Jorge Henrique Santos Klier Monteiro

• PhD in Chemistry
• Professor (Assistant) at California State Polytechnic University, Humboldt

The luminescence properties of two divalent europium complexes of the type Eu[N(SPPh2)2]2(THF)2 (1) and Eu[N(SePPh2)2]2(THF)2 (2) were investigated. The first complex, Eu[N(SPPh2)2]2(THF)2 (1), was found to be isomorphous with the reported structure of complex 2 and exhibited room temperature luminescence with thermochromic emission upon cooling. W...

EuIII and YbIII complexes with the carbazole-dipicolinato ligand dpaCbz²⁻, namely K3[Eu(dpaCbz)3] and K3[Yb(dpaCbz)3], were isolated. The EuIII complex displayed metal-centred emission upon one-photon excitation with a sensitized emission efficiency ΦLLn of 1.8±0.3%, corresponding to an intrinsic emission efficiency ΦLnLn of 46% and a sensitization...

SYNTHESIS, CHARACTERIZATION AND JUDD-OFELT ANALYSIS OF Eu(III) OR Sm(III) β-DIKETONATE COMPLEXES. The lanthanide complexes [Ln(bmdm)3(L)] where Ln(III) = Eu and Sm were synthesized successfully using the diketone (1-(4-methoxyphenyl)-3-(4-tert-butylphenyl) propane-1,3-dione) (bmdm) and (L) = 1,10-phenanthroline (phen), 2,2’-bipyridine (bipy) ligand...

Er III -Centered upconversion emission in Ln III complexes with a cyano-naphthylsalophen ligand.

We report the solution structure of a europium-nicotianamine complex predicted from ab initio molecular dynamics simulations with density functional theory. Emission and excitation spectroscopy show that the Eu3+ coordination environment changes in the presence of nicotianamine, suggesting complex formation, such as what is seen for the Eu3+-nicoti...

Two series of lanthanide-containing metal-organic frameworks (Ln-MOFs) of the general formula {[Ln(HIDA)2H2O]ClO4·H2O}n (Ln= La (1), Nd (2), Eu (3), Gd (4), Tb (5), Eu:Tb (6); H2IDA = iminodiacetic acid) and [Ln(TT)(HTT)(H2O)3]n (Ln= Eu (7), Gd (8), Tb (9), Dy (10), and Eu:Tb (11); H2TT = tartaric acid) were synthesized by reacting Ln(ClO4)3 with i...

The blue emission of M2biQ can be tuned to specific wavelengths throughout the visible region by changing the identity of the cation it interacts with. These optical properties are observed in MeCN solution and the solid state. White light is obtained in MeCN by using either the proper ratio of zinc ions or acid. Thus, M2biQ acts as a nearly univer...

The use of luminescence in biological systems allows us to diagnose diseases and understand cellular processes. Persistent luminescent materials have emerged as an attractive system for application in luminescence imaging of biological systems; the afterglow emission grants background-free luminescence imaging, there is no need for continuous excit...

Four groups of rare-earth complexes, comprising 11 new compounds, with fluorinated O-donor ligands ([K(THF)6][Ln(OC4F9)4(THF)2] (1-Ln; Ln = Ce, Nd), [K](THF) x [Ln(OC4F9)4(THF) y ] (2-Ln; Ln = Eu, Gd, Dy), [K(THF)2][Ln(pinF)2(THF)3] (3-Ln; Ln = Ce, Nd), and [K(THF)2][Ln(pinF)2(THF)2] (4-Ln; Ln = Eu, Gd, Dy, Y) have been synthesized and characterize...

The use of luminescence in biological systems allows one to diagnose diseases and understand cellular processes. Molecular systems, particularly lanthanide(III) complexes, have emerged as an attractive system for application in cellular luminescence imaging due to their long emission lifetimes, high brightness, possibility of controlling the spectr...

We report the solution structure of a europium-nicotianamine complex predicted from ab initio molecular dynamics simulations with density functional theory. Emission and excitation spectroscopy measurements show that the Eu³⁺coordination environment changes in the presence of nicotianamine, suggesting complex formation, and strongly supp...

The newly synthesized EuIII and YbIII complexes with the new carbazole-based ligands CPAD2- and CPAP4- display the characteristic long-lived metal-centered emission upon one- and two-photon excitation. The EuIII complexes show the expected narrow emission bands in the red region, with emission lifetimes between 0.382 and 1.464 ms and quantum yields...

A series of tetrakis-β-diketonate Q+[Ln(β-dik)4]–, where Ln = GdIII or EuIII, Q = ammonium cations and β-dik = tta (2-thenoyltrifluoracetone) or bmdm (1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)-1,3-propanedione) have been synthesized and characterized. The environment surrounding the EuIII ion depends on the lateral groups of the ligand and on the...

