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• Anion-controlled structural similarity and diversity in one-dimensional cadmium coordination polymers. • Using 2-aminobenzonitrile ligand and different anions, two isostructral and two structurally different cadmium CPs were synthesized. • Shape and coordination ability of anions have key role in structural diversity. • Hirshfeld surface analysis was performed to investigate the intermolecular interactions. Using 2-aminobenzonitrile (2-ABN) and different anions, four one-dimensional coordination polymers of the formulae [Cd(2-ABN) 2 Br 2 ] n (1), [Cd(2-ABN) 2 I 2 ] n (2), [Cd(2-ABN)(H 2 O) (NO 3) 2 ] n (3), and {[Cd(2-ABN) 2 (H 2 O) 2 ](ClO 4) 2 } n (4) were synthesized and structurally characterized by FT-IR, PXRD, TGA, Elemental analysis and single-crystal X-ray diffraction. According to our structural analysis, the 2-aminobenzonitrile ligand can act as a monodentate and bridge µ 2 N,N′ ligand. In isostructural compounds 1 and 2 , the 2-ABN ligand was coordinated only through the N nitrile to the metal center and a 1D ribbon chain is obtained through bridged halide anions. While compound 3 and 4 includes 1D helical and double chain structural motif due to the (µ 2 N,N′) ligand coordination mode, respectively. Our results prove that anions can play an essential role in the final structural motif of cadmium coordination polymers. Also, Hirshfeld surface analysis was performed to investigate intermolecular interactions in compounds 1–4. [Display omitted] [ABSTRACT FROM AUTHOR]

• Anion-controlled structural diversity in cadmium coordination polymers. • Using 3-aminobenzonitrile ligand and different anions, three structurally different CPs were synthesized. • Size and coordination ability of anions have key role in structural diverssity. • Hirshfeld surface analysis was performed to investigate the intermolecular interactions. Using 3-aminobenzonitrile (3-ABN) as a ligand and different anions, three cadmium coordination polymers of the formulae [Cd(3-ABN)I 2 ] n (1), [Cd(3-ABN)Br 2 ] n (2), {[Cd(3-ABN) 2 (H 2 O) 2 ](ClO 4) 2 } n (3), were synthesized and characterized by FT-IR, PXRD, TGA as well as single-crystal X-ray analysis. Our results show that by changing the anions, different structural motifs were formed in compounds 1–3. Structural analysis shows that the 3-ABN ligand in all compounds plays the role of a bridge between cadmium centers. Compound 1 is a 1D double chain structural motif while compounds 2 and 3 form different 2D coordination polymers. Hirshfeld surface analysis was performed to investigate the intermolecular interactions in compounds 1–3. Using 3-aminobenzonitrile (3-ABN) and different anions, three coordination polymers of the formulas [Cd(3-ABN)I 2 ] n (1), [Cd(3-ABN)Br 2 ] n (2) and {[Cd(3-ABN) 2 (H 2 O) 2 ](ClO 4) 2 } n (3) were synthesized and characterized by FT-IR, PXRD, SC-XRD, and TG analysis. Compound 1 show a 1D double chain while compounds 2 and 3 form different 2D structural motif. [Display omitted] [ABSTRACT FROM AUTHOR]

The proximity of donor atoms in pyridylpyrazole ligand and the ability of such ligand to function in neutral as well as in deprotonated form allow it to produce a varied range of metal complexes. This review will highlight the chemistry of a large extension of pyridylpyrazole ligand derivatives as well as myriad of their complexes with core late transition metals spanning from Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd to Hg, that have received immense attention in the cutting-edge field of research. Emphasis on the synthetic strategy and diverse structural aspects of the promising metal complexes with a brief picture of their optical, magnetic, catalysis, etc. has been illustrated. Notably, this class of metal complexes with a great deal of structural diversity finds very interesting applications in the field of catalysis, supramolecular chemistry and photophysical chemistry. The influence of ligands on the physico-chemical properties of the complexes is ascribed to their varied coordination patterns to the metal centers. Image 10420 • Chemistry of pyridylpyrazole derived late transition metal complexes. • Focus on the various synthetic approaches of the complexes. • Emphasis on diverse structural features of the complexes. • Non-covalent interactions among complexes lead to atypical supramolecular networks. • Catalytic, magnetic, dye sensitizing and emission properties of selected metal complexes. [ABSTRACT FROM AUTHOR]

