Selten‐Erd‐Metall‐Koordinationspolymere: Synthesen und Kristallstrukturen von sechs neuen Pimelinaten, [M(Pim)(PimH)(H2O)](H2O) (M = Ce,Pr) und [M2(Pim)3(H2O)4] (M = Tb,Ho, Er,Tm) |
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Authors: | Holger Flemig Ingo Pantenburg Gerd Meyer |
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Abstract: | Rare‐Earth‐Metal Coordination Polymers: Syntheses and Crystal Structures of Six New Pimelinates, M(Pim)(PimH)(H2O)](H2O) (M = Ce, Pr) and M2(Pim)3(H2O)4] (M = Tb, Ho, Er, Tm) The new rare‐earth metal carboxylates M(Pim)(PimH)(H2O)](H2O) (M = Ce ( 1 ), Pr ( 2 )) and M2(Pim)3(H2O)4] (M = Tb ( 3 ), Ho ( 4 ), Er ( 5 ), Tm ( 6 )) were prepared from the reaction of pimelinic acid with CeO2, Pr6O11, Tb4O7, HoCl3, ErCl3 and Tm(NO3)3, respectively. Their crystal structures were determined by single‐crystal X‐ray diffraction. M(Pim)(PimH)(H2O)](H2O) crystallize in the monoclinic space group P21/n (no. 14) with a = 909.6(1), b = 870.6(1), c = 2240.5(2) pm, β = 92.30(1)°, Z = 4 (crystal data for M = Ce). The isostructural pimelinate‐hydrates M2(Pim)3(H2O)4] crystallize with orthorhombic symmetry, Pbcn (no. 60), with a = 1392.5(1), b = 902.3(1), c = 2408.8(2) pm, Z = 4 (crystal data for M = Tb). The rare‐earth cations have coordination numbers of 10 ( 1 , 2 ) and 9 ( 3 , 4 , 5 and 6 ), respectively. In the crystal structure of M(Pim)(PimH)(H2O)](H2O) bidentate and tridentate‐bridging carboxylate groups form rather dense structures in which chains are bridged to layers and further to networks. Pimelinic acid molecules fill the channels. In M2(Pim)3(H2O)4] tridentate‐bridging carboxylate groups coordinating to two rare‐earth ions lead to dimers that are linked with other dimers to strands. The channels thus formed between the strands are rather small in diameter. They do not contain any non‐coordinated water molecules. |
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Keywords: | Pimelinic acid Rare‐earth metals Coordination polymers |
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