Mercury Monohalides as Ligands in Transition Metal Complexes.

The main categories of transition metal-mercury heterometallic compounds are briefly summarized. The attention is focused on complexes and clusters where the {Hg-Y} fragment, where Y represents a halide atom, interacts with transition metals. Most of the structurally characterized derivatives are organometallic compounds where the transition metals belong to the Groups 6, 8, 9 and 10.

Dentin hypersensitivity and quality of life in patients with chronic systemic disease.

Objectives: To assess the potential impact of dentin hypersensitivity on the quality of life in people with chronic systemic diseases.

Methods: We included 252 volunteers, 18 years or older, with ≥ 6 teeth, and under outpatient medical follow-up for systemic chronic diseases. Short Form Health Survey 36 (SF-36) was used to assess quality of life (QoL); Oral Health Impact Profile-14 (OHIP-14) and Dentine Hypersensitivity Experience Questionnaire (DHEQ-15) were used for oral health-related quality of life (OHRQoL).

Comparative clinical evaluation of the stability of implants using double acid etching treatment with and without the addition of fluoride solution: A randomized clinical trial.

Background: Osseointegration depends on primary stability, and further, implant surface modifications may improve secondary stability. This randomized clinical trial evaluates whether adding a fluoride solution enhances the implant stability.

Materials And Methods: Stability of dental implants with two different types of surface treatments was compared utilizing resonance frequency analysis (RFA).

Atomically precise rhodium-indium carbonyl nanoclusters: synthesis, characterization, crystal structure and electron-sponge features.

In this paper we present the investigation of the reactivity of [Rh(CO)] with InCl, with the aim of expanding the more general study that allowed us to obtain, among other species, the icosahedral [RhE(CO)] ( = 4 when E = Ge or Sn; = 3 when E = Sb or Bi) family of clusters. Indeed, the study resulted in the isolation and characterization of the analogous In-centred icosahedral [RhIn(CO)] nanocluster (1), which is isoelectronic and isostructural with the [RhE(CO)] congeners. During the course of the reaction two more new species, namely the octahedral [Rh(CO)InCl] (2) and the dimeric [{Rh(CO)InCl}] (3) have also been identified.

Exploring the relationship between anxiety, patient characteristics and pain outcomes in oral surgery under local anesthesia: The measurement problem.

Background: Anxiety during oral surgery can impact patient homeostasis, increase the difficulty of the procedure and create additional stress for the surgeon. Furthermore, it has been associated with more intense and prolonged pain during and after dental treatment.

Objectives: The aim of the study is to evaluate the relationship between anxiety, patient characteristics and pain outcomes in oral surgery, as well as to verify the impact of anxiety on patient's perception of pain during and after oral surgery.

Peraurated ruthenium hydride carbonyl clusters: aurophilicity, isolobal analogy, structural isomerism, and fluxionality.

The stepwise addition of increasing amounts of Au(PPh)Cl to [HRu(CO)] (1) results in the sequential formation of [HRu(CO)(AuPPh)] (2), [HRu(CO)(AuPPh)] (3), and HRu(CO)(AuPPh) (4). Alternatively, 4 can be obtained upon addition of HBF·EtO (two mole equivalents) to 3. Further addition of acid to 3 (three mole equivalents) results in the formation of the tetra-aurated cluster Ru(CO)(AuPPh) (5).

Prevalence and factors associated with dry socket following routine dental extractions.

Background: Dry socket (DS) or fibrinolytic osteitis is a relatively common complication that can occur following tooth extraction. This study aimed to determine the prevalence of DS and identify its associated predictive and mediating variables.

Material And Methods: This study is classified as prospective observational, cross-sectional, and multicenter.

Luminescent Behavior of Zn(II) and Mn(II) Halide Derivatives of 4-Phenyldinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-Oxide and Single-Crystal X-ray Structure Determination of the Ligand.

The two enantiomers of chiral phosphonate 4-phenyldinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine 4-oxide, O=PPh(BINOL), were synthesized from the proper 1,1'-bi-2-naphtol (BINOL) enantiomer and characterized. The structure of the ()-enantiomer was elucidated by means of single-crystal X-ray diffraction. The reaction with anhydrous ZnBr afforded complexes having the general formula [ZnBr{O=PPh(BINOL)}] that showed intense fluorescence centered in the near-UV region rationalized on the basis of TD-DFT calculations.