Based on the hydrolysates of N , N ′-bis(3,5-dicarboxylatophenyl)pyromelliticdi-imide) (H 4 L) and 1,3-bis(imidazol-1-ylmethyl)benzene (bimb), three coordination polymers, namely, {[Zn(BTC) 0.5 (bimb)]·4H 2 O} n ( 1 ), [Cu(BTC) 0.5 (bimb)] n ( 2 ), and {[Cd(AIP)(H 2 O)]·H 2 O} n ( 3 ), have been obtained under solvothermal conditions. The possible hydrolysis mechanism of H 4 L was investigated here. Structural analyses reveal that complex 1 is a 3D (4,4)-c {6 4 .8 2 }{6 6 } 2 - bbf net. Complex 2 displays a 2D 4-c {3 2 .6 2 .7 2 }- kgm sheet. While complex 3 exhibits a 3D (3,6)-c {4.6 2 } 2 {4 2 .6 10 .8 3 }- rtl net based on binuclear {Cd 2 (COO) 4 } SBUs. Besides, luminescent sensing investigation indicated that 1 and 3 exhibit highly sensitive and selective sensing of chromate anions in aqueous solution. [ABSTRACT FROM AUTHOR]

Four Cd/Zn coordination frameworks, namely, [Cd(TPBA-4)(NO 3 ) 2 ]·2DMF·1.22H 2 O ( 1 ), [Cd(TPBA-4)(NO 3 ) 2 ]·H 2 O ( 2 ), [Cd(TPBA-4)(NO 3 ) 2 ]·2.2Me 2 CO·0.32H 2 O ( 3 ), and [Zn(TPBA-4)(NO 3 ) 2 ]·1.5Me 2 CO ( 4 ) were synthesized by the reaction of N′,N″,N‴-tris(pyrid-4-ylmethyl)-1,3,5-benzenetricarboxamide (TPBA-4) with the corresponding d 10 metal salts. X-ray diffraction analysis revealed that complex 1 was of two-fold interpenetrated 2D network with interlocked cage-like motif. The structure of 2 is three-fold interpenetrated 2D honeycomb network. On the other hand, the 3 and 4 are isomorphous and isostructural, and have different 2D networks compared to 1 and 2 . Thus the series of complexes have the same metal atoms and ligands but different structures. In complex 1 , 2 , 3 , and 4 , the flexible TPBA-4 ligands are versatile and adopt different conformations according to different reaction conditions, which predominates the final structures of these complexes. The physical properties of these complexes were also investigated. [ABSTRACT FROM AUTHOR]

Intermolecular interactions involving organic fluorine have been the contemporary field of research in the area of organic solid state chemistry. While a group of researchers had refuted the importance of “organic fluorine” in guiding crystal structures, others have provided evidences for in favor of fluorine mediated interactions in the solid state. Many systematic studies have indicated that the “organic fluorine” is capable of offering weak hydrogen bonds through various supramolecular synthons, mostly in the absence of other stronger hydrogen bonds. Analysis of fluorine mediated interaction in the presence of strong hydrogen bonds has not been highlighted in detail. Hence a thorough structural investigation is needed to understand the role of “organic fluorine” in crystal engineering of small organic fluorinated molecules having the possibility of strong hydrogen bond formation in the solution and in the solid state. To fulfil this aim, we have synthesized a series of fluorinated amides using 3-methoxyphenylacetic acid and fluorinated anilines and studied their structural properties through single crystal and powder X-ray diffraction methods. Our results indicated that the “organic fluorine” plays a significant role in altering the packing characteristics of the molecule in building specific crystal lattices even in the presence of strong hydrogen bond. [ABSTRACT FROM AUTHOR]

• Two novel coordination polymers were successfully prepared. • The supramolecular architectures of two complexes are formed by π-π interactions. • Fluorescent property of complexes 1-2 in the solid-state was explored. • Adsorption studies show that complex 1 can effectively remove CR dye molecules. Two new complexes [Zn(oba)(bpyb) (H 2 O)] (1) and [Cu(oba)(Py 2 TTz)]·H 2 O·DMF (2) [H 2 oba=4,4′-Oxybis(benzoic acid), bpyb=1,4-bis(4-pyridyl)benzene and Py 2 TTz=2,5-di(pyridin-4-yl)thiazolo-[5,4-d]thiazole)] were synthesized. It is noteworthy that supramolecular architectures of two complexes are formed by π-π interactions. The photoluminescent properties of the ligands and complexes 1-2 in the solid-state were explored. In addition, the dye adsorption behavior of compound 1 was also studied and the adsorption kinetic data were well described by a pseudo-second-order model. The experimental results indicated that compound 1 is a promising adsorbent for Congo red (CR) dye removal from aqueous solution. [Display omitted] [ABSTRACT FROM AUTHOR]

