The crystal structure of the solvated complex Mn2(CO)5(dpm)2,CH2Cl3,C6H14 (where dpm = Ph2PCH2PPh2) has been determined by three-dimensional X-ray diffraction methods. The crystals are monoclinic, of space group Cc, with a 19.650(3), b 16.908(2), c 22.253(4) Ǻ and β 130.89(1)�, containing four molecules per unit cell. The structure, solved by conventional Patterson and Fourier methods, was refined by a least- squares method, using individual isotropic temperature factors, to R and Rw of 0.105 and 0.125 respectively, for 1893 independent statistically significant reflections collected by counter methods. The crystals are molecular, being composed of discrete molecules of complex and solvent. The principal feature of interest in the binuclear manganese complex is the presence of a carbonyl ligand simultaneously bonded to both manganese atoms in a manner quite different from the normal symmetrical bridging mode. This novel arrangement, which seems to involve a metal-carbonyl bond analogous to that found for many metal-olefin complexes, accounts for the anomalously low carbonyl stretching frequency observed at 1645 cm-1. The Mn-Mn distance is 2.934(6) Ǻ.

The reactions of manganese carbonyl with the ditertiary phosphorus ligand bis(dipheny1phosphino)-methane, dpm, and its arsenic analogue, dam, have been investigated. The major products are of the types Mn2(CO),(L-L), [(L-L) = dpm or dam], Mnz(C0)6(dpm)z and Mn,(CO)s(dpm)2.Mn,(C0)5(dpm), displays a carbonyl stretch at the extremely low frequency of 1645 cm-l. It has been shown that the molecule contains a carbonyl group bridging between the manganese atoms in a previously unknown manner.

A 2-D coordination framework, (NEt4)2[Fe2(fan)3] (1·5­(acetone); H2fan = 3,6-difluoro-2,5-dihydroxy-1,4-benzoquinone), was synthesized and structurally characterized. The compound is structurally analogous to a formerly elucidated framework, (NEt4)2[Fe2(can)3] (H2can = 3,6-dichloro-2,5-dihydroxy-1,4-benzoquinone), and adopts a 2-D (6,3) topology with the symmetrical stacking of [Fe2(fan)3]2– sheets that are held in position by the NEt4 + cations between the sheets. The investigation of the dc and ac magnetic properties of 1·5­(acetone) revealed ferromagnetic ordering behavior and slow magnetization relaxation, as evinced from ac susceptibility measurements. Furthermore, the exposure of 1·5­(acetone) to air led to the formation of a heptahydrate 1·7H 2 O which displayed distinct magnetic properties. The study of the redox state and extent of delocalization in 1·5­(acetone) was undertaken via crystallography, in combination with Mössbauer and vis–NIR spectroscopy, to reveal the mixed-valence and delocalized nature of the as-synthesized material. As a result, the conductivity studies conducted on a pressed pellet showed a relatively high conductivity of 1.8 × 10–2 S cm–1 (300 K). In order to compare structurally related anilate-based structures, a relationship among the redox state, spectroscopic properties, and electronic properties was elucidated in this work. A preliminary investigation of 1·5­(acetone) as a candidate anode material in lithium ion batteries revealed a high reversible capacity of 676.6 mAh g–1 and high capacity retention.

The i.r. spectrum of the dimeric manganese(0) carbonyl complex ~n,(CO),(Ph,PCH,PPh,),] exhibits an unusually low carbonyl stretching frequency which a crystal structure determination has revealed to be caused by a carbonyl ligand bonded in a novel bridging manner.REACTION of [Mn,(CO),,] with Ph,PCH,PPh, (mdpp) (2 mol. equiv.) in n-decane under nitrogen yields the red diamagnetic complex [Mn,(CO),(mdpp),]. Its solid-state i.r. spectrum contains four strong bands between 2000 and 1800

The combination of 4-hydroxbenzoic acid with metal ions Li+, Mg2+ and Cu2+ leads to the formation of novel 2D and 3D networks.