Fatima Klongdee’s research while affiliated with Khon Kaen University and other places

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Publications (9)


Structural transformation and magnetic properties of Co(II) coordination polymers with pyrazole-3,5-dicarboxylate and pyrazine
  • Article

June 2023

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44 Reads

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2 Citations

Inorganica Chimica Acta

Fatima Klongdee

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Yuto Sasada

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[...]

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Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(II) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands

January 2023

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32 Reads

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4 Citations

New Journal of Chemistry

A series of polynuclear Cu(II) complexes, namely, (Him)2[Cu2(pzdc)2(H2O)2] (1), [Cu3(pzdc)2(im)2(H2O)4] (2), {[Na4Cu4(pzdc)4(im)4(H2O)2]·16H2O}n (3), (Hamp)2[Cu2(pzdc)2(H2O)2] (4), (H2tmdp)2[Cu4(pzdc)4(H2O)2]·2H2O (5), {[Cu2(pzdc)2][Cu(H2O)6]}n (6), and [Cu3(pzdc)2(en)2(H2O)2]n (7) were successfully synthesized under the reaction of Cu(NO3)2∙3H2O,...


Variations in the structural composition of pyrazole-3,5-dicarboxylato Cu(II) complexes with 1,2-di(4-pyridyl)ethane synthesized under different conditions

January 2023

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36 Reads

CrystEngComm

The reaction of Cu(II) and pyrazole-3,5-dicarboxylic acid (H3pzdc) and 1,2-di(4-pyridyl)ethane (bpa) under various temperatures and solvents results in the formation of new seven Cu(II) complexes, namely, [Cu2(pzdc)2(H2O)2](H2bpa)(H2O)6 (1), [Cu2(pzdc)2(H2O)2](H2bpa)(H2O)4 (2),...


SEM images of 1 prepared by (a) the layering method and (b) the sonochemical method
(a) The trinuclear Cu(ii) complex of 1 with atom labeling scheme. The ellipsoids are shown at 50% probability level. All hydrogen atoms are omitted for clarity (symmetry code: A = 1 − x, 1 − y, 1 − z). (b and c) 3D packing diagram of 1 built by hydrogen bonds and π–π stacking interactions
Color responses of 1 induced by the dehydration and rehydration process and different solvents
PXRD patterns of 1 after the dehydration and rehydration process
PXRD patterns of 1, MeOH@1, and 1′

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Sonochemical synthesis of a trinuclear Cu( ii ) complex with open coordination sites for the differentiable optical detection of volatile amines
  • Article
  • Full-text available

March 2021

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65 Reads

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12 Citations

A discrete trinuclear Cu(ii) complex, namely, [Cu3(pzdc)2(dpyam)2(H2O)4] (1) (H3pzdc = pyrazole-3,5-dicarboxylic acid, dpyam = 2,2'-dipyridylamine) was simply synthesized by the sonochemical process and structurally characterized. The single-crystal X-ray diffraction analysis revealed that three adjacent Cu(ii) centers are linked via two bridging pzdc ligands to form a trinuclear Cu(ii) unit. Each trinuclear Cu(ii) unit contains open coordination sites with two trigonal bipyramidal Cu(ii) centers and one elongated octahedral geometry. Moreover, the open coordination site of 1 was occupied by a small molecule, leading to the guest-induced structural transformation with chromism that was verified by FT-IR, UV-vis diffuse reflectance spectra, elemental analysis, PXRD, and SEM techniques. Compound 1 exhibits color change along with structural transformation in methanol media and after the dehydration process. Also, 1 shows different color responses after exposure to different amine vapors. In addition, compound 1 was conveniently deposited onto a filter paper by a sonochemical method used as a portable test strip for the discriminative qualitative detection of amines.

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A luminescent sensor based on zinc(II) 1D chain coordination polymer for effective acetone detection

February 2020

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80 Reads

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9 Citations

Polyhedron

A novel Zn(II) coordination polymer, namely, [Zn(Hpzdc)(ncp)]n (1) was synthesized by the reaction of zinc(II), pyrazole-3,5-dicarboxylic acid (H3pzdc), and neocuproine (ncp) at ambient temperature. The single-crystal X-ray diffraction analysis revealed that each tetrahedral Zn(II) center is assembled by Hpzdc linker exhibiting 1D zigzag-like chain coordination polymer. The interchain hydrogen bonding and π-π stacking interactions stabilize a 3D supramolecular framework of 1. The photoluminescence in solid state and suspension of 1 exhibits blue emission at 418 nm. Moreover, the ethanolic suspension of 1 can be used to selectively detect acetone through the luminescent quenching (turn-off) process within 30 s. Compound 1 displays low detection limit (LOD) of 0.016 vol% without the interference of competitive solvents. Also, compound 1 can be reusable for three times.


