Ionic and Neutral C60 Complexes with Coordination Assemblies of Metal Tetraphenylporphyrins, MIITPP2·DMP (M = Mn, Zn). Coexistence of (C60-)2 Dimers Bonded by One and Two Single Bonds in the Same Compound

Crystal structure of an unknown solvate of (piperazine-κN){5,10,15,20-tetra-kis-[4-(benzo-yloxy)phen-yl]porphyrinato-κ(4) N}zinc

The title compound, [Zn(C72H44N4O8)(C4H10N2)] or [Zn(TPBP)(pipz] (where TPBP and pipz are 5,10,15,20-tetra-kis-[4-(benzo-yloxy)phen-yl]porphyrinato and piperazine ligands respectively), features a distorted square-pyramidal coordin-ation geometry about the central Zn(II) atom. This central atom is chelated by the four N atoms of the porphyrinate anion and further coordinated by a nitro-gen atom of the piperazine axial ligand, which adopts a chair confirmation. The average Zn-N(pyrrole) bond length is 2.078 (7) Å and the Zn- N(pipz) bond length is 2.1274 (19) Å. The zinc cation is displaced by 0.4365 (4) Å from the N4C20 mean plane of the porphyrinate anion toward the piperazine axial ligand. This porphyrinate macrocycle exhibits major saddle and moderate ruffling deformations. In the crystal, the supra-molecular structure is made by parallel pairs of layers along (100), with an inter-layer distance of 4.100 Å while the distance between two pairs of layers is 4.047 Å. A region of electron density was treated with the SQUEEZE [Spek (2015 ▸). Acta Cryst. C71, 9-18] procedure in PLATON following unsuccessful attempts to model it as being part of disordered n-hexane solvent and water mol-ecules. The given chemical formula and other crystal data do not take into account these solvent mol-ecules.

The molecular structure of high-spin (S = 5/2) manganese(II) phthalocyanine in tetrabutylammonium bromido(phthalocyaninato)manganese(II)

The title complex salt, (C16H36N)[MnBr(C32H16N8)] or (TBA)[Mn(II)Br(Pc)] (TBA is tetrabutylammonium and Pc is phthalocyaninate), has been obtained as single crystals by the diffusion technique and its crystal structure was determined using X-ray diffraction. The high-spin (S = 5/2) [Mn(II)Br(Pc)](-) macrocycle has a concave conformation, with an average equatorial Mn-N(Pc) bond length of 2.1187 (19) Å, an axial Mn-Br bond length of 2.5493 (7) Å and with the Mn(II) cation displaced out of the 24-atom Pc plane by 0.894 (2) Å. The geometry of the Mn(II)N4 fragment in [Mn(II)Br(Pc)](-) is similar to that of the high-spin (S = 5/2) manganese(II) tetraphenylporphyrin (TPP) in [Mn(II)(1-MeIm)(TPP)] (1-MeIm is 1-methylimidazole).

Structure and optical properties of fullerene C60 complex with dipyridinated iron(II) phthalocyanine [Fe(II)Pc(C5H5N)2]·C60·4C6H4Cl2: First structure of bisaxially coordinated iron(II) phthalocyanine complex with acetonitrile Fe(II)Pc(CH3CN)2

The complex of fullerene C 60 with dipyridinated iron(II) phthalocyanine [ Fe ( II ) Pc ( C 5 H 5 N )2]· C 60·4 C 6 H 4 Cl 2 (1) has been obtained as single crystals. According to the IR- and UV-visible-NIR spectra, 1 is molecular solid with no charge transfer from Fe ( II ) Pc ( C 5 H 5 N )2 to C 60· C 60 molecules form closely packed linear columns in 1 along the b axis with a uniform interfullerene center-to center distance of 9.99 Å and multiple short van der Waals (vdW) C … C contacts between fullerenes of 3.10–3.18 Å. Totally each Fe ( II ) Pc ( C 5 H 5 N )2 unit is surrounded by four C 60 molecules two of which form short vdW C … C contacts with the phthalocyanine plane locating near two adjacent phenylene substituents of Fe ( II ) Pc . The Fe ( II ) Pc ( C 5 H 5 N )2 geometry remains almost unchanged as compared with that of fullerene free Fe ( II ) Pc ( C 5 H 5 N )2. The iron(II) atoms are located exactly in the Pc plane, the Fe - N ( C 5 H 5 N ) bond length is 2.038(3) Å and the averaged of the Fe - N ( Pc ) bond length is 1.935(3) Å. Bisaxially coordinated iron(II) phthalocyanine complex with acetonitrile Fe ( II ) Pc ( CH 3 CN )2 does not cocrystallize with C 60. Nevertheless, good quality crystals of [ Fe ( II ) Pc ( CH 3 CN )2]·2 C 6 H 4 Cl 2 (2) were isolated in this synthesis. That is the first structure of bisaxially coordinated metal phthalocyanine complex with nitrile containing solvent. Acetonitrile unusually strongly coordinates to Fe ( II ) Pc with the Fe – N ( CH 3 CN ) bond length of 1.938(1) Å. The iron(II) atoms are located in the Pc plane and the averaged length of the Fe - N ( Pc ) bonds is 1.934(1) Å.

Transition from free rotation of C70 molecules to static disorder in the molecular C70 complex with covalently linked porphyrin dimers: {(FeIIITPP)2O}·C70

Fullerene C 70 and covalently linked porphyrin ( Fe III TPP )2 O dimers (TPP: tetraphenylporphyrin) form molecular complex {( Fe III TPP )2 O }· C 70 (1). Each C 70 molecule is sandwiched between two ( Fe III TPP )2 O dimers and is surrounded by phenyl groups of four other porphyrin dimers. At 295 K, C 70 molecules freely rotate about the short axis of the molecule in the ab plane. As a result, the disordered C 70 molecules form spheroids flattened at the poles. The rotation of C 70 stops near 100 K, resulting in the transition from a tetragonal to a monoclinic unit cell with a four-fold increase in the unit cell volume. In monoclinic phase the C 70 molecules are located on the axis which coincides with the short axis of the molecule and passes through the midpoints of two oppositely located 6-6 bonds. Since this position has higher symmetry than the own symmetry of C 70, it results in statistic disorder of the C 70 molecules between two orientations. It was shown that multiple Van der Waals contacts with a concave Fe III TPP macrocycle which appear below 100 K, play an important role in the ordering of C 70.

Frontiers of organic conductors and superconductors

We review the development of conductive organic molecular assemblies including organic metals, superconductors, single component conductors, conductive films, conductors with a switching function, and new spin state (quantum spin liquid state). We emphasize the importance of the ionicity phase diagram for a variety of charge transfer systems to provide a strategy for the development of functional organic solids (Mott insulator, semiconductor, superconductor, metal, complex isomer, neutral-ionic system, alignment of chemical potentials, etc.). For organic (super)conductors, the electronic dimensionality of the solids is a key parameter and can be designed based on the self-aggregation ability of a molecule. We present characteristic structural and physical properties of organic superconductors.