoline) aluminum—Alq 3 have been widely investigated in recent years as organometallic compounds with potential applications in modern optoelectronics [ 12 , 13 , 14 , 15 , 16 ]. The organometallic complexes combine the advantages of organic and inorganic materials, such as an ease of fabrication, architectural flexibility, excellent temporal as well as physical ruggedness, and high resistance to laser light [ 17 , 18 , 19 ].…”