Effect of pH on the charge-assisted hydrogen-bonded assembly of the anionic [Cu(oxalate)2] building unit and N,N′-ditopic cations

February 2018

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30 Reads

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3 Citations

By the solvothermal reaction under acidic conditions of Cu(NO3)2·3H2O, Na2C2O4 and the N,N′-ditopic organic coligands 1-(pyridin-4-yl)piperazine (ppz) and 1,2-bis­(pyridin-4-yl)ethane (bpa), two novel anionic copper(II) coordination compounds were obtained, namely the one-dimensional coordination polymer catena-poly[4-(pyridin-1-ium-4-yl)piperazin-1-ium [[(oxalato-κ²O¹,O²)copper(II)]-μ-oxalato-κ³O¹,O²:O1′]], {(C9H15N3)[Cu(C2O4)2)]}n or {(H2ppz)[Cu(C2O4)2]}n, (I), and the discrete ionic complex 4,4′-(ethane-1,2-di­yl)di­pyridinium bis­(oxalato-κ²O¹,O²)copper(II), (C12H14N2)[Cu(C2O4)2] or (H2bpa)[Cu(C2O4)2], (II). The products were characterized by single-crystal X-ray diffraction, elemental analysis, powder X-ray diffraction, thermogravimetric analyses and UV and IR spectroscopic techniques. The [Cu(C2O4)2]²⁻ units for (I) and (II) are stabilized by H2ppz²⁺ and H2bpa²⁺ cations, respectively, via charge-assisted hydrogen bonds. Also, a study of the pH-controlled synthesis of this system shows that (I) was obtained at pH values of 2–4. When using bpa, a two-dimensional square-grid network of [Cu(C2O4)(bpa)]n was obtained at a pH of 4. This indicates that the pH of the reaction also plays a key role in the structural assembly and coordination abilities of oxalate and N,N′-ditopic coligands.


Anion-dependent self-assembly of copper coordination polymers based on pyrazole-3,5-dicarboxylate and 1,2-di(4-pyridyl)ethylene

March 2017

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63 Reads

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17 Citations

Dalton Transactions

By utilizing a pyrazole-3,5-dicarboxylic acid (H3pzdc) and flexible 1,2-di(4-pyridyl)ethylene (dpe) with various copper(ii) salts under the same solvothermal synthetic conditions, six novel coordination polymers, namely, {[Cu2(pzdc)(dpe)2]X}n (X = NO3(-) (1), ClO4(-) (2), BF4(-) (3), SCN(-) (4)), {[Cu(ii)4Cu(i)4(pzdc)4(dpe)6](H2O)4}2n (5), and {[Cu5(HPO4)2 (pzdc)2(dpe)3](H2O)5}n (6) were obtained. The structural diversity of compounds 1-6 depends on the starting Cu(ii) salts. Compounds 1-4 are isostructural and exhibit a 3D porous cationic pillar-layered coordination framework with lattice monoanions incorporated into the channels of the framework. When using copper(ii) sulfate as a reagent, a neutral mixed-valence Cu(i,ii) 2D + 2D ? 2D parallel interpenetrated layer of 5 was obtained. In the case of a phosphate trianion, compound 6 shows a 3D coordination framework which contains ?4-HPO4(2-) linking between Cu(ii) centers. The anion-exchange properties of 1-4 were studied. Interestingly, compounds 1-4 exhibit the irreversible chemisorption of the thiocyanate anion instead of anion exchange without the destruction of their structural framework as confirmed by PXRD, IR, UV-Vis, and AA spectroscopy. Moreover, the anion-induced structural transformation of 1-4 was observed when exchanging with an azide anion. The luminescent properties of 1-6 and exchanged products were also investigated.


