This paper presents some copper(II) complexes of salen analogues in which the two salicylaldehyde moieties carry different (electron donor, D, and acceptor, A) substituents position 5, producing a push−pull charge asymmetry. The X-ray structures compounds show presence pairs stacked molecules with head-to-tail intermolecular associations. geometries all have been optimized through density functional theory (DFT) studies, shown that major influence on coordination bond lengths is given by...

Abstract The homoleptic mononuclear compound [Co(bpp‐COOMe) 2 ](ClO 4 ) ( 1 (bpp‐COOMe=methyl 2,6‐di(pyrazol‐1‐yl)pyridine‐4‐carboxylate) crystallizes in the monoclinic C 2/ c space group, and cobalt(II) ion possesses a pseudo‐octahedral environment given by two mer ‐coordinated tridentate ligands. Direct‐current magnetic data, single‐crystal torque magnetometry, EPR measurements disclosed easy‐axis nature of this complex, which shows single‐molecule magnet behavior when static field is...

The syntheses of trans-[Ru{4,4'-C[triple bond]CC(6)H(2)[2,5-(OEt)(2)]C[triple bond]CC(6)H(4)NO(2)}Cl(dppm)(2)] (19), trans-[Ru{4,4',4''-C[triple bond]CC(6)H(4)C[triple (20), trans-[Ru{4,4',4'',4'''-C[triple bond]CC(6)H(4)NO(2)}Cl(dppe)(2)] (21), (22), (23), and trans-[Ru{4,4',4'',4''',4''''-C[triple (24) are reported, together with those precursor alkynes, complexes the donor-pi-bridge-acceptor formulation that affords efficient quadratic cubic NLO compounds; identity 19 was confirmed by a...

Abstract Background Human dental pulp stem cells represent a mesenchymal cell niche localized in the perivascular area of and are characterized by low immunogenicity immunomodulatory/anti-inflammatory properties. Pericytes, mural surrounding endothelium small vessels, regulate numerous functions including vessel growth, stabilization permeability. It is well established that pericytes have tight cross talk with endothelial neoangiogenesis stabilization, which regulated different factors,...

The copper(II) complexes of general formula [Cu(GL2H,H)(Cl)] (A4–A6, G = NO2, H and OMe, respectively), bearing NNO tridentate Schiff base ligands (GL2H,H)− derived from the mono-condensation 1,3-diaminopropane G-substituted salicylaldehydes, are here reported. elongation diamine with one additional carbon atom respect to triad ethylenediamine [Cu(GL1H,H)(Cl)] (A1–A3, respectively) led different synthetic procedures, difficult isolation A6 that could be obtained only in few crystals suitable...

Abstract Tetrairon(III) single‐molecule magnets [Fe 4 (pPy) 2 (dpm) 6 ] ( 1 ) (H 3 pPy=2‐(hydroxymethyl)‐2‐(pyridin‐4‐yl)propane‐1,3‐diol, Hdpm=dipivaloylmethane) have been deliberately organized into supramolecular chains by reaction with Ru II or III paddlewheel complexes. The products ][Ru (OAc) ](BF x =0 a =1 b differ in the electron count on paramagnetic diruthenium bridges and display hysteresis loops of substantially different shape. Owing to their large easy‐plane anisotropy, s...

The relevance of cis and trans influences some anionic ligands X Y in cis-[PtX2(PPh3)2] cis-[PtXY(PPh3)2] complexes have been studied by the X-ray crystal structures several derivatives (X2 = (AcO)2 (3), (NO3)2 (5), Br2 (7), I2 (11); XY Cl(AcO) (2), Cl(NO3) (4), Cl(NO2) (13)), density functional theory (DFT) calculations, one bond Pt−P coupling constants, 1JPtP. latter allowed an evaluation relative magnitude both influences. It is concluded that such act a cooperative way influence not...

Compound [Cr5(tpda)4Cl2] (H2tpda = N(2),N(6)-di(pyridin-2-yl)pyridine-2,6-diamine), an Extended Metal Atom Chain complex featuring two quadruply-bonded {Cr2} units, exhibits field-induced slow relaxation of its magnetization arising from the terminal chromium(II) ion and provides first example a chromium(II)-based Single-Molecule Magnet.

Beneficial effects in bone cell growth and antibacterial action are currently attributed to Ga3+ ions. Thus, they can be used upgrade mesoporous bioactive glasses (MBGs), investigated for tissue engineering, whenever released therapeutic amounts of gallium ions the surrounding medium. Three gallium-enriched MBGs with composition (in mol %) xSiO2–yCaO–zP2O5–5Ga2O3, being x = 70, y 15, z 10 Ga_1; 80, 12, 3 Ga_2; 0 Ga_3, were compared gallium-free 80SiO2–15CaO–5P2O5 MBG (B). 29Si 31P MAS NMR...

The cytocompatibility of potential bioactive cerium-containing (Ce3+/Ce4+) glasses is here investigated by preparing three different with increasing amount doping CeO2 (1.2, 3.6 and 5.3 mol% CeO2, called BG_1.2, BG_3.6 BG_5.3, respectively) based on 45S5 Bioglass® (called BG). These materials were characterized Environmental Scanning Electron Microscopy (ESEM) infrared spectroscopy (FTIR) after performing bioactivity tests in Dulbecco’s Modified Eagle Medium (DMEM) solution, the ions...

