0000000001304888
AUTHOR
Amit Rajput
[CuII{(LISQ)˙−}2] (H2L: thioether-appended o-aminophenol ligand) monocation triggers change in donor site from N2O2 to N2O(2)S and valence-tautomerism
Using a potentially tridentate o-aminophenol-based redox-active ligand H2L1 (2-[2-(benzylthio)phenylamino]-4,6-di-tert-butylphenol) in its deprotonated form, [Cu(L1)2] has been synthesized and crystallized as [CuII(L1)2]·CH2Cl2 (1·CH2Cl2). A cyclic voltammetry experiment (in CH2Cl2; V vs. SCE (saturated calomel electrode)) on 1·CH2Cl2 exhibits two oxidative (E = 0.20 V (peak-to-peak separation, ΔEp = 100 mV) and E = 0.90 V (ΔEp = 140 mV)) and two reductive (E = -0.52 V (ΔEp = 110 mV) and E = -0.92 V (ΔEp = 120 mV)) responses. Upon oxidation using a stoichiometric amount of [FeIII(η5-C5H5)2](PF6), 1·CH2Cl2 yielded [Cu(L1)2](PF6) (2). Structural analysis (100 K) reveals that 1·CH2Cl2 is a fou…
Six-coordinate [CoIII(L)2]z (z = 1−, 0, 1+) complexes of an azo-appended o-aminophenolate in amidate(2−) and iminosemiquinonate π-radical (1−) redox-levels: the existence of valence-tautomerism
Aerobic reaction of the ligand H2L1, 2-(2-phenylazo)-anilino-4,6-di-tert-butylphenol, CoCl2·6H2O and Et3N in MeOH under refluxing conditions produces, after work-up and recrystallization, black crystals of [Co(L1)2] (1). When examined by cyclic voltammetry, 1 displays in CH2Cl2 three one-electron redox responses: two oxidative, E11/2 = 0.30 V (peak-to-peak separation, ΔEp = 100 mV) and E21/2 = 1.04 V (ΔEp = 120 mV), and one reductive E1/2 = −0.27 V (ΔEp = 120 mV) vs. SCE. Consequently, 1 is chemically oxidized by 1 equiv. of [FeIII(η5-C5H5)2][PF6], affording the isolation of deep purple crystals of [Co(L1)2][PF6]·2CH2Cl2 (2), and one-electron reduction with [CoII(η5-C5H5)2] yielded bluish-b…
Discrete unusual mixed-bridged trinuclear CoIII2CoII and pentanuclear NiII coordination complexes supported by a phenolate-based ligand: theoretical and experimental magneto-structural study
Two new complexes [CoIII2CoII(μ-OL)2(μ-OOCCH3)2(μ-N3)2(N3)2]·Et2O (1·Et2O) and [NiII5(μ-OL)4(μ-OOCCH3)2(OOCCH3)2(μ-N3)2]·CH3CN (2) (HOL = 2-((2-(pyridin-2-yl)ethylamino)methyl)phenol) have been synthesized and characterized by elemental analysis, IR, and UV/Vis spectroscopy. Structural analysis revealed that 1 is a discrete trinuclear and 2 is a discrete pentanuclear coordination complex. In complex 1, terminal metal (CoIII) is in a distorted octahedral MN4O2 environment where coordination is satisfied by two nitrogen atoms and one oxygen atom of the ligand, and an oxygen atom from the acetate group and two nitrogen atoms from azide (one each from the bridging and terminal ones). The centra…
CCDC 1567091: Experimental Crystal Structure Determination
Related Article: Amit Rajput, Anuj Kumar Sharma, Suman K. Barman, Francesc Lloret, Rabindranath Mukherjee|2018|Dalton Trans.|47|17086|doi:10.1039/C8DT03257B
CCDC 1866837: Experimental Crystal Structure Determination
Related Article: Amit Rajput, Anannya Saha, Suman K. Barman, Francesc Lloret, Rabindranath Mukherjee|2019|Dalton Trans.|48|1795|doi:10.1039/C8DT03778G
CCDC 2046943: Experimental Crystal Structure Determination
Related Article: Richa, Muni Rathnam, Akhilesh Kumar, Indresh Verma, Julia Kłak, Joan Cano, Antonio J. Mota, Amit Rajput, Himanshu Arora|2021|New J.Chem.|45|6053|doi:10.1039/D1NJ00228G
CCDC 1866835: Experimental Crystal Structure Determination
Related Article: Amit Rajput, Anannya Saha, Suman K. Barman, Francesc Lloret, Rabindranath Mukherjee|2019|Dalton Trans.|48|1795|doi:10.1039/C8DT03778G
CCDC 2046942: Experimental Crystal Structure Determination
Related Article: Richa, Muni Rathnam, Akhilesh Kumar, Indresh Verma, Julia Kłak, Joan Cano, Antonio J. Mota, Amit Rajput, Himanshu Arora|2021|New J.Chem.|45|6053|doi:10.1039/D1NJ00228G
CCDC 1866836: Experimental Crystal Structure Determination
Related Article: Amit Rajput, Anannya Saha, Suman K. Barman, Francesc Lloret, Rabindranath Mukherjee|2019|Dalton Trans.|48|1795|doi:10.1039/C8DT03778G
CCDC 1567090: Experimental Crystal Structure Determination
Related Article: Amit Rajput, Anuj Kumar Sharma, Suman K. Barman, Francesc Lloret, Rabindranath Mukherjee|2018|Dalton Trans.|47|17086|doi:10.1039/C8DT03257B
CCDC 1567092: Experimental Crystal Structure Determination
Related Article: Amit Rajput, Anuj Kumar Sharma, Suman K. Barman, Francesc Lloret, Rabindranath Mukherjee|2018|Dalton Trans.|47|17086|doi:10.1039/C8DT03257B