Isomeric [C,H3,N,O]+˙ ions and their neutral counterparts

The isomeric ions [H₂NC(H)O]⁺˙, [H₂NCOH]⁺˙, [H₃CNO]⁺˙ and [H₂CNOH]⁺˙ were examined in the gas phase by mass spectrometry. Ab initio molecular orbital theory was used to calculate the relative stabilities of [H₂NC(H)O]⁺˙, [H₂NCOH]⁺˙, [H₃NCO]⁺˙ and their neutral counterparts. Theory predicted [H₂NC(H)O]⁺˙ to be the most stable ion. [H₂NCOH]⁺˙ ions were generated via a 1,4-hydrogen transfer in [H₂NC(O)OCH₃]⁺˙, [H₂NC(O)C(O)OH]⁺˙ and [H₂NC(O)CH₂CH₃]⁺˙. Its metastable dissociation takes place via [H₃NCO]⁺˙ with the isomerization as the rate-determining step. [H₂CNOH]⁺˙ undergoes a rate-determining isomerization into [H₃CNO]⁺˙ prior to metastable fragmentation. Neutralization-reionization mass spectrometry was used to identify the neutral counterparts of these [H₃,C,N,O]⁺˙ ions as stable species in the gas phase. The ion [H₃NCO]⁺˙ was not independently generated in these experiments; its neutral counterpart was predicted by theory to be only weakly bound.     

Mass spectra of dihydroxy stereoisomers of 3-methoxy-1,3,5(10)-estratrienes

Electron impact mass spectral data for each of the four isomeric 16,17-, 15,17- and 14,17-diols of 3-methoxy-1,3,5(10)-estratriene and the 15,17-diols of 3-methoxy-14β-1,3,5(10)-estratriene are reported. The mass spectra of the diols show very similar fragmentation patterns except for differences in the relative abundances of particular ions. The different [M ? H₂O]⁺˙/[M] ⁺˙ and [M ? 2H₂O] ⁺˙ [M] ⁺˙ ratios can be used for distinguishing between the four isomeric 3-methoxy-1,3,5(10)-estratriene-14,17-diols as well as between the four isomeric 3-methoxy-14β-1,3,5(10)-estratriene-15,17-diols. No significant differences could be detected in the spectra of the epimeric 16,17-and 15,17-diols of 3-methoxy-1,3,5(10)-estratriene.     

Synthesis and spectroscopic characterization of aryloxide derivatives of titanium(IV) and zirconium(IV)

Homo- and heteroleptic aryloxides of the type MX_4–x(OAr)_x [M = Ti^IV, Zr^IV; X = OPrⁱ, Cl; x = 1,2,3,4; OAr = OC₆H₄Prⁱ-4(OAr¹), OC₆H₃Me-2-Prⁱ-5(OAr²), OC₆H₃Me-5-Prⁱ-2(OAr³), OC₆H₂Me₃-2,4,6(OAr⁴), OC₆H₃Bu^t₂-2,4(OAr⁵), OC₆H₃Bu^t₂-2,6(OAr⁶)] have been prepared either by alkoxo–aryloxo or chloro-aryloxo exchange reactions in benzene or tetrahydrofuran. All these new derivatives have been characterized by elemental analyses, spectroscopic (i.r., ¹H-, ¹³C-n.m.r.) studies and molecular weight measurements. The FAB mass spectral studies of four representative derivatives Support a dimeric nature for [Ti(OC₆H₃Me-5-Prⁱ-2)₄], [TiCl₂(OC₆H₃Me-5-Prⁱ-2)₂], and [Zr(OC₆H₃Bu^t₂-2,4)₄(thf)], whereas the derivative [ZrCl(OC₆H₃Bu^t₂-2,4)₃(thf)] is monomeric.     

Structure determination of [C3H3N2]+ ions,formed from monosubstituted pyrazoles C3H3N2R,by collision-induced dissociation mass spectrometry

[C₃H₃N₂]⁺ ions have been generated under electron impact conditions from some monosubstituted pyrazoles C₃H₃N₂R. Collision-induced dissociation (CID) mass spectra of deuterium-labelled precursors suggest that the majority of the [C₃H₃N₂]⁺ ions formed from 1-nitro- and 4-bromo-pyrazole retain their cyclic structure, whereas the ions from 3(5)-bromopyrazole are mainly linear. This is confirmed by the relative values observed for the overall cross-sections for CID and for ion loss. An isotope effect of the order of 1.5–1.9 has been found for the collision-induced loss of H^˙ from [C₃H₃N₂]⁺, generated from 3(5)- and 4-bromopyrazole.     

