Hydrothermal Assembly, Structural Multiplicity, and Catalytic Knoevenagel Condensation Reaction of a Series of Coordination Polymers Based on a Pyridine-Tricarboxylic Acid.

A pyridine-tricarboxylic acid, 5-(3',5'-dicarboxylphenyl)nicotinic acid (Hdpna), was employed as a adjustable block to assemble a series of coordination polymers under hydrothermal conditions. The seven new coordination polymers were formulated as [Co(Hdpna)(dpey)]·HO (), [Zn(dpna)(phen)] (), [Co(dpna)(2,2'-bipy)] (), [Zn(dpna)(2,2'-bipy)] (), [Co(dpna)(4,4'-bipy)(HO)]·2HO (),[Co(bpb)(HO)][Co(dpna)(HO)]·3HO (), and [Mn(dpna)(dpea)] (), wherein 1,2-di(4-pyridyl)ethylene (dpey), 1,10-phenanthroline (phen), 2,2'-bipyridine(2,2'-bipy),4,4'-bipyridine(4,4'-bipy),1,4-bis(pyrid-4-yl)benzene (bpb), and 1,2-di(4-pyridyl)ethane (dpea) were employed as auxiliary ligands. The structural variation of polymers - spans the range from a 2D sheet (-, , and ) to a 3D metal-organic framework (MOF, ).

Coordination Polymers from an Amino-Functionalized Terphenyl-Tetracarboxylate Linker: Structural Multiplicity and Catalytic Properties.

An amino-functionalized terphenyl-tetracarboxylic acid, 2'-amino-[1,1':4',1″-terphenyl]-3,3″,5,5″-tetracarboxylic acid (Htpta), was used as an adaptable linker to synthesize, under hydrothermal conditions, eight coordination polymers (CPs). The obtained products were formulated as [Co(μ-Htpta)] (), [Co(μ-Htpta)(2,2'-bipy)] (), [M(μ-Htpta)(2,2'-bipy)] (M = Mn (), Cd ()), [Ni(μ-tpta)(phen)(HO)] (), [Zn(μ-tpta)(phen)] (), {[Zn(μ-tpta)(μ-4,4'-bipy)]·HO} (), and [Zn(μ-tpta)(μ-Hbiim)(HO)] (), wherein 2,2'-bipyridine (2,2'-bipy), 4,4'-bipyridine (4,4'-bipy), 1,10-phenanthroline (phen), or 2,2'-biimidazole (Hbiim) are present as additional stabilizing ligands. The structural types of - vary from one-dimensional (1D) (, ) and two-dimensional (2D) (, , ) CPs to three-dimensional (3D) metal-organic frameworks (MOFs) (, , and ) with a diversity of topologies.

Syntheses, Crystal Structures, and Catalytic Properties of Three Cu(II) and Cobalt(II) Coordination Compounds Based on an Ether-Bridged Tetracarboxylic Acid.

Three new products, [Cu(dppa)(2,2'-bipy)(HO)]·2HO (), [Co(dppa)(phen)(HO)]·2HO (), and [Co(dppa)(4,4'-bipy)(HO)]·3HO () were synthesized using a hydrothermal method from Cu(II) and Co(II) metal(II) chlorides, 3-(3,4-dicarboxyphenoxy)phthalic acid (Hdppa), and different auxiliary ligands, namely 2,2'-bipyridine (2,2'-bipy),1,10-phenanthroline (phen), and 4,4'-bipyridine (4,4'-bipy). Products - were characterized by elemental analysis, FTIR, TGA, PXRD, SEM, and single-crystal X-ray crystallography. The structure of features a 1D chain of the 2C1 topological type.

Six metal-organic architectures from a 5-methoxyisophthalate linker: assembly, structural variety and catalytic features.

A methoxy-functionalized isophthalic acid, 5-methoxy isophthalic acid (Hmia), was used a versatile linker for assembling six new metal(ii) compounds under hydrothermal conditions. The obtained products were [Cu(μ-mia)(phen)(HO)]·2HO (1), [Mn(μ-mia)(phen)] (2), [Co(μ-mia)(2,2'-bipy)(HO)]·HO (3), [Co(μ-mia)(μ-4,4'-bipy)]·HO (4), [Co(μ-mia)(py)] (5), and [Cd(μ-mia)(py)(HO)]·HO (6), where phen(1,10-phenanthroline), 2,2'-bipy(2,2'-bipyridine), 4,4'-bipy(4,4'-bipyridine) or py(pyridine) were incorporated as auxiliary ligands. The crystal structures of 1-6 range from 0D (1) and 1D (2, 3, 5, 6) CPs to a 2D network (4) with a variety of topological types.

