- Synthesis, crystallographic and spectroscopic studies of dimeric Cui complexes with Schiff-base-containing triazole ligands
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New CuI complexes of the Schiff-base-containing triazole ligands N-[(E)-(4-chlorophenyl)methylidene]-4H-1,2,4-triazol-4-amine (C1Phtrz) and N-[(E)-phenylmethylidene]-4H-1,2,4-triazol-4-amine (Phtrz) have been synthesised and characterised. Depe
- Drabent, Krzysztof,Ciunik, Zbigniew,Chmielewski, Piotr J.
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- Multiple correlations between spin crossover and fluorescence in a dinuclear compound
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Multiple correlations between spin crossover and fluorescence are established in a dinuclear compound with fluorescence from d(Fe) + π(SCN) to π*(ligand) charge transfer and correlation originated from ligand to Fe(ii) energy transfer.
- Wang, Chun-Feng,Sun, Ming-Jun,Guo, Qi-Jie,Cao, Ze-Xing,Zheng, Lan-Sun,Tao, Jun
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supporting information
p. 14322 - 14325
(2016/12/16)
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- Dinuclear complexes with a triple N1,N2-triazole bridge that exhibit partial spin crossover and weak antiferromagnetic interactions
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The reaction of 4-phenylimino-1,2,4-triazole (1) with FeII, CoII, NiII and CuII thiocyanate produces a series of analogous dinuclear compounds of formula [M2 (1)5 (NCS)4] (2-5) as demonstrated by single-crystal X-ray diffraction studies of the FeII (2) and CoII (3) analogues. The magnetic properties of [Fe2(1)5(NCS)4]·xMeOH (x = 3.5-5) reveal a partial and gradual spin crossover (SCO) centred at TSCO = 115 K. This is confirmed by its crystal structure solved at 100, 150 and 250 K, which exhibits a gradual decrease of the Fe-N bond lengths with temperature. However, the bulk hydrated form of 2 that is generated upon exposure to air of crystals is a high-spin compound that exhibits weak antiferromagnetic interaction. The exchange coupling among the FeII S = 2 ions within the dinuclear neutral complex was evaluated as J/kB = -1.33(3) K by using the Heisenberg Hamiltonian H = -2JS1·S2. Similarly, the magnetic properties of the NiII (4) and CuII (5) analogues are dominated by moderate and weak antiferromagnetic interactions evaluated as J/kB = -13.9(3) and -0.30(5) K, respectively. The presence of strong spin-orbit coupling of the individual CoII ions impeded the evaluation of the likely antiferromagnetic interaction that leads to a singlet ground state in 3. The reported structures of 2 and 3 are new additions to a very scarce family of dinuclear complexes bearing a unique triple N1,N2-triazole bridge. Owing to its relevance in the peculiar properties of 1D triazolebased SCO materials, which are widely studied for their various potential applications, a structural analysis of this triple N1,N2-triazole bridge in reported structures of FeII and CoII trinuclear and 1D compounds is provided.
- Roubeau, Olivier,Gamez, Patrick,Teat, Simon J.
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p. 934 - 942
(2013/06/26)
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- Synthesis and biological activity of 3-[4H-(1,2,4)-Triazolyl]-2,6-diaryl-1, 3,5-oxadiazine-4-thione
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4-Amino-1,2,4-triazole (1) undergoes facile condensation with aromatic aldehydes to afford the corresponding 4-(arylidene-amino)-4H-[1,2,4]-triazole (2a-h) in good yield. Rearrangement of compounds (2a-h) with benzoyl isothiocyanate/4-chloro-benzoyl isoth
- Patel, Hasmukh S.,Patel, Ketan B.
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experimental part
p. 2443 - 2452
(2010/07/04)
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- Synthesis and biological activity of 3-[4H-(1,2,4)-triazolyl]-2-aryl-1,3- thiazolidin-4-ones
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4-Amino-1,2,4-triazole (1) undergoes facile condensation with aromatic aldehydes to afford the corresponding 4-(arylidene-amino)-4H-[1,2,4]-triazole (2 a-h) in good yields. Cyclocondensation of compounds (2 a-h) with thioglycolic acid yields 3-[4H-(1,2,4)
- Patel,Patel
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experimental part
p. 2391 - 2398
(2009/08/07)
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- Synthesis and investigation of the conformational mobility of certain (N-benzyl-N-nitrosoamino)azoles
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The N-benzyl-N-nitroso derivatives of 1- and 4-amino-1,2,4-triazoles, and 2-amino-5-phenyltetrazoles, 1-aminobenzotriazole, 7-amino-8-methyltheophylline, and 1-amino-3-methylbenzimidazol-2-one have been synthesized. The ratio of E- and Z-forms for them, a
- Dyablo,Mikhailus,Pozharskii,Trishkin
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p. 329 - 339
(2007/10/03)
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- Rearrangement of N-(Alkylamino)azoles in Acid Media: A New Entry to C-Amino-N-substituted Azoles
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A ring-opening / ring-closure mechanism for the thermal rearrangement of 1-(alkylamino)pyrazoles into 5-amino-1-alkylpyrazoles in acid medium has been established. 1-(Benzylamino)pyrazoles show a different reactivity, affording bis(5-amino-1-benzyl-4-pyrazolyl)phenylmethanes.The reaction was extended to 1-(alkylamino)indazoles but failed in the case of 1-(alkylamino)-1,2,4-triazoles.
- Salazar, Loreto,Espada, Modesta,Avendano, Carmen,Claramunt, Rosa Maria,Sanz, Dionisia,Elguero, Jose
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p. 1563 - 1567
(2007/10/02)
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- Synthesis of organophosphorus compounds via silyl esters of phosphorous acids
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The addition of trimethylsilyloxy phosphorus (III)derivatives generated in situ to imines at room temperature provides a mild selective and high yielding route to α-aminoalkylphosphorate and α-aminoalkylphenylphosphinate esters. Isocyanates and carbodiimides react similarly to give phosphonoureas and phosphonoguarnidines respectively aldehydes and ketones are much less reactive and cyanides are inert.
- Afarinkia, Kamyar,Rees, Charles W.,Cadogan, John I. G.
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p. 7175 - 7196
(2007/10/02)
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- Alkylaminonitrobenzenes by Vicarious Nucleophilic Amination with 4-(Alkylamino)-1,2,4-triazoles
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A series of 4-(alkylamino)-1,2,4-triazoles transfer the alkylamino group to the 4-position of nitrobenzene and various 3-substituted nitrobenzenes, with no detectable ortho substitution.By contrast 2-nitrothiophene reacts in the 3-position and 2-nitronaphthalene in the 1-position; 1-nitronaphthalene gives a mixture of products derived from dominant 2- with some 4-substitution.The orientations are discussed and rationalized.
- Katritzky, Alan R.,Laurenzo, Kathleen S.
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p. 3978 - 3982
(2007/10/02)
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- REACTION OF SCHIFF BASES OBTAINED FROM 4-AMINOANTIPYRINE AND 4-AMINO-1,2,4-TRIAZOLE WITH KETONES
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With acetophenone and p-nitroacetophenone in alcohol and benzene media in the presence of acid N-arylidene-4-aminoantipyrines form α,β-unsaturated ketones, and with antipyrine the form aryldiantipyrylmethanes.With the same ketones N-arylidene-4-amino-1,2,4-triazoles form the products from addition at the azomethine bond.In both cases reaction with benzylideneacetone was not detected.
- Letunov, V. I.
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p. 145 - 149
(2007/10/02)
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