Gas phase reactivity of cation radicals and protonated species from isomeric C4H8S thioethers

Four isomeric thioethers, 2,3-dimethylthiirane ( 1 ), 2-methylthietane ( 2 ), tetrahydrothiophene ( 3 ), and allyl methyl thioether ( 4 ), have been subjected to mass spectrometric analysis in the gas phase, under electron impact (El) and chemical ionization (CI) conditions. The metastable molecular ions M⁺′ generated from 1-4 under EI (70 eV) conditions give distinct patterns of unimolecular fragmentation, thus indicating that isomer interconversion reactions are slower than dissociation (a possible exception, to some extent, is the case of [M₂]⁺′ and [M₂]⁺′). The change of the relative intensities of some prominent peaks with increasing ion lifetime (decomposition within the ion source, the first, and the second field-free regions of the mass spectrometer) is pointed out. Metastable [MH]⁺ ions, generated from 1-4 in chemical ionization experiments with CH₄, all eliminate H₂ and H₂S, although in different relative proportions. In addition to these processes protonated 4 also undergoes loss of C₂H₄ and C₃H₆, likely from a C-protonated structure.     

Synthesis of Deuterium Labeled Tryptamine Derivatives

The synthesis of deuterium labeled tryptamine derivatives, [2‐(1H‐indol‐3‐yl)‐[²H₄]‐ethyl]‐dimethylamine (DMT), [²H₁₀]‐diethyl‐[2‐(1H‐indol‐3‐yl)‐ethyl]‐amine (DET), [2‐(1H‐indol‐3‐yl)‐ethyl]‐[²H₆]‐dipropyl‐amine (DPT) and [²H₂]‐alpha‐methyltryptamine (AMT) is described. The isotopically labeled compounds are used as internal standards in gas chromatography‐mass spectrometry (GC‐MS) assays.     

A Pseudorotaxane System Containing γ-Cyclodextrin Formed via Chiral Recognition with an AuI6AgI3CuII3 Molecular Cap

Solvent-mediated crystal-to-crystal transformations of [Au₆Ag₃Cu₃(H₂O)₃(d -pen)₆(tdme)₂]³⁺ (d -[ 1 (H₂O)₃]³⁺; pen²⁻= penicillaminate, tdme=1,1,1-tris(diphenylphosphinomethyl)ethane) to form unique supramolecular species are reported. Soaking crystals of d -[ 1 (H₂O)₃]³⁺ in aqueous Na₂bdc (bdc²⁻=1,4-benzenedicarboxylate) yielded crystals containing d -[ 1 (bdc)(H₂O)₂]⁺ due to the replacement of a terminal aqua ligand in d -[ 1 (H₂O)₃]³⁺ by a monodentate bdc²⁻ ligand. When γ-cyclodextrin (γ-CD) was added to aqueous Na₂bdc, d -[ 1 (H₂O)₃]³⁺ was transformed to d -[ 1 (bdc@γ-CD)(H₂O)₂]⁺, where a γ-CD ring was threaded by a bdc²⁻ molecule to construct a pseudorotaxane structure. While the use of dicarboxylates with an aliphatic carbon chain instead of bdc²⁻ afforded analogous pseudorotaxanes, such pseudorotaxane species were not formed when crystals of [Au₆Ag₃Cu₃(H₂O)₃(l -pen)₆(tdme)₂]³⁺ (l -[ 1 (H₂O)₃]³⁺) enantiomeric to d -[ 1 (H₂O)₃]³⁺ were soaked in aqueous Na₂bdc and γ-CD, affording only crystals containing l -[ 1 (bdc)(H₂O)₂]⁺.     