• Complex 1 exhibits distorted square pyramidal geometry. • Hirshfeld surface analysis reveals the intermolecular interactions in complex 1. • DFT calculations have also been achieved. • MTT assays shows the cytotoxic potential of complex 1 against different cancer cell lines. • Docking studies decipher binding interactions of complex 1 with target protiens and DNA. We aimed to synthesize a new copper(II) complex, namely [Cu(H 2 IPA)(NC)(Cl)]⋅H 2 O (1) (where, H 3 IPA = 5-hydroxy isophthalic acid and NC = 2,9-dimethyl-1,10-phenanthroline or Neocuproine) as a promising chemotherapeutic agent. Complex 1 was structurally characterized by single-crystal X-ray diffraction (SCXRD), UV-Visible, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and powder X-ray diffraction (PXRD) methods. Single crystal diffraction analysis reveals that Cu(II) ion exists in a distorted square pyramidal geometry, with the ligation of a chloride ion, two oxygen atoms, and two nitrogen atoms. Topological structural simplification of complex 1 shows ins as an underlying net. The prominent intermolecular interactions and their quantitative contributions in complex 1 were investigated using Hirshfeld Surface (HS) analysis. The DFT calculations were also performed to validate the experimental results (XRD, FTIR, and UV-Visible). In vitro cytotoxicity of complex 1 was performed against acute myeloid leukemia (THP-1), colorectal (SW480), and prostate cancer (PC-3) cell lines by utilizing MTT assay. The result shows that complex 1 has the ability to inhibit the growth of cancer cells at a lower concentration. The morphological changes that occur during apoptosis were carried out with acridine orange/ethidium bromide (AO/EB) staining methods on THP-1 and SW480 cancer cell lines. Additionally, comprehensive molecular docking studies were performed to understand the potential binding interactions of complex 1 with target protein and DNA double helix. The cytotoxic potential of complex 1 was successfully accomplished against different cancer cell lines by utilizing MTT assay and fluorescence microscopy techniques. Further, molecular docking studies decipher potential binding interactions of complex 1 with target protein and DNA molecules. [Display omitted] [ABSTRACT FROM AUTHOR]

Four imidazolium iodocuprates, [(1,3-dimethylimidazole)(Cu 2 I 3 )] n ( 1 ), [(1,2,3-trimethylimidazole)(Cu 2 I 3 )] n ( 2 ), [(1,3-dimethylimidazole)(Cu 3 I 5 )] n ( 3 ) and [(1,3-dimethylbenzimidazole)(CuI 2 )] n ( 4 ) have been solvothermally synthesized and optically characterized. Results exhibit that cationic spatial orientation, anion–π and π–π interactions are beneficial to structural diversity and band gap modulation of iodocuprate hybrids. The UV–vis diffuse reflectance spectra show that compounds 1 – 4 are potential semiconductor materials. [ABSTRACT FROM AUTHOR]

By tuning the auxiliary ligands in the assembling reaction, three Zn II coordination polymers of [Zn(Cl-adc) (phen) (H 2 O)](DMF) ( 1 ), [Zn(Cl-adc) (DMA)](DMA) ( 2 ), and [Zn(Cl-adc) (dip)](DMF) 0.5 ( 3 ) (Cl–H 2 adc = 2,2′-dichloro-4,4′-azodibenzoic acid, phen = 1,10-phenanthroline, dip = 1,3-di(imidazole)propane) have been successfully synthesized and characterized by single-crystal X-ray diffraction study, elemental analysis, IR spectra, TGA analyses, solid-state fluorescent property, and powder X-ray diffraction (PXRD). Single crystal X-ray diffraction reveals that 1 and 2 displays a 1D polymeric chain and 2D sql layered net with the presence of chelated phen and terminal DMA ligands, respectively. By incorporating dip linker, 3 exhibits a 2D + 2D → 3D entangled network, with each 2D net portraying wavelike sql layered structure. Their structural divergences should be properly attributed to fact that, the structural topologies can be well regulated by using three auxiliary ligands incorparating different coordination function. [ABSTRACT FROM AUTHOR]

Three new silver(I) coordination compounds based on 2-ethyl-3-methylpyrazine (epyz), [Ag 2 (epyz)(pta] ( 1 ), [Ag 4 (epyz) 2 (ipa) 2 ] ( 2 ) and [Ag 8 (epyz) 4 (npa) 4 ] ( 3 , H 2 pta = o-phthalic acid, H 2 ipa = m-phthalic acid, H 2 npa = 1,4-napthalenedicarboxylic acid), have been synthesized and have been characterized by elemental analyses, IR spectra and single-crystal X-ray diffraction. Complex 1 shows a two-dimensional network comprising Ag 2 units linked by the organic ligands. In complex 2 , tetrahedral Ag 4 units are bridged by the organic linkers into a double-layer structure. In complex 3 , the chains with alternating Ag 3 and Ag 5 units are connected by the organic ligands into a three-dimensional framework. The structural diversity of these compounds and the Ag units is highly dependent on different carboxylates and the coordination modes of the epyz ligand. The thermal stabilities and photoluminescence behaviors of these complexes were also discussed. [ABSTRACT FROM AUTHOR]

