Manganese complexes and manganese-based metal-organic frameworks as contrast agents in MRI and chemotherapeutics agents: Applications and prospects.

Manganese-based Metal-organic Frameworks (Mn-MOFs) represents a unique sub-class of MOFs with low toxicity, oxidative ability, and biocompatibility, which plays vital role in the application of this class of MOFs in medical field. Mn-MOFs show great potential in biomedical applications, and has been extensively studied as compared to other MOFs in transition metal series. They are important in medical applications because Mn(II) possess large electron spin number and longer electron relaxation time.

Determination and assessment of elemental concentration in the atmospheric particulate matter: a comprehensive review.

The elemental concentrations of atmospheric particulate matter (PM) have a detrimental effect on human health in which some elemental species have carcinogenic nature. In India, significant variations have found in the practices adapted from sampling to analysis for the determination and assessment of the elemental concentration in PM. Therefore, Indian studies (2011-2020) on the related domain are summarized to impart consistency in the field and laboratory practices.

Acid-assisted hydrogenation of CO to methanol using Ru(II) and Rh(III) RAPTA-type catalysts under mild conditions.

A highly efficient homogeneous catalyst system for production of CH3OH from CO2 using single molecular defined ruthenium and rhodium RAPTA-type catalysts [Ru(η6-p-cymene)X2(PTA)] (X = I(1), Cl(2); PTA = 1,3,5-triaza-7-phosphaadamantane) and rhodium catalysts [Rh(η5-C5Me5)X2(PTA/PTA-BH3)] (X = Cl(3), H(4) and PTA-BH3, H(5)) developed in acidic media under mild conditions. A TON of 4752 is achieved using a [Ru(η6-p-cymene)I2(PTA)] catalyst which represents the first example of CO2 hydrogenation to CH3OH using single molecular defined Ru and Rh RAPTA-type catalysts.

Transition-metal complexes of group 12 with 1,1'-bis(phosphanyl)ferrocene ligands.

The syntheses of four new cadmium and zinc complexes with 1,1'-bis(phosphanyl)ferrocene ligands and their phosphine chalcogenide derivatives are reported. The complexes were characterized by elemental analyses and IR, H NMR, P NMR and electronic absorption spectroscopy. The crystal structures of dichlorido[1-diphenylphosphinoyl-1'-(di-tert-butylphosphanyl)ferrocene-κO,P]cadmium(II), [CdCl{(CHOP)(CHP)Fe}] or CdCl(κP,O-dppOdtbpf) (1), bis[μ-(tert-butyl)(1'-diphenylphosphinoylferrocen-1-yl)phosphinato-κO,O':O'']bis[chloridozinc(II)], [Zn{(CHOP)(CHOP)Fe}Cl] or [ZnOCl{κO,O'-PhPOFcPO(t-Bu)}] (2), 1,1'-bis(di-tert-butylthiophosphinoyl)ferrocene, [Fe(CHPS)] or dtbpfS (3), and [1,1'-bis(dicyclohexylphosphanyl)ferrocene-κP,P'][chlorido/cyanido(0.

Copper(I) Complexes Containing PCP Ligand Catalyzed Hydrogenation of Carbon Dioxide to Formate under Ambient Conditions.

The five new copper(I) complexes [Cu(μ-Cl)(κ-PCP)] (), [Cu(μ-Br)(κ-PCP)] (), [Cu(μ-I)(κ-PCP)] (), [Cu(μ-CN)(κ-PCP)] (), and [Cu(μ-SCN)(κ-PCP)]·CHCl () bearing a 1,3-bis[(di--butylphosphino)methyl]benzene ligand were synthesized and characterized spectroscopically, and the molecular structures of , , and were determined by single-crystal X-ray diffraction techniques. Structural studies for and revealed their binuclear structures with Cu···Cu separations of 2.609(3) and 2.

A highly active copper catalyst for the hydrogenation of carbon dioxide to formate under ambient conditions.

