T-Site Selective Photocleavage of DNA by Cationic Schiff Base Complex of Manganese(III)

Sakamoto, Fuminori; Sumiya, Tomoyuki; Fujita, Masaaki; Tada, Toshiji; Tan, Xinsheng; Suzuki, Eiji; Okura, Ichiro; Fujii, Yuki

doi:10.1246/cl.1998.1127

Cited by 20 publications

(10 citation statements)

References 11 publications

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“…All of the reagents and solvents (EKOS-1, Moscow, Russia) were used without further purification; [Mn(SB 2+ )(H 2 O) 2 ](ClO 4 ) 3 ·H 2 O [ 40 ] and (Bu 4 N) 3 [Re(CN) 7 ] [ 36 ] were prepared using published protocols.…”

Section: Methodsmentioning

confidence: 99%

Very Anisotropic 2D Molecular Magnetic Materials Based on Pentagonal Bipyramidal Heptacyanidorhenate(IV)

2022

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The first neutral 2D heterometallic assemblies based on orbitally degenerate heptacyanidorhenate(IV) were prepared and structurally characterized. An analysis of the magnetic data for the polycrystalline samples of Ph4P[{Mn(acacen)}2Re(CN)7]·Solv (1) and PPN[{Mn(acacen)}2Re(CN)7]·Solv (2) have shown that both materials display slow magnetic relaxation at temperatures below 10 and 21 K for 1 and 2, respectively. Despite the presence of the same molecular magnetic modules that make up the anionic layers, the studied 2D networks differ significantly in magnetic anisotropy, having a small coercive field (0.115 T) for 1 and a large one (~2.5 T) for 2 at 2 K. In addition, for both polymers a M(H) value does not saturate at the maximum available field of 7 T, and the material 2 is a metamagnet. This intriguing difference originates from the cooperative anisotropic spin interaction in ReIV−CN−MnIII pairs and the zero field splitting (ZFS) effect of MnIII ions with a noncollinear alignment of the local magnetic axes in crystals of the compounds.

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Section: Methodsmentioning

confidence: 99%

Very Anisotropic 2D Molecular Magnetic Materials Based on Pentagonal Bipyramidal Heptacyanidorhenate(IV)

2022

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“…Synthesis of [Mn(5‐TMAMsaltmen)(H 2 O) 2 ](ClO 4 ) 3 ⋅H 2 O : [Mn(5‐TMAMsaltmen)(H 2 O) 2 ](ClO 4 ) 3 ⋅ H 2 O as a precursor for compound 1 was synthesized by using the literature method 37. Mn(CH 3 CO 2 ) 3 ⋅ 2 H 2 O (0.912 g, 3.40 mmol) was added to a solution containing 5‐(trimethylammoniummethyl)salicylaldehyde chloride (1.362 g, 6.80 mmol) and NaOH (0.08 g, 2.00 mmol) in water (50 mL).…”

Section: Methodsmentioning

confidence: 99%

Single‐Chain Magnet Behavior in an Alternated One‐Dimensional Assembly of a Mn^III Schiff‐Base Complex and a TCNQ Radical

Miyasaka¹,

Madanbashi²,

Sugimoto³

et al. 2006

Chemistry A European J

171

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An alternated 1:1 chain compound of a Mn(III) salen derivative and the TCNQ monoradical was synthesized: [Mn(5-TMAMsaltmen)(TCNQ)](ClO(4))(2) (1) (TCNQ=tetracyano-p-quinodimethane; 5-TMAMsaltmen=N,N'-(1,1,2,2-tetramethylethylene) bis(5-trimethylammoniomethylsalicylideneiminato)). Compound 1 has a zigzag chain structure packed with adjacent chains with an interchain MnMn distance of over 8 Angatrom. As compound 1 contains no crystallization solvent, the void spaces between chains are occupied only by ClO(4) (-) counter ions. Compound 1 has a structure reminiscent of what has been observed in the family of Mn(III)(porphyrin)-TCNE or -TCNQ compounds reported previously by Miller and co-workers and we demonstrate herein its unique single-chain magnet behavior among this family of compounds. The direct current (dc) magnetic measurements established the one-dimensional nature of compound 1 with an antiferromagnetic exchange coupling, J/k(B) approximately -96 K, between the Mn(III) ion and TCNQ radical and with an activated correlation length (Delta(xi)=26.5 K) at low temperatures (50-15 K). The slow relaxation of the magnetization was shown in compound 1 by the field hysteresis of the magnetization observed below 3.5 K (with a coercive field up to 14 kOe at 1.8 K). Single-crystal magnetization measurements demonstrated the uniaxial symmetry of this compound and allowed an estimation of the anisotropy field, H(a) approximately 97 kOe. The absence of magnetic ordered phase or spin-glass behavior was established by heat-capacity calorimetry measurements that exhibit no abnormality of C(p) between 0.5 K and 10 K. The study of the magnetization relaxation by combined ac (alternating current) and dc techniques showed that compound 1 possesses a single relaxation time (tau). As the consequence of the finite size of the chain, the temperature dependence of tau presents two activated regimes above and below 4.5 K with tau(01)=2.1 x 10(-10) s, Delta(tau1)=94.1 K and tau(02)=6.8 x 10(-8) s and Delta(tau2)=67.7 K, respectively. The detailed analysis of these dynamics properties together with the correlation length, allows an unambiguous demonstration of the single-chain magnet behavior in 1.