Four new M(II)-coordination polymers, namely {[Cd( L )(BDC)]·(EtOH)·(DMF)} n ( 1 ), {[Zn( L )(BDC)]·(EtOH)·(DMF)} n ( 2 ), {[Cd 1.5 ( L ) 2 (BDC) 1.5 ]·0.5(MeOH)·0.5(H 2 O)} n ( 3 ), and [Zn( L )(BDC)] n ( 4 ) ( L = 1,2-bis[4-(pyridin-3-yl)phenoxy]ethane, H 2 BDC = 1,4-benzenedicarboxylic acid, DMF = N , N -dimethylformamide) have been synthesized, and they all were characterized by single-crystal X-ray analyses, IR spectra and element analyses. The structural diversity indicates that the different conformations of L ligand and various coordination modes of BDC ligand play a central role in determining the topological structures of 1–4 . In addition, the thermal stability and photoluminescent properties of 1–4 were investigated preliminary. [ABSTRACT FROM AUTHOR]

Highlights: [•] Three diverse 1D coordination polymers are constructed from a versatile tripyridyltriazole ligand and Cd(II) halides. [•] Different binding features of halide ions are observed to direct the structural assemblies. [•] Solid state fluorescent emissions of the complexes can also be regulated. [ABSTRACT FROM AUTHOR]

Highlights: [•] The structural sufficiency of tripeptides as multifunctional food additives is investigated. [•] Tripeptides can bind tightly to ACE and thus exert significant antihypertensive efficacy. [•] A good relationship between two desirable bioactivities of tripeptides is found. [•] Quite modest correlations of two desirable bioactivities with an undesirable property are observed. [Copyright &y& Elsevier]

Abstract: Three new CuII/3-sb/2,2′-bipy complexes, [Cu(2,2′-bipy)2(3-sb)]·4 H2O (1), {[Cu(2,2′-bipy)(3-sb)(H2O)2]·2. 5H2O} n (2), and {[Cu(2,2′-bipy)(3-sb)(H2O)]·2H2O} n (3), in addition to the our previously reported {[Cu(2,2′-bipy)(3-sb)(H2O)](H2O)} n (4) and [Cu(2,2′-bipy)2Cl](3-Hsb)·3H2O (5) [3-sb=3-sulfobenzoate dianion; 2,2′-bipy=2,2′-bipyridine], have been synthesized by hydrothermal reactions or the combination of hydrothermal reactions and solution evaporation. The molecular structure of complex 1 is a monomer in which the 3-sb monodentately coordinates to the CuII ion. Complexes 2–4 exhibit one-dimensional infinite chain structures in which the 3-sb ligands serve as bridges. Complex 5 is a cation–anion species in which the 3-Hsb is non-coordinating. Five complexes exhibit four coordination geometries, irregular geometry between square pyramid and trigonal bipyramid in 1, distorted octahedron in 2, square pyramid in 3–4, and trigonal bipyramid in 5. These complexes contain lattice and/or coordinated water molecules, therefore extensive hydrogen bonds occur. The extended hydrogen-bonding architectures are 1-D chains for 4 and 5, 2-D layers for 1 and 3, and 3-D network for 2. Complexes 3 and 4 have same crystal system and space group, and afford similar 1-D frameworks but have different lattice water molecules, therefore the addition lattice water molecule in complex 3 leads to more compact packing, longer metal–lattice water distance, and shorter Cu⋯Cu separation by 3-sb compared to those in complex 4. The fluorescent emissions of complexes 1–3 are stronger than those of ligands, indicating the coordination of 3-sb and 2,2′-bipyridine can enhance the emissions. [Copyright &y& Elsevier]

Abstract: Two structurally diverse complexes, [Cu4(CH3COO)2(ssal)2(2,2′-bipy)4(H2O)2]6H2O (1) and {[Cu(ssal)(2,2′-bipy)][Cu2(ssal)(2,2′-bipy)2(H2O)2](H2O)} n (2) [ssal=5-sulfosalicylate trianion; 2,2′-bipy=2,2′-bipyridine], have been strategically synthesized and characterized by elemental analyses, IR, fluorescent spectra, and single crystal X-ray analyses. The structure of complex 1 is a tetranuclear species where both the carboxyl and phenoxo chelate to the copper atom and the carboxyl also bridges two copper atoms, while complex 2 features a charge transfer species with two cationic and anionic chains, in which both the carboxyl and sulfonyl are coordinated to copper atoms. Fluorescent properties of complexes 1 and 2 suggest interesting potential applications in photoactive materials. [Copyright &y& Elsevier]

