Iron(II) and Manganese(II) Phthalocyanines tetrahedrally coordinated Fe. The Mossbauer shift for octahedral Fe2+ appears to be 0.90 mm/s. Knowledge of isomer shifts for the compounds Fe[S2CN(n-Bu)2b and Fe[S2C-N(CH2)4]3, in which iron atoms are in the trivalent oxidation state, would be extremely valuable in order to establish its variation with valence in octahedrally coordinated iron compounds.Acknowledgment. Financial support for this research effort by the National Science Foundation and the Robert A. Welch Foundation, Houston, Tex., is gratefully acknowledged. The comments of Dr. R. D. Shannon have been very helpful in the preparation of this manuscript, and we wish to thank him also for communicating to us his results on Fe2SiS4 and Fe2GeS4 prior to their publication.

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The molecular stereochemistry of two crystalline forms of nitrosyl-a,P,y,6-tetraphenylporphinato(4-methylpiperidine)iron(II) has been determined by x-ray diffraction techniques. One form (I) crystallizes as the chloroform solvate in the orthorhombic system, space group P21212~. The unit cell has a = 17.638 (3), b = 25282 (3), and c = 10.108 (1) A, and Z = 4. The other, unsolvated, form (11) crystallizes in the triclinic system, space group P1. The unit cell has a = 1 1.550 (2), b = 17.236 (3), and c = 10.668 (2) A, a = 87.83 (2), = 105.62 (2), and y = 92.93 ( 2 ) O , and Z = 2. Measurement of diffractedintensities employed a four-circle diffractometer with Mo K a radiation. Both forms have bent FeNO groups and an average equatorial Fe-N bond distance of 2.00 (1) A. Significant differences in the two forms are noted for the Fe-Nb bond length to the sixth ligand, trans to NO, and in u(N0). The Fe-Nb bond length in complex I is 2.328 (IO) A and in complex I1 is 2.463 (7) A and suggest weak interaction of the iron atom with the sixth ligand. These data and the comparable data for Fe(TPP)( 1-MeIm)(NO) are used to note a linear correlation between the Fe-Nb bond distance and u ( N 0 ) .

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