Gasförmiges „H3PS2”︁ – Erzeugung und Charakterisierung

Gaseous “H₃PS₂” – Generation and Characterization Double alkene elimination from molecular ions (El: 70 eV) of dialkyldithiophosphinic acids R₂P(S)SH (R: Et, nPr, nBu) leads to radical cations of composition [H₃PS₂]^+. (m/z 98). By analysis of the collisional activation (CA) mass spectrum and using thermochemical data it was shown that [H₃PS₂]^+. exists as a mixture of structures [H? P(SH)₂]^+. and [HSP? SH₂]^+. containing tri- or dicoordinated phosphorus, respectively. No structure corresponding to ionized dithiophosphinic acid H₂P(S)SH was observed. Via neutralization reionization mass spectrometry (NRMS) neutral molecules ?H₃PS₂”? were obtained which proved to be stable in the dilute gas phase and most probably are of structure H? P(SH)₂. Experimental findings are in accordance with the results of semiempirical MO-calculations (MNDO).     

Synthesis and Circular Dichroism of Both Enantiomers of 2-deuterofluoroacetic acid ( Fluoro[2H1]acetic acid)

Sharpless epoxidation of (E)-1-(trimethylsilyl)[1-²H₁]oct-1-en-3-o1 ( 3a ) yielded (1S,2S,3S)- and (1R,2R,3R)-1-(trimethylsilyl)-1,2-epoxy[1-²H₁]octan-3-ols ( 4a and 4b , resp.) which were converted in three steps into (S)- and (R)-fluoro[ ²H₁]acetic acid ( 7a and 7b , resp.) in good yields. Their high isotopic and optical purity was established by ¹H- and ¹⁹F-NMR, mass, and circular-dichroism spectroscopy.     

Charge stripping mass spectra: A method for identifying isomeric [C5H8]+˙ and [C3H6]+˙ ions

Charge stripping (collisional ionization) mass spectra are reported for isomeric [C₅H₈]⁺˙ and [C₃H₆]⁺˙ ions. The results provide the first method for adequately quantitatively determining the structures and abundances of these species when they are generated as daughter ions. Thus, loss of H₂O from the molecular ions of cyclopentanol and pentanal is shown to produce mixtures of ionized penta-1,3- and -1,4-dienes. Pent-1-en-3-ol generates [penta-1,3-diene]⁺˙. [C₃H₆]⁺˙ ions from ionized butane, methylpropane and 2-methylpropan-1-ol are shown to have the [propene]⁺˙ structure, whereas [cyclopropane]⁺˙ is produced from ionized tetrahydrofuran, penta-1,3-diene and pent-1-yne.     

Reactions of cisplatin hydrolytes, cis-[Pt(15NH3)2(H2O) 2]2+, with N-acetyl-L-cysteine

The reaction of cis-[Pt(¹⁵NH₃)2(H₂O) ₂] ²⁺ (3) with N-acetylcysteine [H₃accys] was investigated in aqueous solution. In this reaction, the ammine in the platinum complex formed was liberated. A mono-dentate sulfur-boundplatinum(II) product cis-[Pt(¹⁵NH₃)₂(H₂O)(H2accys-S)]⁺ (7) and six-membered che-late ring complex cis-[Pt(¹⁵NH₃)₂ (Haccys-S,O)] (8) were formed in solution. The dinuclear sulfur-bridged complex 9, giving a broad peak in ¹⁵N NMR, was also observed, but only present in very tiny amounts. The mass spectrometry (ES-MS) was undertaken from this re action, and the product detected was only the dinuclear sulfur bridged platinum species and species related to it by ammine loss.     

Soluble Monometallic Salen Complexes Derived from O‐functionalized Salicylaldehydes as Metalloligands for the Synthesis of Heterobimetallic Complexes

