Zhu‐Yan Zhang

Syntheses, crystal structures and properties of transition metal coordination polymers based on isophthalic acid and flexible bis(pyridyl) ligand with unsymmetrical spacer: influence of metal cations, ligand conformations and coordination modes

Eight new transition metal coordination complexes, namely [Mn2(ip)2(L1)2(H2O)3]n·nH2O (1), [Co(ip)L1(H2O)]n (2), [Zn(ip)L1]n (3), [Cd2(ip)2L1]n (4), [Mn(ip)L2(H2O)]n·nCH3OH (5), [M(ip)L2(H2O)]n·nH2O [M = Co (6) and Ni (7)], and [Zn3(ip)2(OH)2(L2)2]n (8) (H2ip = isophthalic acid, L1 = N-(pyridin-3-ylmethyl)pyridin-2-amine, L2 = N-(pyridin-3-ylmethyl)pyridin-3-amine), have been synthesized and characterized by elemental analysis, IR, TG, PL, powder and single-crystal X-ray diffraction. Complex 1 exhibits a 1D ‘ladder’ chain structure, which is extended by the hydrogen-bonding interactions to form a 3D supramolecular network. Complexes 2, 3 and 5 display 2D (4,4) layer networks and are extended by the hydrogen-bonding, π⋯π stacking and C–H⋯π interactions to generate 3D supramolecular networks. Complex 4 is a 3D pillared layered framework by linking a 2D Cd(II)-ip double layer with L1 molecules. Complex 6 and 7 are isomorphous and exhibit a 3D tcb net with the Schlafli symbol of 86, while complex 8 is a 3D network and presents a new topology with the Schlafli symbol of (55·69·7). The structural diversities indicate that the versatile coordination modes of the ip dianions, conformations of L1 and L2, as well as the nature of the metal cations play crucial roles in modulating structures and topologies of the coordination complexes. Moreover, solid-state luminescent properties demonstrate that complexes 3, 4 and 8 exhibit strong blue emission at room temperature.

1-Carboxy­methyl-3-hydroxy­pyridinium chloride–3-hydroxy­pyridinium-1-acetate (1/1)

# 2004 International Union of Crystallography Printed in Great Britain ± all rights reserved In the crystal structure of the title 1:1 co-crystal, C7H8NO3 + Clÿ C7H7NO3, of 1-carboxymethyl-3-hydroxypyridinium chloride with 3-hydroxypyridinium-1-acetate, the cation interacts with the zwitterion to form a ribbon that runs along the c axis of the orthorhombic unit cell. The Clÿ anions lie at the sides of the ribbon.

Hexaaqua­manganese(II) bis[(4-oxo-4H-pyridin-1-yl)acetate] dihydrate

The title complex, [Mn(H2O)6](C7H6NO3)2·2H2O, was synthesized by the reaction of MnCl2·4H2O and (4-oxo-4H-pyrindin-1-yl)acetic acid in aqueous solution. The manganese(II) ion, which lies on a center of symmetry, is octahedrally coordinated by six water molecules [Mn—O = 2.166 (1)–2.177 (1) A]. A three-dimensional supramolecular framework is formed via O—H⋯O hydrogen bonds between the anions and cations.