Two metal chalcogenides, Hg2Te2X2 (XBr, I): 3-D framework constructed from novel left-handed helices

A new family of IIB2Q2X2 system, possessing an acentric nature that allows them to be a potential NLO material, has been synthesized via solid-state reactions. The crystal structures are characterized by a 3-D framework structure, comprising of interconnected left-handed helices. Optical absorption spectra show that both compounds are excellent candidate for potential photoelectric materials.