This work explores the syntheses, structures, photophysical properties, and photostability of benzodipyrenes (BDPs). BDPs were synthesized through an InCl3‐AgNTf2‐catalyzed, four‐fold alkyne benzannulation reaction. The structures of BDP 4 a and its corresponding endoperoxide product were unambiguously confirmed by X‐ray crystallography. The BDPs r...

We isolated a coordination polymer with the formula [Eu3(3,5-dcba)9(H2O)(dmf)3]·2dmf, with three unique EuIII coordination sites in the asymmetric unit, with the EuIII ions bridged by 3,5-dichlorobenzoato (3,5-dcba) ligands. The coordination polymer crystallized in the triclinic space group P1̅ with unit cell dimensions a = 12.4899(15), b = 16.326(...

The water soluble [Tb(dipicCbz)3]³⁻ (dipicCbz = 4-(9H-carbazol-9-yl-)pyridine-2,6-dicarboxylato) complex was isolated and evaluated as a temperature sensor in water. The 1:3 (TbIII:dipicCbz²⁻) stoichiometry in solution was confirmed by luminescence titration and high-resolution mass spectrometry. The quantum yield of sensitized emission is 3.8% ± 0...

Four new lanthanide complexes with the ligand dipicNH 2²⁻ (dipic = dipicolinato) show selective cancer cell toxicity and are used for cell luminescence imaging.

We synthesized CDs that were crystalline and monodisperse with average diameters in the range 4-5nm. The CDs had a fluorescence quantum yield of 0.20%, with emission lifetimes of 3.1 and 6.5ns attributed to surface and core emissions, respectively. ¹³C NMR spectroscopy indicated the presence of C-C, C[U+02ED]C and C[U+02ED]O groups on the surface o...

In this work, Mn doped AIZS/ZnS (Mn:AIZS/ZnS) nanocrystals (NCs) have been synthesized in an approach using heat-up and drop-wise addition of precursors. On the basis of the characterization of these doped NCs on their optical properties and materials, it is found that: (1) as more Mn atoms are doped into NCs, the doped NCs present photoluminescenc...

Rare earth (RE) tungstates with general formula REW2O6(OH)3 (RE = YIII or EuIII) were synthesized by hydrothermal method by using different citric acid contents. The prepared samples exhibit both UV and X-ray-induced photochromism at room temperature, as well as photomodulated luminescence. The presence of citric acid residues improves the photochr...

The influence of the donor-acceptor distance RL on the photophysical properties, including the emission quantum yield, of two europium complexes with the same coordination number, and thus similar microsymmetries, was investigated by spectroscopic and computational methods. K3[Eu(dipicCbz)3] was synthesized using the new ligand dipicCbz and its pho...

The cover picture shows the ultraviolet (UV) irradiation of a novel sophisticated chromophore-containing ligand chelated to luminescent trivalent lanthanide metal ion i.e., Europium(III) or Terbium(III). This ligand is based on two O-bridged quinolines bearing carboxylate moieties to reinforce both the coordination to the central metal ion and the...

We synthesized thiophene-functionalized pyrene, peropyrene, and teropyrene through a two- or four-fold alkyne annulation reaction promoted by triflic acid. All of the target compounds were fully characterized spectroscopically, and the structure of the peropyrene analogue was unambiguously confirmed by X-ray crystallography. A significant red shift...

The syntheses, structures, and luminescence properties of a series of copper(I) halide coordination polymers, prepared with mono- and bidentate N-heteroaromatic ligands, are reported. These metal-organic coordination networks form [Cu2I2L]n for bidentate ligands (where L = pyrazine (1), quinazoline (2)) and [CuIL]n for monodentate ligands (where L...

A novel ligand based on a O-bridged symmetrical bis-quinoline containing carboxylate moieties has been synthesized and its coordination and sensitization ability for lanthanide ions has been studied in aqueous solution. The efficient 7-step methodology developed starts from commercial 8-methylquinoline. This new heterocycle, which was characterized...

The design of a relatively simple and efficient method to extend the π-conjugation of readily available aromatics in one-dimension is of significant value. In this paper, pyrenes, peropyrenes, and teropyrenes were synthesized through a double or quadruple benzannulation reaction of alkynes promoted by Brønsted acid. This novel method does not invol...

The design of a relatively simple and efficient method to extend the π-conjugation of readily available aromatics in one-dimension is of significant value. In this paper, pyrenes, peropyrenes, and teropyrenes were synthesized through a double or quadruple benzannulation reaction of alkynes promoted by Brønsted acid. This novel method does not invol...

New water-soluble lanthanide complexes with a poly glycol chain (-OEtOEtOEtOMe) functionalized benzoic acid derivative ligand were synthesized and photophysically characterized. The results indicate a formation of an asymmetric dinuclear lanthanide complexes. The [Eu2(mee)6(H2O)2] complex shows emission in water solution and it was noted that after...

