Synthesis, crystal structure, near-IR photoelectric response of two 1-D selenides: [Cu2MSe5]·[Mn(H+-en)2(en)] (M=Ge, Sn)

Two isostructural compounds feature a 1-D anionic chain of [Cu2MSe5]4- (M=Ge, Sn) with the existence of strong Cu···Cu interaction. [Cu2GeSe5]·[Mn(H+-en)2(en)] displays a slight photocurrent under the irradiation of visible light, and [Cu2SnSe5]·[Mn(H+-en)2(en)] shows good photocurrent response in near-IR range.220