Abstract In spite of the fact that cadmium(II) has been recognized as a highly toxic element and excessive exposure to this metal ion reported have many adverse effects on human health, very few selective specific fluorescent probes are available for imaging Cd 2+ in living cells. Herein, we report spectroscopic photochemical characterization 5‐(5‐chloro‐8‐hydroxyquinolinylmethyl)‐2,8‐dithia‐5‐aza‐2,6‐pyridinophane ( L ) sensor particular, response was first assessed aqueous solutions,...

Four new fluorescent chemosensors for metal ions based on 8-hydroxyquinoline (8-HDQ) derivatives and sulfur-containing macrocyclic units were synthesized characterized, namely 1-(5-chloro-8-hydroxy-7-quinolinylmethyl)-1-aza-4,7,10-trithiacyclododecane (L1), 1-(5-chloro-8-hydroxy-7-quinolinylmethyl)-1-aza-4,13-dithia-7,10-dioxacyclopentadecane (L2), 1-(8-hydroxy-2-quinolinylmethyl)-1-aza-4,7,10-trithiacyclododecane (L3),...

The hydroauration of internal and terminal alkynes by gold(III) hydride complexes [(C^N^C)AuH] was found to be mediated radicals proceeds an unexpected binuclear outer-sphere mechanism cleanly form trans-insertion products. Radical precursors such as azobisisobutyronitrile lead a drastic rate enhancement. DFT calculations support the proposed radical mechanism, with very low activation barriers, rule out mononuclear mechanistic alternatives. These alkyne hydroaurations are highly regio-...

Optical waveguides are essential components in integrated photonic circuits and communication devices. Despite recent advances both inorganic organic materials, the use of Coordination Polymers (CPs) as single-crystal optical remains its infancy but shows great potential. This study aims to gain insight into several design factors for preparation single crystal CPs be used active waveguides. These include nature ligand-based emission (investigated experimentally theoretically), chemical...

Proceeding from a ligand constituted by two units of kojic acid linked methylene group, which proved very promising chelator for excess iron(III) and aluminium(III) pathologies, new ligands have been designed synthesized: one adding vanillin molecule in the linker second an o-vanillin molecule. Both these ligands, on basis complex formation studies presented here, show significant potential as therapeutic agents iron aluminium overload. Protonation constants pure determined potentiometry,...

A series of new complexes general formula [AuIII(N^N)Br2](PF6) (N^N = 2,2'-bipyridine and 1,10-phenanthroline derivatives) were prepared characterized by spectroscopic, electrochemical, diffractometric techniques tested against Gram-positive Gram-negative bacterial strains (Staphylococcus aureus, Streptococcus intermedius, Pseudomonas aeruginosa, Escherichia coli), showing promising antibacterial antibiofilm properties.

Abstract The reactivity of the imidazoline‐2‐selone derivatives 1,1′‐methylenebis(3‐methyl‐4‐imidazoline‐2‐selone) ( D1 ) and 1,2‐ethylenebis(3‐methyl‐4‐imidazoline‐2‐selone) D2 towards interhalogens IBr ICl has been investigated in solid state with aim synthesising “T‐shaped” hypervalent chalcogen compounds featuring extremely rare linear asymmetric IEX moieties (E=S, Se; X=Br, Cl). X‐ray diffraction analysis FT‐Raman measurements provided a clear indication presence obtained discrete...

an tautomeric changes positively influence coordinating ability?

6-Methoxy-3-(pyridin-2-yl)-2<italic>H</italic>-chromen-2-one exhibited fluorescence enhancement in the presence of Fe(<sc>iii</sc>). This molecule was a selective fluorescent chemosensor for

The experimental structural features of chalcogen bonding (ChB) interactions in over 34,000 linear fragments R-Ch⋯A (Ch = S, Se, Te; R C, N, O, A Te, F, Cl, Br, I) were analyzed. bond distances dR-Ch and the interaction dCh⋯A investigated, functions δR-Ch δCh⋯A introduced to compare data involving different Ch atoms. calculated by normalizing differences between relevant ChB with respect sum covalent (rcovR + rcovCh) van der Waals (vdW) radii (rvdWCh rvdWA), respectively. systematic...