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“…[Mn(5-TMAMsalen)(H2O)2](ClO4)3 ·H2O [99] and K3[W(CN)8](H2O)2 [100,101] were prepared using published procedures. Elemental (C, H, N) analyses were carried out by standard methods with a "Euro-Vector 3000" analyzer.…”

Section: General Detailsmentioning

confidence: 99%

Neutral Low-Dimensional Assemblies of a Mn(III) Schiff Base Complex and Octacyanotungstate(V): Synthesis, Characterization and Magnetic Properties

Majcher

Pilet²,

Mironov³

et al. 2017

Preprint

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Two novel low-dimensional molecular magnetic materials were prepared by a self-assembling of 3d-and 5d-metal complexes. These are the first neutral heterobimetallic cyanobridged compounds involving one anisotropic Mn(III) Schiff base complex and one octacyanotungstate(V) per molecular unit. A slow diffusion of the constituents' solutions leads to a formation of the 0D crystalline complex 1 due to coordination of a water molecule to the Mn center prevents a polymer formation. A rapid mixing of reagents results in a precipitation of the microcrystalline powder of the complex 2, which on a totality of experimental data possess 1D polymeric structure. The magnetic studies have shown that antiferromagnetic exchange interactions are dominating in 1 J/kB= -13.1(7) K, D=-3.0(1.3) K, zJ'= -0.16(20) K and gav=2.00(1); while the presence of the significant intramolecular Mn(III)-W(V) ferromagnetic couplings through cyanide bridges is characteristic for 2 (J/kB = 46.1(5) K gMn = 2.11(3), fixed gW = 2.0). Due to the weak interchain interactions, zJ'/kB = -0.8(2) K, compound 2 is a metamagnet with the Néel temperature of 9.5 K undergoing a spin-flip transition at 2 kOe. The slow magnetization dynamics of 2 was investigated at DС field of 0 and 2 kOe, giving the values of τ0 32(15) and 36(15) ps respectively, well within the range typical for SCMs. The respective ∆τ/kB values were 48.4(1.2) and 44.9(1.0) K.

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T-Site Selective Photocleavage of DNA by Cationic Schiff Base Complex of Manganese(III)

Cited by 20 publications

References 11 publications

Very Anisotropic 2D Molecular Magnetic Materials Based on Pentagonal Bipyramidal Heptacyanidorhenate(IV)

Very Anisotropic 2D Molecular Magnetic Materials Based on Pentagonal Bipyramidal Heptacyanidorhenate(IV)

Single‐Chain Magnet Behavior in an Alternated One‐Dimensional Assembly of a Mn^III Schiff‐Base Complex and a TCNQ Radical

Neutral Low-Dimensional Assemblies of a Mn(III) Schiff Base Complex and Octacyanotungstate(V): Synthesis, Characterization and Magnetic Properties

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T-Site Selective Photocleavage of DNA by Cationic Schiff Base Complex of Manganese(III)

Cited by 20 publications

References 11 publications

Very Anisotropic 2D Molecular Magnetic Materials Based on Pentagonal Bipyramidal Heptacyanidorhenate(IV)

Very Anisotropic 2D Molecular Magnetic Materials Based on Pentagonal Bipyramidal Heptacyanidorhenate(IV)

Single‐Chain Magnet Behavior in an Alternated One‐Dimensional Assembly of a MnIII Schiff‐Base Complex and a TCNQ Radical

Neutral Low-Dimensional Assemblies of a Mn(III) Schiff Base Complex and Octacyanotungstate(V): Synthesis, Characterization and Magnetic Properties

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Single‐Chain Magnet Behavior in an Alternated One‐Dimensional Assembly of a Mn^III Schiff‐Base Complex and a TCNQ Radical