A new oxygen sensitive optical probe based on the [Tb(3,5-dcba)3]*1/2H2O (3,5-dcba = 3,5-dichlorobenzoate) complex chemically bonded to a phosphine oxide-functionalized polydimethylsiloxane is presented in this communication. The oxygen sensitive hybrid material shows green emission and transparency in the visible spectral range. The optical sensit...

a The ligands 4-fluorobenzoate (4-fba), 4-chlorobenzoate (4-cba), 4-bromobenzoate (4-bba) and 4-iodobenzoate (4-iba) were chosen in order to synthesize europium(III), gadolinium(III) and terbium(III) complexes and compare the effect of halogens on their physical chemistry and luminescent properties. The homobimetallic complex [Eu(4-iba) 3 (H 2 O)(d...

Well dispersed non-stabilized lanthanum oxyfluoride and fluoride nanoparticles were prepared in situ in thin silica films from rapid thermal decomposition of lanthanum tris-trifluoroacetate under nitrogen atmosphere. The thin silica films were obtained from sol–gel method and spin-coating. The spectroscopic properties of the non-stabilized nanopart...

The synthesis, characterization and formation of Langmuir–Blodgett (LB) films for the luminescent [(C12H25)2(CH3)2N][Eu(tta)4] complex, where [(C12H25)2(CH3)2]N+ is didodecyldimethylammonium and the tta ligand is thenoyltrifluoroacetone, are reported. The coordination of tta ligands to the Eu3+ ion was confirmed by FTIR spectroscopy and the emissio...

This work reports an alternative aproach to obtain the Judd-Ofelt intensity parameters of Sm(III) complexes with the general formula: [Sm(tta)(3)(L)(n)], with L = H(2)O, triphenylphosphine oxide (tppo), 2,2'-bipyridine (bipy) and 1,10-phenantroline (phen); n = 2 for H(2)O and tppo and n = 1 for phen and bipy, using the absorption spectra of rare ea...

This paper reports the study of structural and luminescence parameters of a seven-coordination compound containing β-diketone butyl methoxy-dibenzoyl-methane (bmdm) and triphenylphosphine oxide (tppo), both acting as antennae. The complex was obtained by substitution of water molecules in the [RE(bmdm)3(H2O)2] precursor, where RE = Eu3+ or Gd3+. Th...

The reaction of 2,6-diformylpyridine-bis(benzoylhydrazone) [dfpbbh] and 2,6-diformylpyridine-bis(4-phenylsemicarbazone) [dfpbpsc] with lanthanides salts yielded the new chelates complexes [Eu(dfpbpsc–H+)2]NO3 (1), [Dy(fbhmp)2][Dy(dfpbbh–2H+)2]·2EtOH·2H2O (fbhmp=2-formylbenzoylhydrazone-6-methoxide-pyridine; Ph=phenyl; Py=pyridine; Et=ethyl) and [Er...

Deprotonated 3-(4-nitrophenyl)-1-phenyltriazene N-oxide reacts with YCl3·6H2O and LnCl3·6H2O (Ln=Eu, Ho, Yb) to give the monoclinic chelate complexes [Y{O2N(C6H4)NNN(O)Ph}4](Et3NH)·H2O (1) (Ph=C6H5; Et=C2H5) and [LnIII{O2N(C6H4)NNN(O)Ph}4](Et3NH)·H2O·{CH3OH∗} {LnIII=Eu (2), Ho (3), Yb∗ (4), in which the metal centers present a square antiprismatic...

Este artigo discute a política antiinflacionária dos anos 1990 ("Plano Real") em sua moldura constitucional, na tradição do programa de pesquisa da public choice, revelando aspectos que as análises econômicas convencionais não contemplam: deterioração do sistema de separação de poderes; intensificação do poder discricionário dos burocratas federais...

Este artigo discute a política antiinflacionária dos anos 1990 ("Plano Real") em sua moldura constitucional, na tradição do programa de pesquisa da public choice, revelando aspectos que as análises econômicas convencionais não contemplam: deterioração do sistema de separação de poderes; intensificação do poder discricionário dos burocratas federais...

As principais dimensões das escolhas públicas na economia brasileira, estabelecidas a partir do modelo da public choice. Esse foco, quando aplicado a uma economia que opera sob regras instáveis, como é o caso do Brasil, permite que melhor se entenda o funcionamento dos mecanismos da intermediação política, em sua relação com as propriedades dos res...

The main dimensions of economic policy in the Brazilian economy based on the public choice model. This approach, when applied to an economy that operates under unstable rules, as is the case of Brazil, allows a better understanding of how political mediation mechanisms work in their relationship with the properties of public policy results. Special...