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• W2019413807 abstract "The crystal structures of the 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane, TCNQF4, electron transfer salts of meso-tetraphenylporphinatomagnesium(II), [MgTPP][TCNQF4]·PhMe and [MgTPP][TCNQF4]·3(1,2-C6H4Cl2), and meso-tetrakis(3,4,5-trimethoxyphenyl)porphinatomagnesium(II), [MgT(3,4,5-OMe)PP][TCNQF4]·3(1,2-C6H4Cl2), provide the first structurally characterized examples of 1-D metal−radical chains involving [MgII(porphyrin•)]+. These salts possess [TCNQF4]•- stabilized by trans-μ-coordination to Mg(II) and exhibit νCN at 2199 and 2177, 2212 and 2187, and 2194 and 2172 cm-1, respectively. The [TCNQF4]•- species is planar and bridges two cations with MgN distances of 2.266(16), 2.221(2), and 2.276(3) Å, respectively, which are shorter than the MnN 2.321(3) Å distance observed for [MnT(3,4,5-OMe)PP][TCNQF4]·3(1,2-C6H4Cl2). The room-temperature effective moments for [MgTPP][TCNQF4]·xS (S = PhMe and 1,2-C6H4Cl2) and [MgTPP][C4(CN)6]·PhMe are consistent with the calculated spin only value of 2.45 μB with weak antiferromagnetic coupling (Jintra/kB ∼ −2.9 K; H = −2JSa·Sb) for these [TCNQF4]•- salts and for this [C4(CN)6]•- salt (Jintra/kB ∼ −0.8 K) on the basis of fits to several models. The coupling is significantly reduced with respect to that of the Mn analogues due to lack of spin on the metal site for [MgII(por•)]+. The antiferromagnetic coupling is enhanced for [MgT(3,4,5-OMe)PP][TCNQF4] with respect to [MgTPP][TCNQF4] as [TCNQF4]•- gets closer to the [MgII(por•)]+ plane, which leads to greater interactions and coupling." @default.
• W2019413807 created "2016-06-24" @default.
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• W2019413807 date "2003-03-05" @default.
• W2019413807 modified "2023-10-18" @default.
• W2019413807 title "Structure and Magnetic Properties of Tetraarylporphinatomagnesium(II) Electron Transfer Salts of 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane, TCNQF₄" @default.
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• W2019413807 doi "https://doi.org/10.1021/ic020494w" @default.
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