Roles of basicity and steric crowding of anionic coligands in catechol oxidase-like activity of Cu(<scp>ii</scp>)–Mn(<scp>ii</scp>) complexes

Dutta, Sabarni; Bhunia, Pradip; Mayans, Júlia; Drew, Michael G. B.; Ghosh, Ashutosh

doi:10.1039/d0dt00952k

Cited by 29 publications

(13 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values indicate an antiferromagnetic interaction between the Cu II and Mn II cations with a magnitude similar to those of previously reported Cu II /Mn II dinuclear complexes with related Schiff bases, 9 and for complex 3, ferromagnetic coupling mediated by the end-on azido bridges 10 between the Mn II cations, resulted in well isolated ground spin states of S = 3/2 for 1, S = 2 for 2 and S = 4 for 3 with a gap of 83, 91 and 22 cm −1 , respectively, to the first S = 3 excited state. In agreement with these data, the magnetization values under the maximum applied field are 3.37Nμ β for 1 (S = 3/2), 5.88Nμ β for 2 (S = 2 for the dimeric entity plus two isolated Cu II cations) or 10.45Nμ β for 3 (S = 4 for the tetranuclear entity plus two isolated Cu II cations).…”

Section: Communicationsupporting

confidence: 89%

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear Cu^II/Mn^IIcomplexes

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Communicationsupporting

confidence: 89%

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear Cu^II/Mn^IIcomplexes

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The activity of complex 3 , although less than that of 1 , still is significantly high in comparison to the other reported complexes. The presence of a carboxylate group as a coligand in the complex seems to be responsible for this, as was also found earlier . The greater efficiency of these heterometallic complexes is generally ascribed to the cooperative action of the two different metal ions.…”

Section: Resultssupporting

confidence: 72%

“…The catechol oxidase and phenoxazinone synthase activities of 1 and 3 in 1/1 (v/v) ACN/MeOH solution were investigated as reported previously by us. , The generation of H 2 O 2 in the process was ascertained by the iodometric method. − …”

Section: Experimental Sectionmentioning

confidence: 99%

Joining of Trinuclear Heterometallic Cu^II₂–M^II (M = Mn, Cd) Nodes by Nicotinate to Form 1D Chains: Magnetic Properties and Catalytic Activities

et al. 2020

Self Cite

View full text Add to dashboard Cite

In the present work, four new heterometallic coordination complexes, {[(CuL) 2 Mn(nic and [(CuL) 2 Cd(nic) 2 ]•2CH 3 OH (4) (where H 2 L = N,N′-bis(α-methylsalicylidene)-1,3-propanediamine and nic = nicotinate ion), have been synthesized and characterized by single-crystal X-ray crystallography. In complexes 1 and 2, the nicotinate ion acts as a bifunctional linker (N,O donor) and joins the linear trinuclear nodes to form 1D polymeric chains. However, in complexes 3 and 4, the nicotinate ion uses only the oxygen atoms of the carboxylic acid (O donor) to bind to the metal centers, forming discrete linear trinuclear units, while the pyridyl nitrogen (N donor atom) remains free. The dc magnetic susceptibility measurements show that the Cu II and Mn II ions are antiferromagnetically coupled in both 1 and 3, with exchange coupling constants (J Mn−Cu ) of −20.57 ± 0.08 and −9.38 ± 0.08 cm −1 , respectively. Among the four complexes, 1 and 3 show catechol oxidase and phenoxazinone synthase like catalytic activities. The turnover numbers (k cat ) of complexes 1 and 3 for catecholase activity are 1121 and 720 h −1 , respectively, at an optimum pH of 8.0 and for phenoxazinone synthase activity are 429 and 398 h −1 , respectively, at an optimum pH of 9.7. The higher k cat values of 1 for both reactions are attributable to a water molecule coordinated to the central Mn II atom that facilitates the substrate−catalyst binding. An ESI-mass spectral analysis indicates that trinuclear heterometallic species, e.g., [(CuL) 2 Mn(nic)(H 2 O)] + for 1 and [(CuL) 2 Mn-(nic)] + for 3, are the active species that bind to the substrate, and on that basis, probable mechanisms through the formation of radical intermediates have been proposed.

