Source of materialThe mixture of ZnCl 2 · 2H2O( 0.1 mmol), 4,4'-bipyridine (0.1 mmol), 3-(4-(carboxymethoxy)phenyl)propanoic acid (0.1 mmol) and 10 ml water was sealed in a25mlTeflon-lined stainless reactor and heated at 120°Cfor 72 hunder autogeneous pressure, then cooled to room temperature.
Experimental detailsExcept for water oxygen atoms and zinc ions, all non-H atoms are disorderd over two sites with different occupancies. All Hatoms were placed at geometrically idealized positions with.93 Å,and Uiso(H) = 1.2.U eq (C). 3-(4-(Carboxymethoxy)phenyl)propanoic acid is a pseudo-symmetric dicarboxylic acid, atoms C7 and O8 were located at the same site, so we fixed them according to the occupancies of ahalf each (0.5). The occupancy of C6-O4' are 0.492 and 0.508 respectively (like those of other disorder atoms), but that of C7 is 1, while that of C7' is zero.
DiscussionIn recent years, the field of metal organic coordination polymers has attracted considerable attention in supramolecular and materials chemistry due to the variety of fascinating architectures, physico-chemical characteristics, and promising applications as functional materials [1][2][3][4]. The metal-organic frameworks assembled from pseudo-symmetric carboxylate ligands have been less reported. Our group described the structure of 3-(4-hydroxyphenyl)propanoic acid, one kind of pseudo-symmetric carboxylate acid, as atwo-dimensional network held together by hydrogen-bonding interactions [5]. The title complex has amononuclear structure. The crystal structure show high disorder, but not atwin. 4,4'-Bipyridine molecules (C1-C5 and N1 atoms) were modelled as disordered over two sites with refined occupancies of 0.492 and 0.508 (7), and C6, C9-C11, O3 and O4 atoms of 3-(4-(carboxymethoxy)phenyl)-propanoic acid molecules were refined as disorded over two sites with occupancies of 0.492 and 0.508. The Zn(II) ion is sixcoordinated by two nitrogen atoms from two 4,4'-bipyridine molecules, and four oxygen atoms from four water molecules. The molecules of 3-(4-(carboxy-methoxy)-phenyl)propanoic acid are completely deprotonated, linking [Zn(4,4'-bipyridine) · 4H 2 O] 2+ ions to a3Dsupramolecular strucutre through O−H···Ointerac-tions.
Combined with Cu(II) acetate, novel BINOL‐derived chiral tertiary amine ligands are developed as catalysts for the asymmetric Henry reaction of aromatic, heteroaromatic, and aliphatic aldehyde substrates.
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