The reaction of 2,3‐diamino‐2,3‐dimethylbutane (tmen) with 3‐hydroxysalicylaldehyde (3hsal), 4‐hydroxysalicylaldehyde (4hsal), and 5‐hydroxysalicylaldehyde (5hsal) or 3‐carboxysalicylaldehyde (3csal) gave the hydroxy‐functionalized salen ligands H₄3hsaltmen, H₄4hsaltmen and H₄5hsaltmen, or the 3‐carboxy‐functionalized ligand H₄3csaltmen, which were characterized by ¹H, ¹³C{¹H} NMR and IR spectroscopy. The nickel(II) and copper(II) complexes [Ni(H₂3hsaltmen)], [Ni(H₂4hsaltmen)], [Ni(H₂5hsaltmen)], [Cu(H₂3hsaltmen)] and [Cu(H₂4hsaltmen)] were synthesized in high yield (78–99 %) starting from H₄3hsaltmen, H₄4hsaltmen and H₄5hsaltmen and the corresponding metal(II) acetates. The complexes are soluble in acetone, ethanol, methanol, thf and dmso. The reaction of H₄3csaltmen and nickel(II) acetate gave [Ni(H₂3csaltmen)] in 40 % yield. The disodium salt of the corresponding copper(II) complex [Cu(Na₂3csaltmen)] was obtained in 66 % yield in a template reaction from 3‐carboxysalicylaldehyde, tmen, copper(II) acetate and sodium hydroxide, and was characterized by EPR spectroscopy and mass spectrometry. All complexes were identified by IR spectroscopy and elemental analysis, the nickel complexes also by NMR spectroscopy, and [Ni(H₂3hsaltmen)], [Ni(H₂4hsaltmen)] and [Ni(H₂3csaltmen)] by X‐ray crystallography. The homobinuclear copper complex [Cu₂(3hsaltmen)] was prepared in 91 % yield from H₄3hsaltmen, two equivalents of Cu(CH₃COO)₂·H₂O and four equivalents of LiOH·H₂O and was characterized by IR spectroscopy, elemental analysis and mass spectrometry. The trinuclear complex [Zr{Ni(3hsaltmen)}₂] was obtained from [Zr(NEt₂)₄] and [Ni(H₂3hsaltmen)] (ratio 1:2) and characterized by FAB and APPI mass spectrometry and X‐ray crystallography. The redox potential of the trinuclear complex [Zr{Ni(3hsaltmen)}₂] is shifted by 0.04 V to positive potential compared to [Ni(H₂3hsaltmen)], while the redox potential of the binuclear copper complex [Cu₂(3hsaltmen)] is shifted by 0.22 V to negative potential compared to [Cu(H₂3hsaltmen)].     

Synthesis and characterization of copper(II) and cobalt(II) complexes with two new potentially hexadentate Schiff base ligands. X-ray crystal structure determination of one copper(II) complex

Two new potentially hexadentate N₂O₄ Schiff base ligands 2-((z)-(2-(2-(2-((z)-3,5-di-tert-butyl-2-hydroxybenzylideneamino) phenoxy) phenoxy) phenylimino) methyl)-4,6-di-tert-butylphenol [H₂L¹] and 2-((z)-(2-(2-(2-((z)-3,5-di-tert-butyl-2-hydroxybenzylideneamino) phenoxy)-5-tert-butylphenoxy) phenylimino) methyl)-4,6-di-tert-butylphenol [H₂L²] were prepared from the reaction of 3,5-di-tert-butyl-2-hydroxy benzaldehyde with 1,2-bis(2′-aminophenoxy)benzene or 1,2-bis(2′-aminophenoxy)-4-t-butylbenzene, respectively. From the direct reaction of ligands [H₂L¹] and [H₂L²] with copper(II) and cobalt(II) salts in methanolic solution and in the presence of N(Et)₃ the neutral [CuL¹], [CuL²], [CoL¹] and [CoL²] complexes were prepared. All complexes were characterized by IR spectra, elemental analysis, magnetic susceptibility, mass spectra, molar conductance (Λ_m), UV-Vis spectra and in the case of [CuL²] with X-ray diffraction. X-ray crystal structure of [CuL²] showed that the complex contains copper(II) in a distorted square planar environment of N₂O₂ donors. Three CH/π interactions were observed in the molecular structure of latter complex.     

Synthesis and characterization of substituted aminobiphenylglyoximes and their complexes with some transition metals

In this study, four different new vic-dioximates, [L¹H₂] N-(4-ethylphenyl)amino-biphenylglyoxime, [L²H₂] N-(4-butylphenyl)aminobiphenylglyoxime, [L³H₂] N-(4-aminoacetanilide)aminobiphenylglyoxime, and [L⁴H₂] N-(thiazol-2-yl-aminobiphenylglyoxime are synthesized from anti-4′-biphenylchloroglyoxime and the corresponding substituted aromatic amines. The Co(II), Ni(II), and Cu(II) complexes of these ligands are prepared. The structures of these new ligands and their complexes are proposed based upon IR, ¹H, and ¹³C NMR spectral data, mass spectroscopy, magnetic susceptibility measurement, and elemental analyses. The text was submitted by the authors in English.     

