Synthesis, crystal structure, spectral analysis and NLO studies of five-coordinate Zn(II) complexes of hydrazochromandione

Using a hydrazochromandione ligand, a straightforward chemical process is used to create zinc(II) complexes (1 and 2) with five coordination. Elemental microanalysis and a range of spectroscopic techniques (FT-IR, ¹H NMR and electronic spectroscopy) were used to characterize the ligand and Zn(II) complexes. Single crystal X-ray diffraction was used to identify the crystal structures of HL, complex 1 and 2, and the results showed that ligand has monoclinic system with centrosymmetric space group P21/n. Through ONO donor atoms, Zn(II) metal is coordinated to the ligand in the same way as monoanionic. Two Zn(II) complexes with a deformed square pyramidal geometry surrounding them. Interestingly, relatively strong hydrogen bonds and p-p interactions that result in supramolecular architectures preserve the stabilization of the crystal lattices. Comparing two Zn(II) complexes to hydrazochromandione ligand, they exhibit good non-linear optical response.