The I(2)-adducts of drugs propylthiouracil (PTU) and methimazole (MeImSH) oxidize liquid mercury in dichloromethane to separate good yield the neutral complexes [HgI(2)(PTU)(2)·MeOH] (1), [HgI(2)(PTU)(2)·HgI(2)] (2), [Hg(2)I(4)(MeImSH)(2)] (3). single crystal X-ray diffraction analysis 1-2 shows that Hg(II) center is coordinated by two sulfur atoms iodine a tetrahedral geometry. In complex 2 almost linear molecules HgI(2) result encapsulated packing enfolded hydrophobic propyl appendages...

The reaction of (C∧Npz∧C)AuCl with C–H acidic compounds H2CR1R2 in the presence base readily affords corresponding alkyl complexes (C∧Npz∧C)AuCHR1R2 (2a, R1 = R2 CN; 3a, C(O)Me; 4, CO2Et; 5, C(O)Ph; 6a, H, C(O)Me). analogous pyridine-pincer 2b, 3b, and 6b were obtained similarly (C∧Npz∧C 2,6-bis(4′-tBuC6H3)2pyrazine dianion; C∧Npy∧C 2,6-bis(4′-tBuC6H3)2pyridine dianion). reactions (C∧Npz∧C)AuOAcF (7a) (C∧Npy∧C)AuOAcF (7b) MeMgI gave methyl (C∧Npz∧C)AuMe (8a) (C∧Npy∧C)AuMe (8b), respectively....

The reaction of the bis(1,2-dithiolene) complex [Pd(Me2timdt)2] (1; Me2timdt•– = monoreduced 1,3-dimethyl-2,4,5-trithioxoimidazolidine) with Br2 yielded [Pd(Me2timdt)Br2] (2), which was reacted Na2mnt (mnt2– 1,2-dicyano-1,2-ethylenedithiolate) to give neutral mixed-ligand [Pd(Me2timdt)(mnt)] (3). Complex 3 shows an intense solvatochromic near-infrared (NIR) absorption band falling between 955 nm in DMF and 1060 CHCl3 (ε 10700 M–1 cm–1 CHCl3). DFT calculations were used elucidate electronic...

Abstract The electrochemical, UV/Vis–NIR absorption, and emission‐spectroscopic features of (TBA + )( 1 − ) the corresponding neutral complex were investigated =tetrabutylammonium; =[Au III (Pyr,H‐edt) 2 ] ; Pyr,H‐edt 2− =pyren‐1‐yl‐ethylene‐1,2‐dithiolato). intense electrochromic NIR absorption ( λ max =1432 nm; ε =13000 M −1 cm in CH Cl potential‐controlled visible emission range 400–500 nm, energy which depends on charge complex, interpreted grounds time‐dependent DFT calculations carried...

Abstract Eighteen new [Pt II (N∧N)(S∧S)] complexes [ 23 – 40 ; N∧N = diimine: 2,2′‐bipyridine, 1,10‐phenanthroline and alkyl/aryl‐substituted derivatives; S∧S arylethylene‐1,2‐dithiolate (R‐edt 2– : R phenyl, 2‐naphthyl, 1‐pyrenyl), N ‐substituted 2‐thioxothiazoline‐4,5‐dithiolate (R‐dmet methyl, ethyl, phenyl)] have been synthesized characterized by spectroscopic (UV/Vis/NIR, fluorescence) electrochemical (CV) measurements. Single‐crystal X‐ray diffraction analysis allowed structural...