Coordination Polymers Constructed from an Adaptable Pyridine-Dicarboxylic Acid Linker: Assembly, Diversity of Structures, and Catalysis.

4,4'-(Pyridine-3,5-diyl)dibenzoic acid (Hpdba) was explored as an adaptable linker for assembling a diversity of new manganese(II), cobalt(II/III), nickel(II), and copper(II) coordination polymers (CPs): [Mn(μ-pdba)(HO)] (), {[M(μ-pdba)(phen)]·2HO} (M = Co (), Ni ()), {[Cu(μ-pdba)(bipy)]·2HO} (), {[Co(μ-pdba)(bipy)]·2HO} (), [Co(μ-pdba)(μ-Hbiim)(Hbiim)] (), and [M(μ-pdba)(py)] (M = Co (), Ni ()). The CPs were hydrothermally synthesized using metal(II) chloride precursors, Hpdba, and different coligands functioning as crystallization mediators (phen: 1,10-phenanthroline; bipy: 2,2'-bipyridine, Hbiim: 2,2'-biimidazole; py: pyridine). Structural networks of - range from two-dimensional (2D) metal-organic layers (-, -) to three-dimensional (3D) metal-organic framework (MOF) () and disclose several types of topologies: (in ), (in , , ), (in ), 3,5L66 (in ), and SP 2-periodic net (6,3)Ia (in , ).

Coordination Polymers from Biphenyl-Dicarboxylate Linkers: Synthesis, Structural Diversity, Interpenetration, and Catalytic Properties.

The present work explores two biphenyl-dicarboxylate linkers, 3,3'-dihydroxy-(1,1'-biphenyl)-4,4'-dicarboxylic (HL) and 4,4'-dihydroxy-(1,1'-biphenyl)-3,3'-dicarboxylic (HL) acids, in hydrothermal generation of nine new compounds formulated as [Co(μ-HL)(phen)(HO)] (), [Mn(μ-HL)(phen)]·4HO (), [Zn(μ-HL)(2,2'-bipy)(HO)] (), [Cd(μ-HL) (2,2'-bipy)(HO)] (), [Mn(μ-HL)(μ-HL)(μ-4,4'-bipy)]·4HO (), [Zn(μ-HL)(μ-4,4'-bipy)] (), [Zn(μ-HL)(phen)] (), [Cd(μ-HL)(phen)] (), and [Cu(μ-HL) (μ-4,4'-bipy)(HO)] (). These coordination polymers (CPs) were generated by reacting a metal(II) chloride, a HL or HL linker, and a crystallization mediator such as 2,2'-bipy (2,2'-bipyridine), 4,4'-bipy (4,4'-bipyridine), or phen (1,10-phenanthroline). The structural types of - range from molecular dimers () to one-dimensional (, , ) and two-dimensional (, ) CPs as well as three-dimensional metal-organic frameworks (, , ).

H-Bonded and metal(ii)-organic architectures assembled from an unexplored aromatic tricarboxylic acid: structural variety and functional properties.

This study reports the application of an aromatic tricarboxylic acid, 2,5-di(4-carboxylphenyl)nicotinic acid (H3dcna) as a versatile and unexplored organic building block for assembling a new series of metal(ii) (M = Co, Ni, Zn, Fe, and Mn) complexes and coordination polymers, namely [M(Hdcna)(phen)2(H2O)]·H2O (M = Co (1), Ni (2)), [Zn(μ-Hdcna)(phen)]n (3), [Co(μ-Hdcna)(bipy)(H2O)2]n·nH2O (4), [Zn2(μ-Hdcna)2(bipy)2(H2O)4]·6H2O (5), [Zn(μ3-Hdcna)(H2biim)]n (6), [Ni2(Hdcna)2(μ-bpb)(bpb)2(H2O)4] (7), [Fe(μ4-Hdcna)(μ-H2O)]n·nH2O (8), and [Mn3(μ5-dcna)2(bipy)2(H2O)2]n·2nH2O (9). Such a diversity of products was hydrothermally prepared from the corresponding metal(ii) salts, H3dcna as a principal multifunctional ligand, and N-donor mediators of crystallization (1,10-phenanthroline, phen; 2,2'-bipyridine, bipy; 2,2'-biimidazole, H2biim; or 1,4-bis(pyrid-4-yl)benzene, bpb). The obtained products 1-9 were fully characterized by standard methods (elemental analysis, FTIR, TGA, PXRD) and the structures were established by single-crystal X-ray diffraction.