Synthesis of four new vic-dioximes and their nickel(II), cobalt(II), copper(II) and cadmium(II) complexes

Four unsymmetrical vic-dioximes: [L¹H₂] N-(4-butylphenyl)amino-amphi-glyoxime, [L²H₂] N-(4-butylphenyl)amino-anti-glyoxime, [L³H₂] N-(4-phenylazophenyl)amino-amphi-glyoxime and [L⁴H₂] N-(4-phenylazophenyl)amino-anti-glyoxime have been prepared from amphi-chloroglyoxime, anti-chloroglyoxime, 4-butylaniline and 4-(phenylazo)aniline respectively. The complexes of these vic-dioximes with Ni^II, Co^II, Cu^II and Cd^II ions have been investigated. All are insoluble in common solvents. Their i.r. spectra and elemental analyses are given, together with mass and ¹H-n.m.r. spectra of the ligands.     

Synthesis,spectral, thermal and crystallographic investigations on oxovanadium(IV) and manganese(III) complexes derived from heterocyclic β-diketone and 2-amino ethanol

Novel mononuclear oxovanadium(IV) and manganese(III) complexes [VO(L¹)₂·H₂O] (1); [VO(L²)₂·H₂O] (2); [VO(L³)₂·H₂O] (3); [Mn(L¹)₂]ClO₄·H₂O (4); [Mn(L²)₂] ClO₄·H₂O (5); [Mn(L³)₂]ClO₄·H₂O (6) were prepared by condensation of 1 mol of VOSO₄·5H₂O or Mn(OAc)₃· 2H₂O with 2 mol of ligand HL¹, HL² or HL³ (where HL¹ = 4-[(2-hydroxy-ethylamino)-methylene]-5-methyl-2- phenyl-2,4-dihydro-pyrazol-3-one; HL²=4-[(2-hydroxy-ethylamino)-methylene]-5-methyl-2-p-tolyl-2,4-dihydro-pyrazol-3-one; HL³=4-{4-[(2-hydroxy-ethyl-amino)-methyl]-3-methyl-5-oxo-4,5-dihydropyrazol-1-yl} benzene sulfonic acid). The resulting complexes were characterized by elemental analyses, molar conductance, magnetic and decomposition temperature measurements, electron spin resonance, FAB mass, IR and electronic spectral studies. From TGA, DTA and DSC, the thermal behaviour and degradation kinetic were studied. Electronic spectra and magnetic susceptibility measurements indicate distorted octahedral stereochemistry of oxovanadium(IV) complexes and regular octahedral stereochemistry of manganese(III) complexes. Hamiltonian and bonding parameters found from ESR spectra indicate the metal ligand bonding is partial covalent. The X-ray single crystal determination of one of the representative ligand was carried out which suggests existence of amine-one tautomeric form in the solid state. The ¹H-NMR spectra support the existence of imine-ol form in solution state. The LC-MS studies sustain the¹H-NMR result. The electronic structure of the same representative ligand was optimized using 6-311G basis set at HF level ab initio studies to predict the coordinating atoms of the ligand.     

Carbon randomization in the fragmentation of [C4H9]+ derived from t-butyl derivatives

The mass spectrum of ¹³C centrally labeled neopentane has been re-examined at a mass resolution sufficient to resolve ¹³C-CH mass doublets. Contrary to earlier low resolution results, the [C₃H₅]⁺ fragment ion is formed with 75% retention of the central carbon under all experimental conditions, indicating complete carbon scrambling in the fragmentation reaction [C₄H₉]⁺→[C₃H₅]⁺ + CH₄. The higher retention of the central carbon in [C₃H₅]⁺ in the mass spectra of (CH₃)₃CCl and (CH₃)₃CBr is shown to be due to the occurrence of the reaction sequence      

Dioxomolybdenum(VI) complexes of hydrazone phenolate ligands - syntheses and activities in catalytic oxidation reactions

The new cis-dioxomolybdenum (VI) complexes [MoO₂(L²)(H₂O)] (2) and [MoO₂(L³)(H₂O)] (3) containing the tridentate hydrazone-based ligands (H₂L² = N'-(3,5-di-tert-butyl-2-hydroxybenzylidene)-4-methylbenzohydrazide and H₂L³ = N'-(2-hydroxybenzylidene)-2-(hydroxyimino)propanehydrazide) have been synthesized and characterized via IR, ¹H and ¹³C NMR spectroscopy, mass spectrometry, and single crystal X-ray diffraction analysis. The catalytic activities of complexes 2 and 3, and the analogous known complex [MoO₂(L¹)(H₂O)] (1) (H₂L¹ = N'-(2-hydroxybenzylidene)-4-methylbenzohydrazide) have been evaluated for various oxidation reactions, viz. oxygen atom transfer from dimethyl sulfoxide to triphenylphosphine, sulfoxidation of methyl-p-tolylsulfide or epoxidation of different alkenes using tert-butyl hydroperoxide as terminal oxidant. The catalytic activities were found to be comparable for all three complexes, but complexes 1 and 3 showed better catalytic performances than complex 2, which contains a more sterically demanding ligand than the other two complexes.     

