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A new member of mixed-metal Ba_2Bi_2M~Ⅱ(PO_4)_4 monophosphate, namely Ba2Bi2Co(PO4)4, was synthesized by solid state method and characterized by X-ray single-crystal diffraction and powder diffraction for the first time. It crystallizes in the orthorhombic system with space group Pnma(No. 62) and features a 3D architecture built up of adjacent zig-zag linear structures of [CoP_4O_(16)]∞ along [100], and further connected by [Bi_2O_(11)] dimers to form a 3D framework, where the Ba~(2+) are located in the free space. The stereochemical activity of the Bi~(3+) lone pair has also been discussed. The result of magnetic property measurement confirms the antiferromagnetic property of Ba_2Bi_2Co(PO_4)_4.
A new member of mixed-metal Ba_2Bi_2M ~ Ⅱ (PO_4) _4 monophosphate, namely synthesized by solid state method and X-ray single-crystal diffraction and powder for the first time. It crystallizes in the orthorhombic system with space group Pnma (No. 62) and features a 3D architecture built up adjacent zig-zag linear structures of [CoP_4O_ (16)] ∞ along [100], and further connected by [Bi_2O_ (11) to form a 3D framework, where the Ba ~ (2+) are located in the free space. The stereochemical activity of the Bi ~ (3+) lone pair has also been discussed. The result of magnetic property measurement confirms the antiferromagnetic property of Ba_2Bi_2Co (PO_4) _4.