Single crystals of a new quaternary rare-earth selenide RbEr2Cu3Se5 have been isolated through the RbCl flux reaction in the RE-Cu-Se system. The title compound crystallizes in an orthorhombic system, space group Cmcm...Single crystals of a new quaternary rare-earth selenide RbEr2Cu3Se5 have been isolated through the RbCl flux reaction in the RE-Cu-Se system. The title compound crystallizes in an orthorhombic system, space group Cmcm with a = 4.089(2), b = 14.498(6), c = 16.977(2) Angstrom, V = 1006.5(7) Angstrom(3), Z = 4, D-c = 6.63 g/cm(3), F(000) = 1720 and mu(MoKalpha) = 45.51 mm(-1). The final R = 0.0498 and wR = 0.0734 for 1401 observed reflections with I > 3 sigma(1). The structure of RbEr2Cu3Se5 is a three-dimensional tunnel structure composed of ErSe6 and CuSe4 polyhedra with the charge-balanced Rb+ cations stuffing into the one-dimensional channels along the a direction. In the Er2RbCu3Se5 structure, the (1)(infinity) [Er2Se(1)(4/2)SE(2)(2)Se(3)(4/2)] double-octahedral chains are linked into a (2)(infinity) [Er2Cu2Se6] layer in the a-b plane via sharing Se(1)-Se(3) edges with the (1)(infinity) [Cu(2)(2)Se(1)(2)Se(3)(4/2)] double tetrahedral chains, and (2)(infinity)[Er2CU2Se6] layers are further interconnected along the c direction by sharing Se(1)-Se(2) edges with the (1)(infinity) [Cu(1)Se(1)(2)Se(2)(2/2)] tetrahedral chains, forming a three-dimensional framework with the channels along the a axis accommodated by Rb+ ions.展开更多
基金Supported by the Director Fund of Fujian Institute of Research on the Structure of Matter (No. 200196)
文摘Single crystals of a new quaternary rare-earth selenide RbEr2Cu3Se5 have been isolated through the RbCl flux reaction in the RE-Cu-Se system. The title compound crystallizes in an orthorhombic system, space group Cmcm with a = 4.089(2), b = 14.498(6), c = 16.977(2) Angstrom, V = 1006.5(7) Angstrom(3), Z = 4, D-c = 6.63 g/cm(3), F(000) = 1720 and mu(MoKalpha) = 45.51 mm(-1). The final R = 0.0498 and wR = 0.0734 for 1401 observed reflections with I > 3 sigma(1). The structure of RbEr2Cu3Se5 is a three-dimensional tunnel structure composed of ErSe6 and CuSe4 polyhedra with the charge-balanced Rb+ cations stuffing into the one-dimensional channels along the a direction. In the Er2RbCu3Se5 structure, the (1)(infinity) [Er2Se(1)(4/2)SE(2)(2)Se(3)(4/2)] double-octahedral chains are linked into a (2)(infinity) [Er2Cu2Se6] layer in the a-b plane via sharing Se(1)-Se(3) edges with the (1)(infinity) [Cu(2)(2)Se(1)(2)Se(3)(4/2)] double tetrahedral chains, and (2)(infinity)[Er2CU2Se6] layers are further interconnected along the c direction by sharing Se(1)-Se(2) edges with the (1)(infinity) [Cu(1)Se(1)(2)Se(2)(2/2)] tetrahedral chains, forming a three-dimensional framework with the channels along the a axis accommodated by Rb+ ions.
