[o-C5H4NHOH]2[I7O18(OH)]•3H2O: An Organic-Inorganic Hybrid SHG Material Featuring an [I7O18(OH)]∞2- Branched Polyiodate Chain

An organic-inorganic hybrid polyiodate, namely, [o-C5H4NHOH](2)[I7O18(OH)]center dot 3H(2)O (I), featuring a novel branched polyiodate chain has been obtained by evaporation method. [o-C5H4NHOH](2)[I7O18(OH)]center dot 3H(2)O (I) crystalizes in the polar space group Ia and features an [I7O18(OH)](infinity)(2-) branched polyiodate chain in which [I3O9](3-) trimers are grafted on the same side of the one-dimensional (1D) chain based on [I4O11(OH)](3-) tetramers. The asymmetric organic amine groups are beneficial to the polymerization of iodate groups and inducing the formation of the non-centrosymmetric (NCS) structure. Compound I exhibits a rather large Second-Harmonic- Generation (SHG) signal of 8.5xKH(2)PO(4) (KDP) upon 1064 nm laser radiation, a moderate band gap of 3.90 eV and a high laser-induced-damage-threshold (LIDT) of 182.34 MW cm(-2), hence it is a promising new SHG material. The relationship between the structures of the organic amine groups and the overall structures has been also analyzed.

Automated summary

An organic-inorganic hybrid polyiodate with a novel branched polyiodate chain structure has been successfully synthesized. This compound exhibits excellent Second-Harmonic-Generation (SHG) performance and a high laser-induced-damage-threshold (LIDT) under laser radiation, showing promising potential for applications.