Hydrothermal generation, structural versatility and properties of metal(ii)-organic architectures driven by a pyridine-tricarboxylic acid.

An aromatic tricarboxylic acid, 4-(6-carboxy-pyridin-3-yl)-isophthalic acid (Hcpia), was applied as a building block for the hydrothermal syntheses of a new series of twelve metal(ii) (M = Mn, Co, Ni, Zn, Cd, Pb) coordination compounds, namely [Mn(Hcpia)(HO)] (1), [M(Hcpia)(phen)(HO)] (M = Co, 2; Ni, 3; Zn, 4), [Zn(Hcpia)(2,2'-bipy)(HO)]·4HO (5), [Zn(μ-Hcpia)(2,2'-bipy)] (6), [M(μ-Hcpia)(phen)(HO)] (M = Co, 7; Cd, 8), {[Pb(μ-Hcpia)]·2HO} (9), [Cd(μ-cpia)Cl(phen)(HO)]·10HO (10), {[Zn(μ-cpia)(phen)]·10HO} (11), and {[Zn(μ-cpia)(μ-OH)(μ-4,4'-bipy)]·4,4'-bipy·2HO} (12). These products were assembled from aqueous mixtures containing metal(ii) chlorides, Hcpia as a main tricarboxylic acid block, sodium hydroxide and an optional N-donor crystallization mediator (i.e.

Cobalt(II) Coordination Polymers Assembled from Unexplored Pyridine-Carboxylic Acids: Structural Diversity and Catalytic Oxidation of Alcohols.

New coordination polymers of cobalt(II), namely, [Co(μ-cpna)(HO)] (1), [Co(μ-cpna)(phen)(HO)] · nHO (2), [Co(μ-dppa)(HO)] ·2 nHO (3), and [Co(μ-dppa)(μ-4,4'-bipy)(HO)] ·4 nHO (4), have been generated under hydrothermal conditions from CoCl·6HO, two different multifunctional pyridine-carboxylic acids {Hcpna: 5-(4-carboxyphenoxy)nicotinic acid; Hdppa: 5-(3,4-dicarboxylphenyl)picolinic acid}, and optional N, N-supporting ligands {phen: 1,10-phenanthroline; 4,4'-bipy: 4,4'-bipyridine} acting as mediators of crystallization. These Co(II) coordination polymers (CPs) have been obtained as stable crystalline materials and characterized by conventional solid-state techniques, including X-ray crystallography. The obtained products are 3D metal-organic frameworks (MOFs 1 and 4) or 2D coordination polymers (CPs 2 and 3).

Metal-Organic Architectures Assembled from Multifunctional Polycarboxylates: Hydrothermal Self-Assembly, Structures, and Catalytic Activity in Alkane Oxidation.

A three-component aqueous reaction system comprising copper(II) acetate (metal node), poly(carboxylic acid) with a phenylpyridine or biphenyl core (main building block), and 1,10-phenanthroline (crystallization mediator) was investigated under hydrothermal conditions. As a result, four new coordination compounds were self-assembled, namely, {[Cu(μ-cpna)(phen)]·HO} (1), {[Cu(μ-Hbtc)(phen)]·HO} (2), {[Cu(μ-Hcpic)(phen)]·2HO} (3), and [Cu(μ-Hcptc)(phen)]·6HO (4), where Hcpna = 5-(2'-carboxylphenyl)nicotinic acid, Hbtc = biphenyl-2,4,4'-tricarboxylic acid, Hcpic = 4-(5-carboxypyridin-2-yl)isophthalic acid, Hcptc = 2-(4-carboxypyridin-3-yl)terephthalic acid, and phen = 1,10-phenanthroline. Crystal structures of compounds 1-3 reveal that they are 1D coordination polymers with a ladder, linear, or double-chain structure, while product 4 is a 0D hexanuclear complex.

New Copper(II) Coordination Compounds Assembled from Multifunctional Pyridine-Carboxylate Blocks: Synthesis, Structures, and Catalytic Activity in Cycloalkane Oxidation.

