CRYSTAL AND MOLECULAR-STRUCTURE OF (OCTAETHYLPORPHINATO)COBALT(II) - COMPARISON OF THE STRUCTURES OF 4-COORDINATE M(TPP) AND M(OEP) DERIVATIVES (M=FE-CU) - USE OF AREA DETECTOR DATA

The crystal and molecular structure of four-coordinate (octaethylporph inato)cobalt(II) has been determined at 127 K from X-ray diffraction d ata collected on an area detector. Crystals of Co(OEP) are isomorphous with Fe(OEP), one crystalline form of Ni(OEP), and Cu(OEP); the porph inato cores in the series are all planar. The M-N(p) bond distance ord er in the series is Fe > Co > Ni < Cu. The isomorphous M(OEP) derivati ves form similar extended pi-pi aggregates with no metal atom dependen ce on the intermolecular geometry. A comparison of the analogous, isom orphous series of tetraphenylporphyrin compounds, which have significa ntly ruffled cores, is given. The average value of the Co-N(p) bond di stance in Co(OEP) is 1.971 (6). Crystal data: C36H44N4Co, a = 13.046(1 5) angstrom, b = 13.217(12) angstrom, c = 4.742(7) angstrom, alpha = 9 0.60(6)degrees, beta = 92.56(2)degrees, gamma = 113.53(2)degrees, tric linic, space group P1BAR, V= 748.5 angstrom3, Z = 1, 2640 unique obser ved data, final data/variable = 14.1, R1 = 0.039, R2 = 0.044, all obse rvations at 127 K.