Triiron Complex with -Ferrocenyl Aminocarbyne Ligand Bridging a Diiron Core: DFT, Electrochemical, and Biological Insights.

The first -ferrocenyl aminocarbyne complex, [FeCp(CO)(μ-CO){μ-CN(Me)(Fc)}]CFSO (), was synthesized with an 88% yield from [FeCp(CO)], isocyanoferrocene (CNFc), and methyl triflate. The synthesis proceeded through the intermediate formation of [FeCp(CO)(CNFc)], . Multinuclear NMR experiments revealed the presence of cis and trans isomers for in organic solvents, in agreement with DFT outcomes.

Detection of atmospheric aerosols and terrestrial nanoparticles collected in a populous city in southern Brazil.

The main objective of this study is to analyze hazardous elements in nanoparticles (NPs) (smaller than 100 nm) and ultrafine particles (smaller than 1 µm) in Porto Alegre City, southern Brazil using a self-made passive sampler and Sentinel-3B SYN satellite images in 32 collection points. The Aerosol Optical Thickness proportion (T550) identification was conducted using images of the Sentinel-3B SYN satellite at 634 points sampled in 2019, 2020, 2021, and 2022. Focused ion beam scanning electron microscopy analyses were performed to identify chemical elements present in NPs and ultrafine particles, followed by single-stage cascade impactor to be processed by high-resolution transmission electron microscopy.

N-Indolyl diiron vinyliminium complexes exhibit antiproliferative effects in cancer cells associated with disruption of mitochondrial homeostasis, ROS scavenging, and antioxidant activity.

The indole scaffold has been established as a key organic moiety for developing new drugs; on the other hand, a range of diiron bis-cyclopentadienyl complexes have recently emerged for their promising anticancer potential. Here, we report the synthesis of novel diiron complexes with an indole-functionalized vinyliminium ligand (2-5) and an indole-lacking analogue for comparative purposes (6), which were characterized by analytical and spectroscopic techniques. Complexes 2-6 are substantially stable in DMSO‑d and DMEM-d solutions at 37 °C (8% average degradation after 48 h) and display a balanced hydrophilic/lipophilic behaviour (LogP values in the range -0.

Highly Reduced Ruthenium Carbide Carbonyl Clusters: Synthesis, Molecular Structure, Reactivity, Electrochemistry, and Computational Investigation of [RuC(CO)].

The reaction of [RuC(CO)] () with NaOH in DMSO resulted in the formation of a highly reduced [RuC(CO)] (), which was readily protonated by acids, such as HBF·EtO, to [HRuC(CO)] (). Oxidation of with [CpFe][PF] or [CH][BF] in CHCN resulted in [RuC(CO)(CHCN)] (), which was quantitatively converted into after exposure to CO atmosphere. The reaction of with a mild methylating agent such as CHI afforded the purported [RuC(CO)(COCH)] ().

COVID-19 hospitalized patients and oral changes: a case-control study.

Objectives: To investigate the association between hospitalization for COVID-19 and oral changes, and to evaluate whether oral changes can indicate a higher risk of disease progression to death.

Materials And Methods: This case-control study analyzed patients hospitalized (university hospital), including those in intensive care unit and clinical wards. The study group comprised 69 COVID-19 positive patients (PCR-test), while the control group included 43 COVID-19 negative patients.

Triazine Chalcogenones from Thiocyanate or Selenocyanate Addition to Tetrazine Ligands in Ruthenium Arene Complexes.

The chemistry of 1,2,4,5-tetrazines has attracted considerable interest both from a synthetic and applicative standpoint. Recently, regioselective reactions with alkynes and alkenes have been reported to be favored once the tetrazine ring is coordinated to Re(I), Ru(II), and Ir(III) centers. Aiming to further explore the effects of metal coordination, herein, we unveil the unexplored reactivity of tetrazines with chalcogenocyanate anions.

Diiron Aminocarbyne Complexes with NCE Ligands (E = O, S, Se).