Two new copper(II) coordination compounds, namely a 1D coordination polymer [Cu(µ-cpna)(phen)(H₂O)] () and a discrete tetracopper(II) derivative [Cu(phen)₂(H₂O)]₂[Cu₂(µ-Hdppa)₂(Hdppa)₂] (), were hydrothermally synthesized from copper(II) chloride as a metal source, 5-(4-carboxyphenoxy)nicotinic acid (H₂cpna) or 5-(3,4-dicarboxylphenyl)picolinic acid (H₃dppa) as a principal building block, and 1,10-phenanthroline (phen) as a crystallization mediator. Compounds and were isolated as air-stable microcrystalline solids and fully characterized by elemental and thermogravimetric analyses, IR spectroscopy, powder and single-crystal X-ray diffraction. In the solid state, the structure of discloses the linear interdigitated 1D coordination polymer chains with the 2C1 topology.

A new series of Cd(ii) metal-organic architectures driven by soft ether-bridged tricarboxylate spacers: synthesis, structural and topological versatility, and photocatalytic properties.

Two multifunctional, ether-bridged tricarboxylic acids, 2-(4-carboxylphenoxy)terephthalic acid (H3cpta) and 2-(3,5-dicarboxylatobenzyloxy)benzoic acid (H3dbba), were used as unexplored and highly versatile building blocks for the hydrothermal generation of a novel series of cadmium(ii) metal-organic architectures. These were formulated as [Cd(μ-Hcpta)(phen)(py)]n (1), {[Cd3(μ5-cpta)2(phen)3]·8H2O}n (2), {[Cd3(μ5-cpta)2(2,2'-bipy)3]·6H2O}n (3), {[Cd(μ3-cpta)(Hbpa)]·2H2O}n (4), {[Cd6(μ4-cpta)2(μ6-cpta)2(H2biim)2(H2O)6]·5H2O}n (5), [Cd3(μ4-cpta)2(μ-prz)(H2O)4]n (6), {[Cd3(μ4-dbba)2(phen)3]·H2O}n (7), and {[Cd3(μ3-dbba)2(2,2'-bipy)3(H2O)3]·2H2O}n (8) on the basis of single-crystal X-ray diffraction, elemental analysis, FTIR, PXRD, and TGA data. Products 1-8 were assembled in the presence of N-donor crystallization mediators selected from pyridine (py), 1,10-phenanthroline (phen), 2,2'-bipyridine (2,2'-bipy), bis(4-pyridyl)amine (bpa), 2,2'-biimidazole (H2biim), or piperazine (prz).

A new series of Co, Ni, Zn, and Cd metal-organic architectures driven by an unsymmetrical biphenyl-tricarboxylic acid: hydrothermal assembly, structural features and properties.

This study reports the hydrothermal synthesis of a novel series of twelve coordination compounds, namely, {[Cd(μ-Hnbtc)(H2O)4]·H2O}n (1), [Zn2(μ-Hnbtc)2(phen)2]·2H2O (2), [Zn(Hnbtc)(phen)2(H2O)]·4.5H2O (3), [Ni(Hnbtc)(phen)2(H2O)]·6H2O (4), [Zn2(μ-Hnbtc)2(2,2'-bipy)2]·2H2O (5), [Cd3(μ5-nbtc)(μ6-nbtc)(2,2'-bipy)2(H2O)]n (6), {[Zn3(μ3-nbtc)2(phen)3(H2O)2]·4H2O} (7), [Co(H2O)6][Co2(nbtc)2(μ-4,4'-bipy)(4,4'-bipy)2(H2O)6]·8H2O (8), {[Ni3(μ4-nbtc)2(μ-4,4'-bipy)2.5(μ-H2O)(H2O)3]·4H2O}n (9), {[Cd2(μ4-nbtc)(μ-OH)(2,2'-bipy)2]·H2O}n (10), [Cd2(μ4-nbtc)(μ-OH)(phen)2(H2O)]n (11), and {[Zn2(μ5-nbtc)(μ3-OH)(μ-4,4'-bipy)]·4,4'-bipy·H2O}n (12), which are derived from 3'-nitro-biphenyl-2,4,4'-tricarboxylic acid (H3nbtc) as a virtually unexplored building block.

Hydrothermal assembly, structures, topologies, luminescence, and magnetism of a novel series of coordination polymers driven by a trifunctional nicotinic acid building block.

