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Crystal structure of bis{aqua[m-2-(2-carboxylatophenyl)acetatok3O1: O3,O4](1,10-phenanthroline-k2N,N')manganese(II)}, [Mn(C9H6O4)(C12H8N2)(H2O)]2 Abstract C21H16MnN2O5, monoclinic, P21/n (no. 14), a = 8.913(1) Å, b = 19.290(3) Å, c = 11.150(2) Å, b = 97.992(2)°, V = 1898.3 Å3, Z = 4, Rgt(F) = 0.040, wRref(F2) = 0.097, T = 296 K. Source of material The mixture of 2-(2-carboxyphenyl)ace tic acid (homophthalic acid = H2hmph, 0.1 mmol, 0.0181 g), 1,10-phenanthroline hydrate (0.1 mmol, 0.01980 g), Mn(OAc)2 × 4H2O (0.1 mmol, 0.0243 g), NaOH (0.1 mmol, 0.0393 g) and H2O (8 ml) was placed in a Tef lon-lined stainless-steel vessel, heated to 393 K for 3 days, and then slowly cooled down to room tem per a ture for crys tal li za tion. Pink block-shaped crystals of the title compound were ob tained. Discussion Design and construction of supramolecular coordination polymeric networks depending upon hydrogen bonding and/or pp stacking interactions is of great interest due to the enormous variety of in triguing structural topologies and the potential use of these materials as functional materials [1-3]. It is well known that flexible aromatic multi-carboxylate ligands play a crucial role in creating desirable frameworks, and that N-containing auxiliary ligands can modify the structures and properties of the resulting metal-organic complexes [4-6]. With these considerations in mind, we have chosen the homophthalic acid (H2hmph) as a bridging ligand to construct new coordination complexes. The asymmetric unit of the title crystal structure contains one manganese cation, a phen, a hmph2– and one coordinating water molecule. In this complex, manganese atom is six-coordinated in a distorted octahedral manner (MnN2O4) by two N atoms from a chelating phen ligand, three oxygen atoms from two hmph anions and one coordinating water molecule, with respective bond lengths of 2.238(2), 2.259(2) and 2.102(2)-2.272(2) Å. The adjacent Mn atoms are separated by two hmph anion connectors to form a dinuclear building unit with a MnMn separation within the binuclear unit is equal to 6.6338(9) Å. Each dinuclear building unit interacts with an other two by hydrogen bonding of the coordinating water and one of acetato oxygen atoms (d(O5O4) = 2.660(3) Å and O–HO = 170.3°), forming a one-dimensional double-chain along [010]. The hydrogen bonds between uncoordinating oxygen atom of the -COO- group and coordinating water molecule (d(O5O2#) = 2.665(3) Å, O–HO = 150.1°) are also present in the chain. Weaker pp interactions are ob served between the phen ligands of the two adjacent chains, forming a layer structure. Individual layers are entirely cohered together by relatively weak van der Waals inter - actions to form a 3D supramolecular network. The structure of the title complex is isostructural with the previously re ported [M2(hmph)2(phen)2(H2O)2](M = Zn,Co,Ni) [7-10], showing that metal(II) ions may not have a significant effect on the assembly of the coordination net works. |
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