Buckled layers in K0.66Mn2O4·0.28H2O and K0.99Mn3O6·1.25H2O synthesized at high pressure: implication for the mechanism of layer-to-tunnel transformation in manganese oxides.
A 2 × 2 layer-buckled manganese oxide, K(0.66)Mn(2)O(4)·0.28H(2)O (I), has been synthesized under high pressure and retained at ambient pressure; it is metastable and will finally transform to a 2 × 1 layer-buckled K(0.99)Mn(3)O(6)·1.25H(2)O (II) in 1 year. Both crystal structures were determined by single-crystal X-ray diffraction. On the basis of these buckled layers, which are a result of ordering of Mn(3+)/Mn(4+) in separate rows and cooperative Jahn-Teller distortion of Mn(3+)O(6) octahedra, a mechanism of structure transformation from birnessite to tunnel structures was proposed.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China.
Qingxin
Q
Chu
Xiaofeng
X
Wang
Xinhao
X
Zhang
Qiliang
Q
Li
Xiaoyang
X
Liu