In this work, a trifunctional N,O-building block, 5-(4-carboxyphenoxy)nicotinic acid (Hcpna), that combines three distinct types of functional groups (COOH, N-pyridyl, and O-ether) was used for the hydrothermal assembly of thirteen new coordination compounds: [Co(μ-Hcpna)] (1), [Mn(μ-cpna)(HO)] (2), [Mn(μ-cpna)(HO)] (3), [Mn(μ-cpna)(2,2'-bipy)(HO)] (4), {[Ni(μ-cpna)(2,2'-bipy)(HO)]·HO} (5), {[Cd(μ-cpna)(2,2'-bipy)]·2HO} (6), [Zn(μ-cpna)(2,2'-bipy)] (7), [Cu(μ-cpna)(2,2'-bipy)(HO)] (8), {[Mn(μ-cpna)(phen)]·6HO} (9), {[Ni(μ-cpna)(phen)(HO)]·HO} (10), [Zn(μ-cpna)(phen)] (11), {[Pb(μ-cpna)(phen)]·HO} (12), and [Ni(μ-cpna)(4,4'-bipy)(HO)] (13). These products were synthesized from the corresponding metal(ii) chlorides, Hcpna, NaOH, and optional N-donor supporting ligands or templates {bis(4-pyridyl)amine (bpa), 2,2'-bipyridine (2,2'-bipy), 4,4'-bipyridine (4,4'-bipy), or 1,10-phenanthroline (phen)}. Products 1-13 were characterized in the solid state by standard methods, including elemental and thermogravimetric analysis (TGA), IR spectroscopy, and powder (PXRD) and single-crystal X-ray diffraction.

Lanthanide coordination polymers based on 5-(2'-carboxylphenyl) nicotinate: syntheses, structure diversity, dehydration/hydration, luminescence and magnetic properties.

Twelve lanthanide coordination polymers associated with the organic ligand 5-(2′-carboxylphenyl) nicotinic acid (H2cpna): {[Ln(Hcpna)(cpna)(phen)]·H2O}n (Ln = Sm (1), Tb (2), Ho (3), phen = 1,10-phenanthroline), {[Sm(Hcpna)(cpna)(phen)]·2H2O}n (4), {[Ln2(cpna)3(H2O)3]·4H2O}n (Ln = Y (5), Tb(6), Dy (7), Ho (8)), [Lu2(cpna)3(H2O)2]n (9), {[Y2(cpna)3(phen)2(H2O)]·H2O}n (10), and [Ln(cpna)(phen)(NO3)]n (Ln = Tm (11), Lu (12)) have been prepared by hydrothermal methods and structurally characterized. The structure analyses reveal that complexes 1–3 are isostructural and possess unique three-dimensional (3D) frameworks based on the dodecanuclear Sm/Tb/Ho macrocycles. Complex 4 exhibits a one-dimensional (1D) wheel-chain structure, which further builds three-dimensional (3D) supramolecular architecture via O–HN hydrogen-bonding interactions.

Poly[diaqua-bis-(nitrato-κ²O,O')bis-(1,10-phenanthroline-κ²N,N')-μ₃-succinato-dicadmium].

In the title coordination polymer, [Cd₂(C₄H₄O₄)(NO₃)₂(C₁₂H₈N₂)₂(H₂O)₂](n), the Cd(II) ion is seven-coordinated within a distorted penta-gonal-bipyramidal O₅N₂ environment. The succinate anions, located on an inversion centre, adopt a bis-monodentate bridging mode, leading to the formation of rods along [100]. The rods are connected by O-H⋯O hydrogen bonds between the coordinating water mol-ecules and nitrate O atoms of adjacent rods; the same type of hydrogen bonds are also observed between water and carboxyl-ate O atoms within the rods.

N-[2-(2-Hy-droxy-eth-oxy)pheneth-yl]phthalimide.

The title compound, C(18)H(17)NO(4), was obtained accidentally through acid-catalysed aromatization of a phthalimide-substituted 2-(1-hy-droxy-eth-yl)cyclo-hex-2-enone. It exhibits an intra-molecular O-H⋯O(c) (c = carbonyl) hydrogen bond and forms a three-dimensional network structure via π-π stacking inter-actions between adjacent benzene rings (phthalimide-to-phenyl-ene and phthalimide-to-phthalimide), with centroid-centroid distances of 3.8262 (6) and 3.