The cis influence of a series anionic ligands X and Y has been evaluated through the magnitude Pt-P coupling constants for compounds formula trans-[PtXY(PPh(3))(2)]. order decreasing was found to be I > Cl SePh approximately SPh SEt NO(3) AcO NO(2) H Me Ph mtc (mtc = N,N-dimethylmonothiocarbamato-S); moreover, influences various additive. X-ray structures three representative (t-: Cl, NO(3); t-: NO(2)) have also determined.

High or low spin states in iron(<sc>ii</sc>) complexes with functionalised 2,6-bis(pyrazol-1-yl)pyridine ligands are efficaciously driven by intermolecular contacts.

The reaction of organic molecules mediated by a metal center (template synthesis) can result in final connectivity that may differ from the one obtained absence metal. condensation carbonyl fragments with primary amines form C=N iminic bonds, so-called Schiff bases, which act as ligands for templating means lone pair on nitrogen atom. This review focuses template methods between compound (mainly salicylaldehyde) and aliphatic diamine able to prevent double both amine groups obtain tridentate...

Abstract We describe some copper(II) complexes with tridentate anionic Schiff bases, L – , derived from the monocondensation of 5‐substituted salicylaldehydes (5‐G‐salH, G = H, NO 2 and OMe) ethylenediamine (en) or 1,3‐diaminopropane (tn). Mononuclear [CuL(py)] + dinuclear [Cu ] 2+ trinuclear 3 (μ ‐OH)] compounds have been obtained, factors affecting nuclearity were investigated found to depend on reaction conditions, nature length diamine. The crystal structures seven representative...

The syntheses of trans-[Ru(4,4′-C≡CC6H4C≡CC6H4NO2)Cl(dppe)2] (19) and the systematically varied complexes trans-[Ru(4,4′,4′′-C≡CC6H4X2C6H4Y2C6H4NO2)Cl(L2)2] [L2 = dppe, X2 C≡C, Y2 (E)-CH=CH (12), C≡C (18); L2 (E)-CH=CH, (14), (16); dppm, (13); (15), (17)] are reported, latter being donor-bridge-acceptor varying in bridge composition by replacement yne with E-ene linkages, together their cyclic voltammetric data, linear optical, quadratic nonlinear optical response data. RuII/III oxidation...

A new tetrairon(III) single-molecule magnet with enhanced volatility and processability was obtained by partial fluorination of the ancillary β-diketonato ligands. Fluorinated proligand Hpta = pivaloyltrifluoroacetone used to assemble bis(alkoxido)-bridged dimer [Fe2(OEt)2(pta)4] (1) in crystalline form, from which tetranuclear complex [Fe4(L)2(pta)6] (2) synthesized a one-pot reaction H3L 2-hydroxymethyl-2-phenylpropane-1,3-diol, NaOEt, FeCl3 Et2O:EtOH solvent mixture. The structure...

The valence electronic structures of two single-molecule magnets (SMMs), [Fe4(L)2(dpm)6] and [Fe4(L)2(pta)6], (Hdpm = dipivaloylmethane, Hpta pivaloyltrifluoroacetone, L3− Ph–C(CH2O)33−), are investigated by means ultraviolet photoemission spectroscopy (UPS) ab initio calculations. experimental UPS spectra both compounds analysed compared with the total density states (TDOS) computed hybrid functional PBE0. substitution half methyl groups in fluorine atoms [Fe4(L)2(pta)6] unexpectedly...

Single-crystal torque magnetometry performed on weakly-coupled polynuclear systems provides access to a complete description of single-site anisotropy tensors. Variable-temperature, variable-field was used investigate triiron(III) complex [Fe3La(tea)2(dpm)6] (Fe3La), lanthanum(III)-centred variant tetrairon(III) single molecule magnets (Fe4) (H3tea = triethanolamine, Hdpm dipivaloylmethane). Due the presence diamagnetic lanthanoid, magnetic interactions among iron(III) ions (si 5/2) are very...

Salen-type metal complexes have been actively studied for their nonlinear optical (NLO) properties, and push-pull compounds with charge asymmetry generated by electron releasing withdrawing groups shown promising results. As a continuation of our research in this field aiming at solid-state features, herein we report on the synthesis mononuclear copper(II) derivatives bearing either tridentate N2O Schiff bases L(a-c)- pyridine as forth ancillary ligand, [Cu(La-c)(py)](ClO4) (1a-c), or...

New push-pull (A-D) nickel(ii) compounds of general formula [Ni(5-A-5'-D-saltn)] (3a-3l) with unsymmetrically-substituted N2O2 tetradentate Schiff base ligands are reported here. The 5-A-5'-D-saltn2- (H2saltn = N,N'-bis(salicylidene)diaminopropane) possess differently-substituted salicylaldehyde (A/Dsal) moieties condensed to 1,3-diaminopropane (tn), and carry either an electron acceptor (A H, Br, or NO2) donor (D Me, OMe) group in the para position respect coordinated phenoxido oxygen...

The electron withdrawing nitro group enhances the <italic>in vitro</italic> cytotoxicity of copper(<sc>ii</sc>) complexes bearing tridentate NNO Schiff base ligands.

Compounds [Fe3 Ln(tea)2 (dpm)6 ] (Fe3 Ln; Ln= Tb-Yb, H3 tea=triethanolamine, Hdpm=dipivaloylmethane) were synthesized as lanthanide(III)-centered variants of tetrairon(III) single-molecule magnets (Fe4 ) and isolated in crystalline form. with Ln=Tb-Tm are isomorphous show crystallographic threefold symmetry. The coordination environment the rare earth, given by two tea(3-) ligands, can be described a bicapped distorted trigonal prism D3 Magnetic measurements showed presence weak...