33 research outputs found
Structure and Conformation of Photosynthetic Pigments and Related Compounds, 8 [1]: Molecular Structure of an Iron(III) Chlorophyll Derivative - Chloro(phytochlorinato methyl ester)iron(III)
No full textSynthesis and characterization of the neutral three-coordinate [aluminum and gallium] thiolate complexes Al[S(2,4,6-tert-Bu3C6H2)]3 and Ga[S(2,4,6-tert-Bu3C6H2)]3
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Formation of Separated versus Contact Ion Triplets in Magnesium Thiolates. Synthesis and Characterization of [Mg(15-crown-5)(SCPh 3
No full textSynthesis and Structural Characterization of Lithium Thiolates:Â Dependence of Association and Aggregation on Donor Hapticity and Ligand Size and Synthesis of the First Trimeric Lithium Thiolate [Li(THF)SR] 3
No full textA Novel Group of Alkaline Earth Metal Amides:Â Syntheses and Characterization of M[N(2,6- i
No full textLewis Base Coordination versus Cation−π Interaction in Monomeric and Hexameric Potassium Thiolates
No full textSynthesis and characterization of halogeno- and pseudo-halogeno-thallium(III) porphyrin complexes. Variation of the co-ordination geometry as a function of the axial ligand
No full textSeveral thallium(III) porphyrin complexes [Tl(por)X] with the axial ligand X = MeCO2, CF3CO2, Cl, Br, I, CN, SCN or N3, have been obtained via ligand-exchange reactions from the corresponding thallium(III) trifluoroacetates. All compounds were characterized by 1H NMR, UV/VIS spectroscopy, and elemental analysis. Fourteen compounds were investigated in detail by X-ray crystallography to obtain information on the influence of the axial ligand on the macrocycle core conformation in main-group metalloporphyrins and to establish the molecular stereochemistry of thallium(III) porphyrins with cyano, acetato, thiocyanato, bromo, iodo and azido groups as axial ligands
Structure and Conformation of Photosynthetic Pigments and Related Compounds 9 On the Structure and Macrocycle Conformation of Two Copper(II) Rhodochlorin Derivatives and Two Related Rhodoporphyrins
No full textCrystal structure analyses of (rhodochlorinato-15-acetic trimethyl ester)copper(II) 3 and (31,32-didehydro-rhodochlorinato-15-formic acid trimethyl ester)copper(II) 4 reveal intriguing multiple macrocycle conformations of the metallochlorins in the crystal. The observed conformations range from almost planar macrocycles to distorted macrocycles with individual atoms being displaced up to 0.72 A from the mean plane. The nonplanar macrocycles show a S4-ruttled macrocycle distortion with significant distortions for the weso-carbons and tilting of the Cb–Cb axes. A comparison with the related free base porphyrins rhodoporphyrin-15-acetic acid trimethyl ester 5 and rhodoporphyrin dimethyl ester 6 shows that the conformational distortion is due to the mixing of metal and substituent effects, hydroporphyrin character, and packing forces. Crystal data: 3, monoclinic, P21, a = 12.096(4) A, b = 14.307(4) Å, c = 22.343(9) A, β = 104.94(4)°, Z = 4 (2 indep. mol.), R = 0,069 for 8141 reflections with I \u3e 2.0a(I); 4, triclinic, P1, a = 10.528(3) A, b = 10.646(4) A, c = 34.026(13) A, a = 89.81(4)°, β = 88.72(3)°, y = 60.38(2)°, Z = 4 (4 indep. mol.), R = 0.073 for 9446 reflections with I \u3e 2.5 σ(I); 5, triclinic, PĪ, a = 9.591(2) A, b = 12.959(4) A, c = 13.453(4) A, a = 105.86(2)°, β = 92.67(2)°, γ = 96.12(2)°, Z = 2. R = 0.060 for 4990 reflections with I \u3e 2.5 σ(I); 6, triclinic, PĪ, a = 8.908(4) A, b = 12.895(5) A, c = 13.482(6) A, a = 102.74(3)°,β = 90.38(4)°, y = 91.84(3)°, Z = 2, R = 0.089 for 3369 reflections with I \u3e 2.0σ(I). © 1995 Verlag der Zeitschrift für Naturforschung. All rights reserved