Di-μ-benzoato-κO,O':O';κO:O,O'-bis-[(benzoato-κO,O')(1,10-phenanthroline-κN,N')cadmium].

The dinuclear title compound, [Cd(2)(C(7)H(5)O(2))(4)(C(12)H(8)N(2))(2)], lies on a crystallographic twofold axis. The Cd(II) ions are connected by two bridging benzoate anions and each ion is seven-coordinated by five O atoms from three benzoate ligands and by two N atoms from 1,10-phenanthroline. The benzoate ligands adopt two different coordination modes, acting as bidentate and bridging tridentate ligands.

Di-μ-benzoato-κO,O':O;κO:O,O'-bis-[(benzoato-κO,O')(1,10-phenanthroline-κN,N')lead(II)].

In the centrosymmetric dinuclear title compound, [Pb(2)(C(7)H(5)O(2))(4)(C(12)H(8)N(2))(2)], two Pb(2+) ions are connected by two tridentate bridging benzoate anions. The Pb(2+) ion is seven-coordinated by five O atoms from three benzoate anions and two N atoms from the 1,10-phenanthroline ligands. The benzoate anions adopt two different coordination modes, one bidentate-chelating and one tridentate bridging-chelating.

Poly[[triaqua-(μ(3)-4-oxidopyridine-2,6-dicarboxyl-ato)holmium(III)] mono-hydrate].

In the title coordination polymer, {[Ho(C(7)H(2)NO(5))(H(2)O)(3)]·H(2)O}(n), the Ho(III) atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl-ate trianion, two monodentate anions and three water mol-ecules, forming a distorted bicapped trigonal-prismatic HoNO(7) coordination geometry. The anions bridge adjacent Ho(III) ions into double chains. Adjacent chains are further connected into sheets.

Poly[[triaqua-(μ(3)-4-oxidopyridine-2,6-dicarboxyl-ato)thulium(III)] monohydrate].

In the title coordination polymer, {[Tm(C(7)H(2)NO(5))(H(2)O)(3)]·H(2)O}(n), the Tm(III) atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl-ate trianion, two monodentate anions and three water mol-ecules, forming a distorted bicapped trigonal-prismatic TmNO(7) coordination geometry. The anions bridge adjacent Tm(III) ions into double chains. Adjacent chains are further connected into sheets.

Poly[diaqua-tris-(μ(4)-1,3-phenyl-enediacetato)-dineodymium(III)].

In the title coordination polymer, [Nd(2)(C(10)H(8)O(4))(3)(H(2)O)(2)](n), each of the two Nd(III) ions is nine-coordinated by eight O atoms from six different 2,2'-(m-phenyl-ene)diacetate (pda) bivalent anions and by one O atom from a water mol-ecule, forming a distorted tricapped trigonal-prismatic coordination geometry. Eight Nd(III) ions and 12 pda ligands form a large [Nd(8)(pda)(12)] ring, and four Nd(III) ions and six pda ligands form a small [Nd(4)(pda)(6)] ring. These rings are further connected by the coordination inter-actions of pda ligands and Nd(III), generating a three-dimensional supra-molecular framework.

Poly[[triaqua-(μ(3)-4-oxidopyridine-2,6-dicarboxyl-ato)terbium(III)] monohydrate].

In the title coordination polymer, {[Tb(C(7)H(2)NO(5))(H(2)O)(3)]·H(2)O}(n), the Tb(III) atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl-ate trianion, two adjacent monodentate anions and three water mol-ecules, forming a distorted bicapped trigonal-prismatic TbNO(7) coordination environment. The anions bridge adjacent Tb(III) ions into double chains. Adjacent chains are further connected into sheets parallel to (10).

Poly[diaqua-tris-(μ(4)-1,3-phenyl-ene-diacetato)-dicerium(III)].

In the title coordination polymer, [Ce(2)(C(10)H(8)O(4))(3)(H(2)O)(2)](n), each Ce(III) atom is nine-coordinated by eight O atoms from six different 1,3-phenyl-enediacetate (pda) bivalent anions and one O atom from a coordinated water mol-ecule, forming a distorted tricapped trigonal-prismatic coordination geometry. Eight Ce(III) ions and twelve pda ligands form a large [Ce(8)(pda)(12)] ring, and four Ce(III) ions and six pda ligands form a small [Ce(4)(pda)(6)] ring. The rings are further connected by the coordination inter-actions of pda ligands and Ce(III), generating a three-dimensional supra-molecular framework.