2,6-Diformyl-p-cresol serves as a starting point for the generation of multidentate N/O/S chelating agents. Condensation with 4-(X-phenyl) thiosemicarbazide yields the pentadentate ligand having SNONS donor sequences, capable of holding two metal ions in close proximity. The ligands behave as mono/di/tri basic depending on the pH of the medium. Stereochemical diversity in the reaction product of such ligands with nickel(II) chloride at different pH is observed. Sterically demanding substituted ligands in association with various exogenous bridges dictate the geometry and coordination number of such complexes. The compounds were investigated by elemental analysis, molar conductivities, electronic spectra, IR, NMR, FAB mass spectra, TG-DTG, magnetic susceptibility measurements. Varieties of geometries such as square planar, square pyramidal, octahedral and square planar–square pyramidal are observed. Cryomagnetic data for the complexes (79–296 K) can be reproduced by an equation based on the Heisenberg model (H=−2JS1S2, S1=S2=1). The singlet–triplet splitting, J varies systematically with the coordination geometry about the Ni2(SNONS) core, with the hydroxo bridged complex exhibiting the greatest degree of antiferromagnetic coupling. The coupling is somewhat weaker for the chloro-bridged complexes. None of the complexes have shown any appreciable antimicrobial activity. [Copyright &y& Elsevier]

• Two different structural frameworks have been designed. • Photocatalytic studies show that 1 and 2 exhibits efficient degradation activity of organic dye methyl violet. • The possible mechanism of the photocatalytic property has been deduced. The self-assemble of flexible ligand 5,5ˊ-(4,4ˊ-phenylenebis(methyleneoxy)) diisophthalic acid (H 4 L) and N-donor ligands with the different molecular size, 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (bpz) and 1,10-phenanthroline (phen), has generated two new coordination polymers, [Co(L) 0.5 (bpz)·2.5H 2 O] n (1) and [Mn(H 2 L)(phen)] n (2). 1 has a 3D twofold interpenetrated 2-nodal 4,4-c network with a Schläfli symbol of (64.82)(66) 2 topology, while 2 exhibits a 2-D grid net, which is further afforded 3D supramolecular motif through π ̶ π interactions with 3.65 Å between adjacent phen linkers. The influences of various N-donor ligands in assembly of flexible polymers accompany with H 4 L are also summarized. Photocatalytic studies show that 1 and 2 exhibits efficient degradation activity of organic dye methyl violet (MV). Meanwhile, the possible mechanism of the photocatalytic property has been deduced. Complexes 1 and 2 exhibits efficient degradation activity of organic dye methyl violet, meanwhile, the possible mechanism of the photocatalytic property has been deduced Image, graphical abstract. [ABSTRACT FROM AUTHOR]

A series of new metal coordination polymers constructed from a novel asymmetric semi-rigid aromatic carboxylate ligand, namely, {[M 2 L·5H 2 O]∙2H 2 O} n ((M = Zn, and Cd for 1 and 2, respectively), {[Zn 2 (L)(bipy)(H 2 O) 2 ·3H 2 O} n (3), and {[Zn(HL)(Habpt)(H 2 O) 2 2 ·5H 2 O} n (4) (H 4 L = 4-((3,5-dicarboxyphenyl)carbamoyl)phthalic acid; bipy = 4,4′-bipyridine; abpt = 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole), have been hydrothermally synthesized and characterized by elemental analysis, infrared spectra, and single-crystal X-ray diffraction. Both compounds 1 and 2 present three-dimensional coordination networks. Compound 3 forms a two-dimensional layer structure whereas 4 displays a one-dimensional (1D) chain structure built from both Habpt ligand and HL3− ligand, which further extend into three-dimensional network via hydrogen bonds. The versatile structures of the title polymers indicate that structural diversity may be influenced by various factors, such as the coordination mode of ligands, the nature of metal nodes and the kind of ancillary ligand. Additionally, the photoluminescence of 1 – 4 were also investigated. Image 1 • Four new coordination polymers have been constructed from a new semi-rigid tetracarboxylate ligand and N-donor ligands. • The compounds exhibit diverse structures vary from 1D chain to 3D frameworks. • The luminescent properties are investigated systematically. [ABSTRACT FROM AUTHOR]