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- W1983251204 abstract "Abstract The preparation, X‐ray crystallography and magnetic investigation of the compounds PPh 4 [Cr(bipy)(CN) 4 ] ⋅ 2 CH 3 CN ⋅ H 2 O ( 1 ) (mononuclear), [{Cr(bipy)(CN) 4 } 2 Mn(H 2 O) 4 ] ⋅ 4 H 2 O ( 2 ) (trinuclear), [{Cr(bipy)(CN) 4 } 2 Mn(H 2 O) 2 ] ( 3 ) (chain) and [{Cr(bipy)(CN) 4 } 2 Mn(H 2 O)] ⋅ H 2 O ⋅ CH 3 CN ( 4 ) (double chain) [bipy=2,2′‐bipyridine; PPh 4 + =tetraphenylphosphonium] are described herein. The [Cr(bipy)(CN) 4 ] − unit act either as a monodentate ( 2 ) or bis‐monodentate ( 3 ) ligand toward the manganese atom through one ( 2 ) or two ( 3 ) of its four cyanide groups. The manganese atom is six‐coordinate with two ( 2 ) or four ( 3 ) cyanide nitrogens and four ( 2 ) or two ( 3 ) water molecules building a distorted octahedral environment. In 4 , two chains of 3 are pillared through interchain Mn‐N‐C‐Cr links which replace one of the two trans ‐coordinated water molecules at the manganese atom to afford a double chain structure where bis‐ and tris‐monodenate coordination modes of [Cr(bipy)(CN) 4 ] − coexist. The magnetic properties of 1 – 4 were investigated in the temperature range 1.9–300 K. A Curie law behaviour for a magnetically isolated spin quartet is observed for 1 . A significant antiferromagnetic interaction between Cr III and Mn II through the single cyanide bridge [ J =−6.2 cm −1 , the Hamiltonian being defined as Ĥ =− J ( Ŝ Cr(1) ⋅ Ŝ Mn + Ŝ Cr(2) ⋅ Ŝ Mn )] occurs in 2 leading to a low‐lying spin doublet which is fully populated at T <5 K. A metamagnetic behaviour is observed for 3 and 4 [the values of the critical field H c being ca. 3000 ( 3 ) and 1500 Oe ( 4 )] which is associated to the occurrence of weak interchain antiferromagnetic interactions between ferrimagnetic ${{rm Cr}{{{rm III}hfill atop 2hfill}}}$ Mn II chains. The analysis of the exchange pathways in 2 – 4 through DFT type calculations together with the magnetic bevaviour simulation using the quantum Monte Carlo methodology provided a good understanding of their magnetic properties." @default.
- W1983251204 created "2016-06-24" @default.
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- W1983251204 date "2004-11-18" @default.
- W1983251204 modified "2023-10-17" @default.
- W1983251204 title "Nuclearity Controlled Cyanide-Bridged Bimetallic Cr<sup>III</sup>-Mn<sup>II</sup>Compounds: Synthesis, Crystal Structures, Magnetic Properties and Theoretical Calculations" @default.
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