2-AMINO-3-NITROPYRIDINIUM HYDROGENSULFATE HYDRATE - A NONLINEAR-OPTICAL CRYSTAL ENGINEERED WITH A 2-DIMENSIONAL HYPERPOLARIZABLE CHROMOPHORE

A new nonlinear optical crystal, 2-amino-3-nitropyridinium hydrogensul fate hydrate, has been engineered following a strategy which induces t he formation of herringbone motifs of chromophores. The crystal packin g of such motifs is non-centrosymmetric, with a P2(1)2(1)2(1) space gr oup. The crystal stability is lowered by the presence of water molecul es in the host matrix. The second harmonic generation signal at 530 nm of a powder sample is slightly lower than that of 3-methyl-4-nitropyr idine N-oxide.