Carbon dioxide (CO2) is an important reactant and can be used for the syntheses of various types of industrially important chemicals. Hence, investigation concerning the conversion of CO2 into valuable energy-rich chemicals is an important and current topic in molecular catalysis. Recent research on molecular catalysts has led to improved rates for conversion of CO2 to energy-rich products such as formate, but the catalysts based on first-row transition metals are underdeveloped.

Design of Metal-Organic Frameworks for pH-Responsive Drug Delivery Application.

Metal-Organic Frameworks (MOFs) have aroused great interest in the field of nanoscience and nanotechnology particularly in biomedical domains, such as Drug Delivery System (DDS), Biomedical Imaging (BI) and Photodynamic Therapy (PDT). As an emerging material, MOFs possess extraordinarily high surface area, controllable particle size and good biocompatibility. With extraordinary flexibility in the selection of organic and inorganic components, MOFs can rationally be tuned to obtain the materials having versatile structures and porosities.

Photocatalytic and Ferric Ion Sensing Properties of a New Three-Dimensional Metal-Organic Framework Based on Cuboctahedral Secondary Building Units.

A new three-dimensional microporous metal-organic framework based on Zn(II) clusters with the formula {[Zn(NDC)(μ-OH)]·7DMF} () (HNDC = 1,4-naphthalenedicarboxylic acid) had been synthesized and characterized. The MOF displays an uncommon bsn topology, which is based on a unique heptanuclear Zn(OH)(CO) cluster as a secondary building unit. The MOF had been employed as a photocatalyst for the photodegradation of model organic dyes rhodamine B and methyl violet in light.

Synthetic, spectral, structural and catalytic activity of infinite 3-D and 2-D copper(ii) coordination polymers for substrate size-dependent catalysis for CO conversion.

Two copper(ii) coordination polymers, viz. [Cu2(OAc)4(μ4-hmt)0.5]n (1) and [Cu{C6H4(COO-)2}2]n·2C9H14N3 (2), have been synthesized solvothermally and characterized.

A New 3D 10-Connected Cd(II) Based MOF With Mixed Ligands: A Dual Photoluminescent Sensor for Nitroaroamatics and Ferric Ion.

The precise unification of functional groups and photoluminescence properties can give rise to MOFs that can offer diverse applications like selective detection of nitroaromatic compounds (NACs) which are considered to be an important ingredient of explosive as well as cation and anion sensing. Hence, a new 3D metal-organic framework (MOF) [Cd(btc)(bib)(HCOO)(HO)·HO] () has been synthesized using mixed ligand strategy by solvothermal reaction of cadmium acetate with two ligands . 1,3,5-benzenetricarboxylic acid (Hbtc) and 1,4-bis(2-methyl-imidazol-1-yl)butane (bib).

The utilization of a stable 2D bilayer MOF for simultaneous study of luminescent and photocatalytic properties: experimental studies and theoretical analysis.

A new Pb(ii)-based 2D MOF comprising π-conjugated ligand 4'-(1-tetrazol-5-yl)-[1,1'-biphenyl]-3,5-dicarboxylic acid (TZBPDC) and having the formula {[PbNa(TZBPDC)](HO)(DMF)} (1) has been synthesized. Structural characterization of 1 indicates that the MOF has a 4-connected (4,4) motif. The photoluminescent investigation indicates that 1 can behave as potential luminescent sensor for the detection of nitroaromatic compounds (NACs), especially 2,4-dinitrophenol (2,4-DNP) and ferric ions, through the decrease in its luminescence intensity.

A ternary Fe(ii)-terpyridyl complex-based single platform for reversible multiple-ion recognition.

Multiple ion-recognition activity by a ternary Fe(ii)-terpyridyl complex, [Fe(PhT)(PT)]2+ (1) (PhT = 4'-phenyl-2,2':6',2''-terpyridine; PT = 4'-pyridyl-2,2':6',2''-terpyridine), is demonstrated for cyanide (CN-), fluoride (F-) and hydroxide (OH-) ions in an aqueous medium with sufficient sensitivity, fast response, reproducibility and selectivity with a dual optical read-out. The sensing event was reversible with the "by-eye" visualization of back and forth colour changes. Three cyanide ions replaced PT from 1, as observed from the crystal structure of the 1 + CN- couple.

