Carlos Vazquez

Decamethylchromocenium tetracyanoethenide, (Cr(C5Me5)2]:.+[TCNE]˙+: a molecular ferromagnet with Tc= 3.65 K

The electron-transfer salt 4[Cr(C5Me5)2]+[TCNE]˙–(TCNE = tetracyanoethylene) has been prepared and structurally characterized by single-crystal X-ray diffraction. It possesses a solid-state motif of parallel 1D chains of alternating radical rations and anions similar to, but not isostructural to, the ferromagnet [Fe(C5Me5)2]˙+[TCNE]˙–·4[Cr(C5Me5)2]+[TCNE]˙– is a soft ferromagnet with no hysteretic effects observed and Tc= 3.65 K.

Magnetic behaviour of octaethylporphyrinatomanganese(III) tetracyanoethenide, [MnOEP][TCNE], and hexacyanobutadienide, [MnOEP][C4(CN)6]: the importance of a uniform chain for stabilizing strong effective ferromagnetic coupling

[MnOEP][A]{A=[TCNE]˙– and [C4(CN)6]˙–} have been isolated as extended 1D coordination polymers with trans-µ2-[A] bridging ligands with strong {A=[C4(CN)6]˙–} and weak {A =[TCNE]˙–} ferromagnetic coupling as evidenced from the fit of the magnetic susceptibility to the Curie-Weiss law (θ= 5.1 and 67.1 K, respectively); the strong behaviour arises from the presence of uniform chains which are not present for the [TCNE]˙– salt.

Novel co-operative magnetic properties of decamethylmanganocenium 2,3-dichloro-5,6-dicyanobenzoquinoneide, 3[Mn(C5Me5)2]:+[DDQ]˙–

The electron-transfer salt 3[Mn(C5Me5)2]:+[DDQ]˙–, isomorphous to orthorhombic [Fe(C5Me5)2]˙+[DDQ]˙–, has been prepared. It exhibits a complex field-dependent magnetic pahse diagram at low temperatures with evidence for ferromagnetic coupling as well as a low moment state below 4 K for zero-field cooled samples.

Structure and physical properties of hexacyanomanganate(iv),[MnIV(CN)6]2-

Hydrolytically unstable d n 3 n n[Mn n IV n(CN) n 6 n] n 2- n as the n[N(PPh n 3 n) n 2 n] n + n salt is crystallographically, nspectroscopically, and magnetically characterized.