Metal Carboxylates with Open Architectures

Rao, C. N. R.; Natarajan, Srinivasan; Vaidhyanathan, Ramanathan

doi:10.1002/anie.200300588

Cited by 1,905 publications

(639 citation statements)

References 472 publications

(214 reference statements)

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“…The design of supramolecular architectures employing carboxylic acids as ambidentate and templating ligands with metals providing interesting connectivity, is an area of current research [1,2]. As part of our metal carboxylate research program [3][4][5], we describean ew structureo fz inc4 -nitrobenzoate complex here.…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of hexaaquazinc(II) 4-nitrobenzoate dihydrate, C14H24N2O16Zn

Shen

Lin

2013

Zeitschrift Für Kristallographie - New Crystal Structures

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Source of material 1.5mL(1M)ofK 2 CO 3 was added dropwise to 5mLaqueous solution of 0.136 g(0.1mmol) ZnCl 2 to produce awhite precipitate, whichwas separated by centrifugation and washed several times untiln oC l -anions were detectable. Thep recipitate was then addedtoastirred solution of 0.334g(2.0mmol) 4-nitrobenzoic acid and 0.069 g(1.0 mmol) imidazole with amixed solvent consisting of 10 mL H 2 Oand 10 mL CH 3 OH. After stirring for 45 min, the solid was filtered off, the filtrate (pH =5.31) was allowed to stand at room temperature. Slow evaporation within several days afforded colourless crystals. Experimental detailsAllHa toms boundt oCw erep ositioned geometricallya nd refinedasriding,withC-H =0.93Åand U iso (H) =1.2U eq (C). Hatoms attached to Owere located in difference Fourier maps and placed at fixedpositions with U iso (H) =1.5U eq (O). (2) -2.081(2) Å), which are in good agreement with those reported complexes [6]. The transoid bond angles about the central Zn atom are equal to 180°due to the local crystallographic imposition whereas the cisoid bond angles fall in region 89.1°-90.6°. Thecomplex cations are each hydrogen-bonded to lattice water molecules to form two-dimensional cationic layers parallel to (001) with d(O···O) =2 .640 -3 .010 Åa nd ÐO-H···O =149°-175°. The observed bond lengths and angles of the 4-nba anion are in the normalrange and are comparable with those reported for compounds containing the free 4-nba anion [7,8]. The structure can be envisaged as one in which layers of cations alternatewithlayersofanions, and the layers are linked by hydrogen bonds(d(O···O)=2.640-3.010 Åand ÐO-H···O = 149°-175°), giving rise to at hree-dimensional supramolecular network. In the anions layers, there also exist p-p stacking between the 4-nba anions with Cg-Cg distances of 3.653 and 3.728 Å. Discussion

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Section: Discussionmentioning

confidence: 99%

Crystal structure of hexaaquazinc(II) 4-nitrobenzoate dihydrate, C14H24N2O16Zn

Shen

Lin

2013

Zeitschrift Für Kristallographie - New Crystal Structures

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“…Carboxylate complexes have been widely studied in recent years duetotheir interestingcoordinationchemistry allowing forunusuals tructuralf eaturesa nd leadingt ov arious physical and chemical properties and practical applications in fields of dyes, extractants, drugs, pesticides and catalysts [1][2][3][4]. In recent years, the heavy element cadmium has received increased attention for its impact on plants andtoxicity to humans as well as the luminescent properties of its complexes [5][6].…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of diaqua(5-nitrosalicylate)cadmium(II), Cd(H2O)2(C7H7NO7)

Jin¹,

Chen²,

Ge³

et al. 2011

Zeitschrift Für Kristallographie - New Crystal Structures

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C 7 H 7 CdNO 7 ,triclinic, P1 (no. 2), a =7.0850(6) Å, b =7.5509(7) Å, c =10.713(1) Å, a =104.696(1)°, Source of materialCrystals of diaqua(5-nitrosalicylate)cadmium(II) were formed during an experiment to synthesize the mixed-ligand cadmium complex. As olution of cadmium acetate dihydrate (27 mg, 0.1 mmol) in 5m Lo fM eOH was added to aM eOH solution (3 mL) containing 3,5-dimethylpyrazole (19.2mg, 0.2 mmol) and 5-nitrosalicylic acid (36.6mg, 0.2 mmol), under continuous stirring. The solution was stirred for about 3h at room temperature, a small amount of precipitate formed, then af ew drops of concentrated ammonia was added till thep recipitate dissolved completely. The clear solution was filtered into the test tubeand after several days, colorless block crystals were obtained by slow evaporationofthe ammonia solution at ambient temperature. Experimental detailsAllHa toms attached to Ca toms were fixed geometrically and treated as riding with d(C-H) =0.93 Åwith U iso (H) =1.2 U eq (C). Ha toms of water molecule were located in difference Fourier mapand included in the subsequent refinement using restraints of d(O-H) =0.85(1) Åwith U iso (H) =1.5 U eq (O). In the last stage of refinement, they were treated as riding on the Oatom.

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“…In 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.…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of tetraaqua-(4,4′-bipyridyl)zinc(II) 3-(4-(carboxymethoxy) phenyl)propanoate, [Zn(H2O)4(C10H8N2)][C11H10O5]

Ao¹,

Liu²,

Liu³

2009

Zeitschrift Für Kristallographie - New Crystal Structures

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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.

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Metal Carboxylates with Open Architectures

Cited by 1,905 publications

References 472 publications

Crystal structure of hexaaquazinc(II) 4-nitrobenzoate dihydrate, C14H24N2O16Zn

Crystal structure of hexaaquazinc(II) 4-nitrobenzoate dihydrate, C14H24N2O16Zn

Crystal structure of diaqua(5-nitrosalicylate)cadmium(II), Cd(H2O)2(C7H7NO7)

Crystal structure of tetraaqua-(4,4′-bipyridyl)zinc(II) 3-(4-(carboxymethoxy) phenyl)propanoate, [Zn(H2O)4(C10H8N2)][C11H10O5]

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