1,1'-Bis(di-tert-butylphosphino)ferrocene copper(I) complex catalyzed C-H activation and carboxylation of terminal alkynes.

Four copper(i) complexes, [CuBr(dtbpf)] (1), [CuI(dtbpf)] (2), [Cu4(μ2-I)2(μ3-I)2(μ-dtbpf)2] (3) and [Cu6(μ3-I)6(μ-dtbpf)2]·2CH3CN (4), were prepared using CuX (X = Br, I) and 1,1'-bis(di-tert-butylphosphino)ferrocene (dtbpf). These complexes have been characterized by elemental analyses, IR, (1)H and (31)P NMR, ESI-MS and electronic absorption spectroscopy. Molecular structures of the complexes 2 and 4 were determined crystallographically.

Synthesis, characterization and light harvesting properties of Sb(III) and Bi(III) ferrocenyl dithiocarbamate complexes.

New Sb(III) and Bi(III) ferrocenyl dithiocarbamate complexes viz. [Sb(FcCH2Bzdtc)3] (Sb) and [Bi(FcCH2Bzdtc)3] (Bi) (Fc=C5H5FeC5H4-; Bz=C6H5CH2-) have been synthesized and characterized by elemental analyses, IR, (1)H and (13)C NMR spectroscopies. The optical, electrochemical and photovoltaic properties of the synthesized complexes were investigated.

Syntheses, characterization, and structural studies of copper(I) complexes containing 1,1'-bis(di-tert-butylphosphino)ferrocene (dtbpf) and their application in palladium-catalyzed Sonogashira coupling of aryl halides.

Four copper(I) complexes [Cu4(μ3-Cl)4(μ-dtbpf)2] (1), [Cu6(μ3-Br)4(μ2-Br)2(μ-dtbpf)3] (2), [Cu4(μ2-I)2(μ3-I)2(μ-dtbpf)2] (2) and [Cu2(μ1-CN)2(κ(2)-dtbpf)2] (4) were prepared using CuX (X = Cl, Br, I, CN) and 1,1'-bis(di-tert-butylphosphino)ferrocene (dtbpf) in 2 : 1 molar ratio in DCM-MeOH (50 : 50 V/V) at room temperature. These complexes were characterized by elemental analyses, IR, (1)H and (31)P NMR, ESI(+)-MS and electronic absorption spectroscopy. Molecular structures of the complexes 1,2 and 3 were determined crystallographically.

A fast and selective probe for monitoring Pd(2+) in aqueous medium via the dual-optical readout.

A ready-to-use coordinative probe has been outlined for the detection of Pd(2+) at parts-per-million (ppm) levels which potentially meets real-world-challenges through a simple synthetic route, water based-activity, fast response, by-eye visualization, regenerative-action, high selectivity and the dual-optical readout for precise quantification.

A thiocyanato-bridged copper(I) cubane complex and its application in palladium-catalyzed Sonogashira coupling of aryl halides.

Reaction of copper(I) thiocyanate with 1,1'-bis(di-tert-butylphosphino) ferrocene (dtbpf) in a 2:1 molar ratio in DCM-MeOH (50:50 V/V) afforded a tetranuclear copper(I) complex [Cu4(μ3-SCN)4(κ(1)-P,P-dtbpf)2] (1) with a cubane-like structure. Complex 1 was shown to be an efficient catalyst in comparison to CuI in the Sonogashira reaction. The coupling products were obtained in high yields by using Pd loadings of 0.

Synthesis, characterization and light harvesting properties of nickel(II) diimine dithiolate complexes.

Four Ni(II) diimine dithiolato complexes viz. [Ni{(S2C2Ph2)(1,10-Phenanthroline)}] (2), [Ni{(S2C2Ph2)(3,3'-dicarboxy-2,2'-bipyridyl)}] (3), [Ni{(S2C2Ph2)(4,4'-dicarboxy-2,2'-bipyridyl)}] (4) [Ni{(S2C2Ph2)(2,2'-bipyridyl)}] (5) have been prepared from [Ni(S2C2Ph2)2] (1) and characterized by microanalyses, UV-Vis, IR, (1)H and (13)C NMR. Attempts have been made to explain the nature of charge transfer in these molecules through quantum chemical calculations.