Copper(II) coordination polymers containing neutral trinuclear or anionic dinuclear building units based on pyrazole-3,5-dicarboxylate: Synthesis, structures and magnetic properties

January 2017

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34 Reads

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14 Citations

Polyhedron

Four novel copper(II) coordination polymers, namely {[Cu3(pzdc)2(pyz)(H2O)6](H2O)}n (1), {[Cu3(pzdc)2(bpy)(H2O)8](H2O)6}n (2), {[Cu4(Hpzdc)2(pzdc)2(bpy)2][Cu(bpy)(H2O)4]n(H2O)4}n (3), and {[Cu3(pzdc)2(ampy)(H2O)5](H2O)3}n (4) (H3pzdc = pyrazole-3,5-dicarboxylic acid, pyz = pyrazine, bpy = 4,4΄-bipyridine and ampy = 2-aminopyrazine) were synthesized and characterized. Compounds 1, 2 and 4 were synthesized by layering method at room temperature while 3 was prepared under solvothermal reaction. Compounds 1 and 2 are one-dimensional (1D) chain coordination polymers, while 3 shows 1D cationic chain coordination polymer with anionic tetranuclear Cu(II) cluster. Compound 4 exhibits 1D ladder-like chain structure. Compounds 1, 2 and 4 consist of neutral trinuclear [Cu3(pzdc)2] building unit which is constructed by μ2-pzdc³⁻ bridging (5-6-5), (6-6-6), and (6-5-5) sequences of Cu(II) geometries for 1, 2 and 4, respectively. Each trinuclear unit is extended via N,N΄-linkers giving polymeric chain structure. In contrast, anionic tetranuclear cluster of 3 is built up from two anionic dinuclear metallacyclic [Cu2(Hpzdc)(pzdc)]¯ building units and double μ2-bpy spacers. The magnetic properties of 1, 2 and 4 exhibit weak antiferromagnetic interactions among Cu(II) centers.


A Series of Cyanoacetato Copper(II) Coordination Polymers with Various N,N′-Ditopic Spacers: Structural Diversity, Supramolecular Robustness, and Magnetic Properties

July 2015

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37 Reads

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9 Citations

Crystal Growth & Design

Five novel copper(II) coordination polymers containing cyanoacetate (cna) anion with various N,N′-ditopic spacers [Cu(cna)2(pyz)]n (1), [Cu(cna)2(bpy)(H2O)2]n (2), [Cu(cna)2(dpe)]n (3), [Cu(cna)2(dpe)]n(H2O)n (4), and [Cu(cna)2(bpa)]n (5) (when pyz = pyrazine, bpy = 4,4′-bipyridyl, dpe = 1,2-di(4-pyridyl)ethylene, and bpa = 1,2-di(4-pyridyl)ethane) were structurally and spectroscopically characterized. Compound 1 shows a two-dimensional (2D) sheet structure constructed from μ2-1,3(syn,anti) coordinative mode of cyanoacetate and μ2-pyz linking adjacent Cu(II) centers. Compound 2 exhibits a one-dimensional (1D) polymeric chain which is formed by μ2-bpy bridging between [Cu(cna)2(H2O)2] units, whereas compounds 3-5 reveal 1D ladder-like structures which are built from double-μ2-dpe/bpa spacers connecting neighboring Cu(II) cyanoacetate dimers. Weak interactions such as hydrogen bonding and N···π and/or C-H···π interactions join the adjacent layers of 1 or polymeric chains of 2-5 to stabilize overall supramolecular networks. The thermal stabilities of 1-5 were investigated. Interestingly, compound 2 reveals a robust supramolecular framework constructed by 1D polymeric chains during thermal dehydration and rehydration processes, which has been further verified by spectroscopic techniques, elemental analyses, thermogravimetric analysis, and X-ray powder diffraction. Moreover, this behavior is not observed in the isomorphous series containing Co(II) and Ni(II) ions. The magnetic properties of 1 and 3 exhibit very weak antiferromagnetic interactions between Cu(II) centers.

Citations (6)


... Unlike Cu1(II), Cu2(II) is tetra-coordinated, bonded with four O-atoms (O3, O2 3/2−x,−1/2+y,1/2−z , O2 1/2+x,−1/2+y,z , O3 2−x,y,1/2−z ). The bond lengths are comparable to the reported H 3 PDCbased crystal structures [9][10][11]. It is worth noting that the hydrogen atom belonging to the nitrogen atom (N1 or N2) of the ligand is also deprotonated. ...