show abstract

“…Therefore, designing of suitable coordination compounds for imitating the active sites of bio-relevant metalloenzymes like catechol oxidase has fascinated huge devotion over the years. [27][28][29] Herein, we have synthesized a novel Cu(II) based paddle-wheel compound [Cu 2 (nac) 4 (4-nvp) 2 ] (1) (Hnac=3-(1naphthyl)acrylic acid and 4-nvp=4-(1-naphthylvinyl)pyridine), which possesses the above mentioned properties for multipurpose applications. The compound shows electrical conductivity in the semiconducting regime that exhibits non-linear behavior with good rectification and can be used as Schottky barrier diode.…”

Section: Introductionmentioning

confidence: 99%

Exploitation of Structure‐Property Relationships towards Multi‐Dimensional Applications of a Paddle‐Wheel Cu(II) Compound

et al. 2022

View full text Add to dashboard Cite

Dedicated to Professor Chittaranjan Sinha on the occasion of his 61st birthdayThe systematic understanding of structure-property correlations of coordination compounds can be utilized for their potential applications. To rationalize this concept, a mixed ligand based Cu(II) compound [Cu 2 (nac) 4 (4-nvp) 2 ](1) (Hnac = 3-(1naphthyl)acrylic acid and 4-nvp = 4-(1-naphthylvinyl)pyridine) has been synthesized and single crystal is obtained by the simple layering technique. Compound 1 has fascinating paddle wheel structure which undergoes weak CÀ H•••π interactions to generate a three-dimensional (3D) supramolecular aggregate. An electrical analysis, i. e. current-voltage (I-V) measurement of this material, exhibited rectifying behavior in the forward bias, which affirms the formation of a Schottky diode. Impedance spectroscopy (IS) analysis has also been performed to get insight into the diode application. Besides, the fluorescence emission of 1 is quenched by 2,4,6-trinitrophenol (TNP) and 2,4dinitrophenol (DNP), among other nitroaromatics, and the maximum quenching efficiency is observed for TNP (98 %). The limits of detection (LOD) are determined by following 3σ methods and are found to be 0.77 μM (TNP), and 0.85 μM (DNP). Interestingly, compound 1 also exhibits biomimetic catechol oxidase-like activity for the oxidation of catechol to quinone. Therefore, the synthesized compound can be considered as a promising candidate for multi-functional applications in material science.

show abstract

Roles of basicity and steric crowding of anionic coligands in catechol oxidase-like activity of Cu(ii)–Mn(ii) complexes

Cited by 29 publications

References 82 publications

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear Cu^II/Mn^IIcomplexes

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear Cu^II/Mn^IIcomplexes

Joining of Trinuclear Heterometallic Cu^II₂–M^II (M = Mn, Cd) Nodes by Nicotinate to Form 1D Chains: Magnetic Properties and Catalytic Activities

Exploitation of Structure‐Property Relationships towards Multi‐Dimensional Applications of a Paddle‐Wheel Cu(II) Compound

Contact Info

Product

Resources

About

Roles of basicity and steric crowding of anionic coligands in catechol oxidase-like activity of Cu(ii)–Mn(ii) complexes

Cited by 29 publications

References 82 publications

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear CuII/MnIIcomplexes

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear CuII/MnIIcomplexes

Joining of Trinuclear Heterometallic CuII2–MII (M = Mn, Cd) Nodes by Nicotinate to Form 1D Chains: Magnetic Properties and Catalytic Activities

Exploitation of Structure‐Property Relationships towards Multi‐Dimensional Applications of a Paddle‐Wheel Cu(II) Compound

Contact Info

Product

Resources

About

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear Cu^II/Mn^IIcomplexes

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear Cu^II/Mn^IIcomplexes

Joining of Trinuclear Heterometallic Cu^II₂–M^II (M = Mn, Cd) Nodes by Nicotinate to Form 1D Chains: Magnetic Properties and Catalytic Activities