Application of π-extended ferrocene with varied anchoring groups as photosensitizers in TiO2-based dye-sensitized solar cells (DSSCs).

Two new compounds, FcCH=NC(6)H(4)COOH (1) and FcCH=NCH(2)CH(2)OH (2) (Fc=C(5)H(4)FeC(5)H(5)), have been synthesized and characterized by elemental analyses, IR and (1)H NMR spectroscopy, and ESI-MS. Attempt has been made to explain their quasi-reversible redox behavior evidenced by cyclic voltammetry using density functional theory (DFT) calculations. Light-harvesting properties of both the compounds and also the starting material, FcCHO (3), have been studied using these compounds as photosensitizers in TiO(2)-based dye-sensitized solar cells having either a propylene carbonate-based electrolyte or ionic liquid electrolyte, namely, 1-propyl-3-methyl imidazolium iodide (PMII).

catena-Poly[[(pyridine-κN)copper(II)]-μ(3)-pyridine-2,6-dicarboxylato-κO:O,N,O:O].

In the title compound, [Cu(C(7)H(3)NO(4))(C(5)H(5)N)](n), the Cu(II) atom is in a slightly distorted octa-hedral coordination environment. Each Cu(II) atom is bound to two N atoms and one O atom of the pyridine-dicarboxyl-ate (PDA) ligand in a tridentate manner, one N atom of the pyridine mol-ecule and two bridging carboxyl-ate O atoms of adjacent PDA ligands, leading to a linear one-dimensional chain running along the c axis. These chains are further assembled via weak C-H⋯O and π-π inter-actions into a three-dimensional supra-molecular network structure.

Dioxidobis(2-oxo-1,2-dihydropyridin-3-olato)-molybdenum(VI).

In the title compound, [Mo(C(5)H(4)NO(2))(2)O(2)], the Mo(VI) atom exhibits a distorted octa-hedral coordination geometry formed by two terminal oxo ligands and two monoanionic O,O-bidentate pyridinone ligands. The two terminal oxo ligands lie in a cis arrangement, the ketonic O atoms of the pyridinone ligands are coordinated trans to the oxo ligands and the deprotonated hydroxyl O atoms are located trans to each other. The crystal structure contains inter-molecular N-H⋯O hydrogen bonds, C-H⋯O contacts and face-to-face π-π stacking inter-actions with an inter-planar separation of 3.

Luminescent piano-stool complexes incorporating 1-(4-cyanophenyl)imidazole: synthesis, spectral, and structural studies.

Three novel luminescent piano-stool arene ruthenium complexes of general formula [(eta(6)-arene)RuCl(2)(CPI)] (eta(6)-arene = benzene, 1, p-cymene, 2, and hexamethylbenzene, 3; CPI=1-(4-cyanophenyl)imidazole were prepared. The molecular structures of 2 and 3 were determined crystallographically. Reaction of 1-3 with EPh(3) (E = P, As, or Sb) and N-N donor bases such as 2,2'-bipyridine and 1,10-phenanthroline afforded cationic mononuclear complexes of general formula [(eta(6)-arene)RuCl(CPI)(EPh(3))](+) (eta(6)-arene = C(6)H(6), E = P (1a), E = As (1b), E = Sb(1c); eta(6)-arene = C(10)H(14), E = P (2a), E = As (2b), E = Sb (2c); eta(6)-arene = C(6)Me(6), E = P (3a), E = As (3b), E = Sb (3c)) and [(eta(6)-arene)Ru(N-N)(CPI)](2+) (eta(6)-arene = C(6)H(6), N-N = bipy (1d), N-N = phen (1e); eta(6)-arene = C(10)H(14), N-N = bipy (2d), N-N = phen (2e); eta(6)-arene = C(6)Me(6), N-N = bipy (3d), N-N = phen (3e)).