Reference:

Crystal structure of polybis( μ 4 -3,5-dicarboxylatopyrazol-1-yl)-bis( N , N -dimethylformamide)tri-copper(II)–acetonitrile (1/2), C 20 H 22 Cu 3 N 8 O 10
Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(II) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands
  • Citing Article
  • January 2023

New Journal of Chemistry

... In this context, an important issue is the capability to distinguish and sensitively detect volatile aliphatic diamine vapors from monoamines. In this regard, several recent contributions have been reported for the optical detection of volatile aliphatic diamine vapors [29][30][31][32][33][34][35][36], some focused on their discriminative detection [37][38][39][40][41][42][43][44][45][46], while a few examples also concern their sensitive detection [47][48][49][50]. ...

Sonochemical synthesis of a trinuclear Cu( ii ) complex with open coordination sites for the differentiable optical detection of volatile amines

... 21 World Health Organization determined that prolonged exposure to acetone gas (>2.98 mM) causes dermatitis, eye irritation, skin dryness, throat, cornea or metabolism malfunction, and respiratory and kidney diseases. [17][18][19]22 The medical research conrmed that acetone is a biomarker for type-1 diabetes in which the deciency of insulin in the pancreas induces the body cells to fatty acids breakdown and produce acetone rather than react with glucose. 18,23 Various techniques have been used for the detection of acetone as acetone vapor detectors such as screen-printed TiO 2 nanoparticles, silicon doped WO 3 NPs, MoO-CdO NPs, and ZnO nanoowers. ...

A luminescent sensor based on zinc(II) 1D chain coordination polymer for effective acetone detection
  • Citing Article
  • February 2020

Polyhedron

... The broad peak at 2500 cm −1 was attributed to the O−D stretching vibration of D 2 O. 46 The peaks at 3307 cm −1 (Figure S3a,c) and 3315 cm −1 ( Figure S3b) were attributed to the N−H stretching vibration of amide A. The peak of FmocFF/BPE has blue-shifted a bit relative to the peaks of FmocFF and FmocFF/APE, probably due to the greater impact of BPE on the N−H group than APE. 47 The peaks at 1603 cm −1 in Figure S3b and 1595 cm −1 in Figure S3c were attributed to the pyridine stretching vibration, 48,49 which had blue-shifted with time, indicating its enhanced hydrogen bonding. Three bands of around 1689 cm −1 , 1654 cm −1 , and 1605 cm −1 were attributed to β-sheet, 50,51 whose intensities increased with time. ...

Anion-dependent self-assembly of copper coordination polymers based on pyrazole-3,5-dicarboxylate and 1,2-di(4-pyridyl)ethylene
  • Citing Article
  • March 2017

Dalton Transactions

... In particular, polynuclear metal compounds often display unique structural features and combine physical properties (magnetism, luminescence, etc.) that cross the boundaries between a variety of research areas, including bioinorganic chemistry, drug discovery, catalysis, molecular magnetism, and others. In regard to the latter, the discovery that the paramagnetic metal complexes have the potential to possess magnetic properties in the absence of an external magnetic field at very low temperature, i.e., exhibiting single molecule magnetism (SMM) behaviour, With the above in mind, we decided to explore further the reaction mixture of 2pyridyl oximes and polycarboxylic acids, and, in particular, we introduced isonicotinic acid (pyridine-4-carboxylic acid) [53][54][55][56][57][58][59][60][61][62][63][64][65] and 3,5-pyrazole dicarboxylic acid [66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85] to the reaction system (Scheme 1). Both carboxylic acids have been extensively investigated in the field of coordination compounds, and they have been proven a fruitful source of discrete metal complexes and coordination polymers; yet their combination with oximic ligands remains unexplored. ...

Copper(II) coordination polymers containing neutral trinuclear or anionic dinuclear building units based on pyrazole-3,5-dicarboxylate: Synthesis, structures and magnetic properties
  • Citing Article
  • January 2017

Polyhedron

... Computer programs: SMART (Bruker, 2008), SHELXTL (Bruker, 2008), SHELXS97 (Sheldrick, 2008) and SHELXL97 (Sheldrick, 2008). Adjacent staircases are arranged in a two-dimensional herringbone arrangement stabilized by C-HÁ Á Á interactions (Suvanvapee et al., 2015) in the bc plane (Fig. 1b). These layers are held together by C-HÁ Á ÁO interactions (Figs. ...

A Series of Cyanoacetato Copper(II) Coordination Polymers with Various N,N′-Ditopic Spacers: Structural Diversity, Supramolecular Robustness, and Magnetic Properties
  • Citing Article
  • July 2015

Crystal Growth & Design