Articolele autorului Constantin Mateescu
Link la profilul stiintific al lui Constantin Mateescu

Binary and Ternary Coordination Polymers in Aqueous Pb(II)-dicarboxylic acid-(phen) systems. The influence of O- and S-Ligand Heteroatoms on the Assembly of Distinct Lattice Architecture, Dimensionality and Spectroscopic Properties

Poised to understand the influence of O- and S-heteroatoms on the chemical reactivity of dicarboxylic acids toward Pb(II), leading to crystalline metal–organic hybrid materials with distinct lattice architecture, dimensionality, and spectroscopic properties, the synthesis and physicochemical properties of binary/ternary Pb(II)–(O,S)-dicarboxylic acid–(phenanthroline) systems was investigated in aqueous media. pH-specific hydrothermal reactions

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pH-Specific Synthesis, Spectroscopic, Structural and Magnetic, and Aqueous Solution Studies in the Binary Cr(III)-Quinato System

Chromium is widespread in the environment and is used in ample industrial applications in abiotic and biological systems. Its ability to influence biological processes through interactions with biomolecules underscores its positive role as well as its toxic manifestations in higher organisms. In an attempt to understand its (bio)chemistry, research efforts were undertaken to explore the aqueous chemistry of Cr(III) with the low molecular mass physiological

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pH-Specific Hydrothermal Assembly of Binary and Ternary Pb(II)-(O,N-Carboxylic Acid) Metal Organic Framework Compounds: Correlation of Aqueous Solution Speciation with Variable Dimensionality Solid-State Lattice Architecture and Spectroscopic Signatures

Hydrothermal pH-specific reactivity in the binary/ternary systems of Pb(II) with the carboxylic acids N-hydroxyethyliminodiacetic acid (Heida), 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetic acid (Dpot), and 1,10-phenanthroline (Phen) afforded the new well-defined crystalline compounds Pb(Heida)]n·nH2O(1), [Pb(Phen)(Heida)]·4H2O(2), and [Pb3(NO3)(Dpot)]n(3). All compounds were characterized by elemental analysis, FT-IR, solution or/and solid-state

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Aromatic Chelator-Specific Lattice Architecture and Dimensionality in Binary and Ternary Cu(II)-Organophosphonate Materials

Synthetic efforts linked to the design of defined lattice dimensionality and architecture materials in the binary/ternary systems of Cu(II) with butylene diamine tetra(methylene phosphonic acid) (H8BDTMP) and heterocyclic organic chelators (pyridine and 1,10-phenanthroline) led to the isolation of new copper organophosphonate compounds, namely, Na6[Cu2(BDTMP)(H2O)4]· Cu2(BDTMP)H2O)4]0.5·26H2O (1), [Cu2(H4BDTMP)(py)4 ] ·2H2O (2) , and [Cu2(H4BDTMP)-(phen)2]n·6.6nH2O·1.5nMeOH

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Coordination Polymeric Materials in Binary and Ternary Cu(II)-Tetracarboxylate-Bipy Systems. Structure-Reactivity Correlation in Cu(II)-(O,N) 1D-3D Lattice Assemblies

Cu(II) is a metal ion, the aqueous chemistry of which with carboxylic acids draws intense interest, targeting new materials and exemplifying diverse and unique structure–reactivity correlations. Driven by the need to explore the interplay of the chemical interactions of Cu(II) with polycarboxylic acid substrates and the association of such reactivity with lattice architecture and physicochemical properties, binary and ternary systems of Cu(II)

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pH-Specific Structural Speciation of the Ternary V(V)–Peroxido–Betaine System: A Chemical Reactivity-Structure Correlation

Vanadium involvement in cellular processes requires deep understanding of the nature and properties of its soluble and bioavailable forms arising in aqueous speciations of binary and ternary systems. In an effort to understand the ternary vanadium–H2O2–ligand interactions relevant to that metal ion’s biological role, synthetic efforts were launched involving the physiological ligands betaine (Me3N+CH2CO2–) and H2O2. In a pH-specific fashion,

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Tracking antioxidant properties and color changes in low-sugar bilberry jam as effect of processing, storage and pectin concentration

Background: Recently, an increased interest in the identification of valuable possibilities for preserving the antioxidant properties of products obtained by thermal processing of fruits rich in bioactive compounds can be noticed. In this regard, an extensive analysis is necessary in terms of thermal processed products behavior in relation to various factors. The purpose of the present study was to assess the effect which processing and storage at

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A unique dinuclear mixed V(V) oxo-peroxo complex in the structural speciation of the ternary V(V)-peroxo-citrate system. Potential mechanistic and structural insight into the aqueous synthetic chemistry of dinuclear V(V)-citrate species with H2O2

Diverse vanadium biological activities entail complex interactions with physiological target ligands in aqueous media and constitute the crux of the undertaken investigation at the synthetic level. Facile aqueous redox reactions, as well as nonredox reactions, of V(III) and V(V) with physiological citric acid and hydrogen peroxide, under pH-specific conditions, led to the synthesis and isolation of a well-formed crystalline material upon the addition

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A unique dinuclear mixed V(V) oxo-peroxo complex in the structural speciation of the ternary V(V)-peroxo-citrate system. Potential mechanistic and structural insight into the aqueous synthetic chemistry of dinuclear V(V)-citrate species with H2O2

Diverse vanadium biological activities entail complex interactions with physiological target ligands in aqueous media and constitute the crux of the undertaken investigation at the synthetic level. Facile aqueous redox reactions, as well as nonredox reactions, of V(III) and V(V) with physiological citric acid and hydrogen peroxide, under pH-specific conditions, led to the synthesis and isolation of a well-formed crystalline material upon the addition

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1D-3D Metal-Organic Lattice Assemblies through Chemical Reactivity and Metal-Assisted Ligand Transformations in Ternary Pb(II)-Phenanthroline-(Hydroxy)Dicarboxylic Acid Systems

Variable-pH hydrothermal reactions of Pb(II) with dicarboxylic acids in the presence of 1,10-phenanthroline led to new solid-state compounds [Pb2(C12H8N2)4(C4H2O4)](NO3)2 (1), [Pb2(C12H8N2)4(CO3)(C4H2O4)]n 3 6nH2O (2), [Pb2(C12H8N2)(C4H2O4)2]n (3), and [Pb(C12H8N2)(C4H2O4)]n 3 2nH2O (4). All compounds were characterized by elemental analysis, FT-IR, CP-MAS NMR, and single crystal X-ray diffraction. The collective chemical reactivity in the ternary

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