Gold(I) and gold(III) complexes derived from 2-(2′-pyridyl)benzimidazole (pbiH) were proven to be a promising class of in vitro antitumor agents against A2780 human ovarian cancer cells. In this paper, comparative electrochemical, UV–vis absorption, emission spectroscopic investigation is reported on pbiH, the two mononuclear AuIII [(pbi)AuX2] (X = Cl (1), AcO (2)), four AuI derivatives [(pbiH)AuCl] (3), [(pbiH)Au(PPh3)]PF6 ((4+)(PF6–)), [(pbi)Au(PPh3)] (5), [(pbi)Au(TPA)] (6), three...

Two ditopic PPD based ligands are able to discriminate Cd^IIover Zn^IIin aqueous solution on the difference in their ionic radii, acting as OFF–ON fluorescent probes.

The solid-state emission properties of bifluorene–tetracarboxylic acid were reported and rationalised on the basis fluorene torsional dynamics by SC-XRD DFT calculations.

Reactions between methyldiphenylphosphane selenide, SePPh(2)Me, and different group 11 metal starting materials {CuCl, [CuNO(3)(PPh(3))(2)], AgOTf, [AgOTf(PPh(3))] (OTf = OSO(2)CF(3)), [AuCl(tht)], [Au(C(6)F(5))(tht)] [Au(C(6)F(5))(3)(tht)] (tht tetrahydrothiophene)} were performed in order to obtain several new species with metal-selenium bonds. The complexes [CuCl(SePPh(2)Me)] (1), [AgOTf(SePPh(2)Me)] (2), [AuCl(SePPh(2)Me)] (5), [Au(C(6)F(5))(SePPh(2)Me)] (6) [Au(C(6)F(5))(3)(SePPh(2)Me)]...

Abstract The hydroauration of internal and terminal alkynes by gold(III) hydride complexes [(C^N^C)AuH] was found to be mediated radicals proceeds an unexpected binuclear outer‐sphere mechanism cleanly form trans ‐insertion products. Radical precursors such as azobisisobutyronitrile lead a drastic rate enhancement. DFT calculations support the proposed radical mechanism, with very low activation barriers, rule out mononuclear mechanistic alternatives. These alkyne hydroaurations are highly...

The H -shaped [I 10 Cl 4 ] 4− polyhalide is the result of interplay directional HBs, XBs and π–π interactions driven by structural features 2-( p -tolyl)selenopheno[2,3- b ]pyridinium cation template.

The reactivity between bis(pyridin-2-yl)diselane o Py2 Se2 and ditellane Te2 (L1 L2, respectively; Py=pyridyn-2-yl) I2 /Br2 is discussed. Single-crystal structure analysis revealed that the reaction of L1 with yielded [(HL1+ )(I- )⋅5/2I2 ]∞ (1) in which monoprotonated cations HL1+ template a self-assembled infinite pseudo-cubic polyiodide 3D-network, while Br2 dibromide Ho PySeII (2). oxidation L2 compounds PyTeII (3) PyTeIV Br4 (6), respectively, whose structures were elucidated by X-ray...

The tetrabutylammonium (TBA(+)) salts of square-planar monoanionic gold complexes the unsymmetrically substituted Ar,H-edt(2-) 1,2-dithiolene ligands (Ar,H-edt(2-)=arylethylene-1,2-dithiolato; Ar=phenyl (1(-)), 2-naphthyl (2(-)), and 1-pyrenyl (3(-))) were synthesized characterized by spectroscopic electrochemical methods corresponding neutral species (1, 2, 3, respectively) obtained in CH(2)Cl(2) solution at room temperature diiodine oxidation. single-crystal X-ray diffraction structural...

The possibility of constructing extended networks based on NH+⋯N charge-assisted hydrogen bonding and N⋯I interactions was explored. organic modules 3,5-di-(3-pyridyl)-1,2,4-thiadiazole (L1) 3,5-di-(4-pyridyl)-1,2,4-thiadiazole (L2) possess two pyridyl groups, allowing them to act both as hydrogen-bond acceptors donors with H+ acting the main linker between molecular units. crystal structure ionic compounds (HL1)I3, (HL1)I5, (HL1)IBr2, (HL2)I3, (HL2)IBr2 are described; position nitrogen...