Alkali Metal/Ammonia Reductions of Ketones Should Be Run in the Presence of Ammonium Ion

Reduction of (+)-[3,3?²H₂]camphor ([3,3?²H₂] 1 ) with lithium, sodium or potassium in ammonia and a co-solvent gave; 1) the enolate of [3,3?²H₂] 1 and the alcoholates of (?)-[2,3,3?²H₃]isoborneol ([2,3,3?²H₃] and (+)-[2,3,3?²H₃]borneol ([2,3,3?²H₃] 3 ); 2) the alcoholates of [3,3?²H₂] 2 and [3,3?²H₂] 3 ; 3) the dialcoholates of the pinacols [3,3,3′,3′?²H₄] 4 and [3,3,3′,3′?²H₄] 5 . It is proposed that these are formed from the ketyls [3,3?²H₂] 1 - M⁺, by: 1) disproportionation; 2) H-atom abstraction from the medium; 3) dimerization. Protonation upon work-up afforded [endo?3²H] 1 , [2,3,3?²H₃] 2 , [2,3,3?²H₃] 3 ,[3,3?²H₂] 2 , [3,3?²H₂] 3 , [3,3,3′,3′?²H₄] 4 and [3,3,3′,3′?²H₄] 5 . Pinacol [3,3,3′,3′?²H₄] 5 was the main and pinacol [3,3,3′,3′?²H₄] 4 a minor product in the reductions with lithium and both were minor products in the reductions with sodium; pinacols were not formed in the reductions with potassium. Parallel reductions of 1 , unlabeled, analogously led to 2 , 3 , 4 and 5 , and the ratios 2/3 differed from the ratios ([2,3,3?²H₃] 2 +[3,3?²H₂] 2 /([2,3,3?²H₃]+[3,3?²H₂] 3 ) under certain conditions. Different values for these ratios were found in the reductions with each metal, all of which corresponded to low overall diastereoselectivities. Reactions 1 and 3 persisted when the reductions were carried out in ammonia/water/co-solvent mixtures and the enolate formed via reaction 1 was protonated and the resulting [endo-3-²H] 1 recycled. Reaction 2 cannot be monitored under these conditions. Reactions 1 and 3, and by inference also reaction 2, were almost completely suppressed when analogous reductions were carried out in the presence of ammonium chloride, [3,3?²H₂] 2 and [3,3?²H₂] 3 being obtained almost exclusively, in a 6: 94 ratio. It is proposed that the mechanism outlined in House [1] was dominant when, and only when, ammonium ion was the proton source; it may have competed when water was the proton source.     

Syntheses,equilibrium, and structural studies of copper(II) and nickel(II) complexes with a tripodal alanine-based ligand

A heptadentate ligand, tris[(L)-alanyl-2-carboxamidoethyl]amine (H₃trenala), has been synthesized as its tetrahydrochloride salt; its protonation constants and the stability constants of the copper(II) and nickel(II) chelates have been determined by potentiometry. Mononuclear species with protonated, neutral, or deprotonated forms of the ligand, [Cu(H₅trenala)]⁴⁺, [M(H₄trenala)]³⁺, [M(H₃trenala)]²⁺, [M(H₂trenala)]⁺, and [M(Htrenala)] (M?=?Cu²⁺ and Ni²⁺) have been detected in all cases, while only Cu²⁺ gives dinuclear [Cu₂(H₂trenala)]²⁺, [Cu₂(Htrenala)]²⁺, [Cu₂(trenala)]⁺, and [Cu₂(trenala)(OH)] species. Two dinuclear copper(II) complexes have been prepared and characterized by spectroscopic techniques (IR, UV-Vis, mass electro-spray) and thermogravimetric analysis.