Diiron μ-aminocarbyne complexes [FeCp(NCMe)(CO)(μ-CO){μ-CN(Me)(R)}]CFSO (R = Xyl, ; R = Me, ; R = Cy, ; R = CHPh, ), freshly prepared from tricarbonyl precursors , reacted with NaOCN (in acetone) and NBuSCN (in dichloromethane) to give [FeCp(k-NCO)(CO)(μ-CO){μ-CN(Me)(R)}] (R = Xyl, ; Me, ; Cy, ) and [FeCp(k-NCS)(CO)(μ-CO){μ-CN(Me)(CHPh)}], in 67-81% yields via substitution of the acetonitrile ligand. The reaction of with KSeCN in THF at reflux temperature led to the cyanide complexes [FeCp(CN)(CO)(μ-CO){μ-CNMe(R)}], - (45-67%). When the reaction of with KSeCN was performed in acetone at room temperature, subsequent careful chromatography allowed the separation of moderate amounts of [FeCp(k-SeCN)(CO)(μ-CO){μ-CN(Me)(Xyl)}], , and [FeCp(k-NCSe)(CO)(μ-CO){μ-CN(Me)(Xyl)}], .

From M to M, M and M molecular alloy Pt-Ni carbonyl nanoclusters: selective growth of atomically precise heterometallic nanoclusters.

Heterometallic Chini-type clusters [PtNi(CO)] ( = 0-6) were obtained by reactions of [Pt(CO)] with Ni-clusters such as [Ni(CO)], [Ni(CO)] and [HNi(CO)], or from [Pt(CO)] and [Ni(CO)]. The Pt/Ni composition of [PtNi(CO)] ( = 0-6) depended on the nature of the reagents employed and their stoichiometry. Reactions of [Pt(CO)] with [Ni(CO)] and [HNi(CO)], as well as reactions of [Pt(CO)] with [Ni(CO)], [Ni(CO)] and [HNi(CO)], afforded [PtNi(CO)] ( = 0-9) species.

Alkyne-alkenyl coupling at a diruthenium complex.

Dimetallic complexes are suitable platforms for the assembly of small molecular units, and the reactivity of bridging alkenyl ligands has been widely investigated to model C-C bond forming processes. Here, we report the unusual coupling of an alkenyl ligand, bridging coordinated on a diruthenium scaffold, with a series of alkynes, revealing two possible outcomes. The diruthenium complex [RuCp(Cl)(CO)(μ-CO){μ-η:η-C(Ph)CH(Ph)}], 2, was prepared in two steps from [RuCp(CO)(μ-CO){μ-η:η-C(Ph)CH(Ph)}]BF, [1]BF4, in 69% yield.

2-D Molecular Alloy Ru-M (M = Cu, Ag, and Au) Carbonyl Clusters: Synthesis, Molecular Structure, Catalysis, and Computational Studies.

The reactions of [HRu(CO)] () with M(I) (M = Cu, Ag, and Au) compounds such as [Cu(CHCN)][BF], AgNO, and Au(EtS)Cl afford the 2-D molecular alloy clusters [CuRu(CO)] (), [AgRu(CO)] (), and [AuRu(CO)] (), respectively. The reactions of with PPh result in mixtures of products, among which [CuRu(CO)] (), Ru(CO)(CuPPh) (), Ru(CO)(AgPPh) (), Ru(CO)(PPh) (), and HRu(OH)(CO)(PPh) () have been isolated and characterized. The molecular structures of and have been determined by single-crystal X-ray diffraction.

Atomically Precise Platinum Carbonyl Nanoclusters: Synthesis, Total Structure, and Electrochemical Investigation of [Pt(CO)] Displaying a Defective Structure.

The molecular Pt nanocluster [Pt(CO)] () was obtained by thermal decomposition of [Pt(CO)] in tetrahydrofuran under a H atmosphere. The reaction of with increasing amounts of HBFEtO afforded the previously reported [Pt(CO)] () and [Pt(CO)] (). The new nanocluster was characterized by IR and UV-visible spectroscopy, single-crystal X-ray diffraction, direct-current superconducting quantum interference device magnetometry, cyclic voltammetry, IR spectroelectrochemistry (IR SEC), and electrochemical impedance spectroscopy.

η-Coordinated ruthenabenzenes from three-component assembly on a diruthenium μ-allenyl scaffold.

