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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Pseudo-isomerism by different Jahn-Teller ordering: Crystal structures of the hemihydrate and the monohydrate of (pyH)[MnF(H2PO4)(HPO4)] [German]
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Pseudo-isomerism by different Jahn-Teller ordering: Crystal structures of the hemihydrate and the monohydrate of (pyH)[MnF(H2PO4)(HPO4)] [German]

机译:通过不同的Jahn-Teller顺序进行伪异构:(pyH)[MnF(H2PO4)(HPO4)]的半水合物和一水合物的晶体结构[德语]

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With pyridinium counter cations (pyH(+)) the Mn-III fluoride phosphate anion [MnF(H2PO4)(HPO4)](-) can be stabilized. It forms a chain structure with Mn3+ ions bridged by a fluoride ion and two bidentate phosphate groups. Under sleightly differing conditions either the hemihydrate (pyH)[MnF(H2PO4)(HPO4)](.)0.5H(2)O (1) or the monohydrate (pyH)[MnF(H2PO4)(HPO4)](H2O)-H-. (2) is formed. The hemihydrate 1 crystallizes monoclinic in space group P2(1)/ kn, Z = 8, a 7.295(1), b = 17.052(2), c = 18.512(3) Angstrom, beta = 100.78(1)degrees, R = 0.033, the monohydrate triclinic in space group P (1) over bar, Z = 2, a 7.374(1), b 8.628(1), c = 10.329(1) Angstrom, alpha = 83.658(8)degrees, beta = 77.833(9)degrees, gamma = 68.544(8)degrees, R = 0.025. Whereas the topology of the chain anions is identical in both structures, the Jahn-Teller effect is expressed in different ordering patterns: in 1 antiferrodistortive ordering of [MnF2O4] octahedra is observed, with alternating elongation of an F-Mn-F-axis or a O-Mn-O-axis, respectively. This leads to asymmetrical Mn-F-Mn-bridges. In 2 ferrodistortive ordering is found, with elongation of all octahedra along the F-Mn-F-axis. Thus, symmetrical bridges are formed with long Mn-F distances. This unusual pseudo-isomerism is attributed to the differing influence of inter-chain hydrogen bonds. [References: 19]
机译:使用吡啶鎓抗衡阳离子(pyH(+))可以稳定Mn-III氟磷酸根阴离子[MnF(H2PO4)(HPO4)](-)。它形成了一个链结构,其中Mn3 +离子由一个氟离子和两个磷酸二齿基团桥接。在不同条件下,半水合物(pyH)[MnF(H2PO4)(HPO4)](。)0.5H(2)O(1)或一水合物(pyH)[MnF(H2PO4)(HPO4)](H2O)- H-。 (2)形成。半水合物1在空间群P2(1)/ kn中结晶为单斜晶,Z = 8,a 7.295(1),b = 17.052(2),c = 18.512(3)埃,beta = 100.78(1)度,R = 0.033,空间群P(1)上的一水合物三斜晶,bar = Z,2,a 7.374(1),b 8.628(1),c = 10.329(1)埃,alpha = 83.658(8)度,beta = 77.833 (9)度,伽马= 68.544(8)度,R = 0.025。尽管两种结构中链阴离子的拓扑结构均相同,但Jahn-Teller效应以不同的排序方式表示:在[MnF2O4]八面体的1反铁畸变排序中,F-Mn-F轴交替伸长或O-Mn-O轴。这导致不对称的Mn-F-Mn桥。在2个铁变形顺序中,所有八面体沿F-Mn-F轴伸长。因此,形成具有长Mn-F距离的对称桥。这种不寻常的伪异构现象归因于链间氢键的不同影响。 [参考:19]

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