The room temperature reactions with internal alkynes, RCCR, of the μ-allenyl acetonitrile complex [RuCp(CO)(NCMe){μ-η:η-CHCCMe}]BF (1-NCMe), freshly prepared from the tricarbonyl precursor [RuCp(CO){μ-η:η-CHCCMe}]BF, 1, proceeded with alkyne insertion into ruthenium-allenyl bond and allenyl-CO coupling, affording compounds [RuCp(CO){μ-η:η-C(R)C(R)CHC(CMeCH)C(OH)}]BF (R = Ph, 2; R = COMe, 3; R = COEt, 4) in 83-94% yields. Deprotonation of 2-4 by triethylamine gave [RuCp(CO){μ-η:η-C(R)C(R)CHC(CMeCH)C(O)}] (R = Ph, 5; R = COMe, 6; R = COEt, 7) in 75-88% yields, and 2-4 could be recovered upon HBF·EtO addition to 5-7. All the products, 2-7, were fully characterized by elemental analysis, IR and multinuclear NMR spectroscopy.

Synthesis, molecular structure and fluxional behavior of the elusive [HRu(CO)] carbonyl anion.

The elusive mono-hydride tri-anion [HRu(CO)] (4) has been isolated and fully characterized for the first time. Cluster 4 can be obtained by the deprotonation of [HRu(CO)] (2) with NaOH in DMSO. A more convenient synthesis is represented by the reaction of [HRu(CO)] (6) with an excess of NaOH in DMSO.

Cyanide-alkene competition in a diiron complex and isolation of a multisite (cyano)alkylidene-alkene species.

The μ-(amino)alkylidyne complex [FeCp(CO)(μ-CO){μ-CNMe(CHCHCH)}]CFSO, [1]CFSO, reacted with NBuCN in dichloromethane affording the μ-(cyano)(amino)alkylidene [FeCp(CO)(μ-CO){μ-C(CN)N(Me)(CHCHCH)}], 2, in 91% yield. Decarbonylation of 2 by using MeNO in acetone at room temperature yielded [FeCp(CO)(μ-CO){μ-κ-C(CN)N(Me)(CHCHCH)}], 3, containing a multidentate alkylidene-alkene ligand occupying both a bridging site and a terminal site, in admixture with the μ-(amino)alkylidyne cyanide product [FeCp(CN)(CO)(μ-CO){μ-CN(Me)(CHCHCH)}], 4. The reaction of the μ-(amino)alkylidyne imine complex [FeCp(CO)(μ-CO)(NHCPh){μ-CN(Me)(CHCHCH)}]CFSO, [7]CFSO, with NBuCN gave 3 with an optimized yield of 75% imine elimination.

Screening the biological properties of transition metal carbamates reveals gold(I) and silver(I) complexes as potent cytotoxic and antimicrobial agents.

We report a screening study aimed to assess for the first time the air- and water-stability and the biological potential of simple metal-carbamates. These molecular metallic species are based on elements belonging to the groups 4-5, 7-9 and 11, and tin, and are easily available from inexpensive reagents. Complexes [Ag(OCNEt)] (13-Ag) and [Au(OCNMe)(PPh)] (14-Au) resulted substantially stable in aqueous media and exhibited a potent in vitro cytotoxicity.

Nonsteroidal Anti-inflammatory Drugs Alone or in Combination With Acetaminophen are Effective and Safe Treatments for Short-Term Pain Control in Nonsurgical Endodontic Treatment.

Article Title And Bibliographic Information: Zanjir M, Sgro A, Lighvan NL, Yarascavitch C, Shah PS, da Costa BR, Azarpazhooh A. Efficacy and Safety of Postoperative Medications in Reducing Pain after Nonsurgical Endodontic Treatment: A Systematic Review and Network Meta-analysis. J Endod.

Photoluminescence of Homoleptic Lanthanide Complexes With Tris(benzotriazol-1-yl)borate.

Bright photoluminescent neutral complexes having general formula [Ln(tbtz)] (Ln = Eu, Tb; tbtz = tris(benzotriazol-1-yl)borate) were obtained by reacting K[tbtz] with EuCl and TbCl. The emissions in the visible range, related to the f-f transitions of the trivalent lanthanide ions, are observable upon excitation with wavelengths shorter than 350 nm. The most intense emission bands correspond to the D → F transition at 699 nm for the europium complex and to the D → F transition at 542 nm for the terbium derivative.