Articles written in Journal of Chemical Sciences
Volume 127 Issue 4 April 2015 pp 663-670 Regular Articles
series of antipodal 𝛽-trisubstituted
Volume 128 Issue 4 0000 pp 501-509 Regular Articles
Two series of non-solvated structures of 5,10,15,20-tetrakis(2’,6’/3’,5’-difluorophenyl)porphyrins,H2T(2’,6’/3’,5’-DFP)P and their metal (Cu(II) and Zn(II)) complexes were determined by single crystal XRD.H2(2’,6’-DFP)P, 1 and its metal (Cu(II), 2 and Zn(II), 3) complexes showed near planar geometry of the porphyrinring with the maximum root-mean-square (r.m.s.) which is the average deviation of the 24 core atomsfrom their least-squares plane by 0.056(3) Å while MT(3’,5’-DFP)P (Cu(II), 4 and Zn(II), 5) structures featuresignificant distortion of the macrocycle (r.m.s. = 0.22(2) Å). Nearly planar structures 1-3 revealed morenumber of intermolecular short contacts than that observed in nonplanar structures 4 and 5. Normal coordinatestructure decomposition analysis of the structures 1-3 revealed negligible wave distortion of the macrocyclebut the corresponding nonplanar 4 and 5 structures feature mainly ruffled combined with minimal saddled distortions.The increased nonplanarity of the less sterically hindered derivatives 4 and 5 has been ascribed tointermolecular interactions and/or crystal packing forces.
Volume 128 Issue 7 July 2016 pp 1047-1055 Regular Article
Crystal structures of solvated unsymmetrically substituted meso-tetraphenylporphyrins, 2,3,12,13, 17-pentachloro-5,7,8,10,15,18,20-hepta-phenylporphyrin, H₂TPP(Ph)₃(Cl)₅, 1 and its nickel(II), NiTPP(Ph)₃(Cl)₅, 2 were determined by single crystal XRD analysis. In addition, a new unsymmetricallysubstituted porphyrin, 2,3,12,13,17-pentacyano-5,7,8,10,15,18,20-heptaphenyl-porphinato nickel(II) complex, NiTPP(Ph)₃(CN)₅, 3 complex was synthesized and its solvated structure was examined by crystallography. These porphyrins exhibited dramatic nonplanar conformation of the macrocycle as evidenced from the averagedisplacement of the β-pyrrole carbon (±ΔCβ ) from the mean plane of the porphyrin ring and the trend in nonplanarity varies in the order: 2 (1.189(5) Å) > 1 (1.036(6) Å) > 3 (0.895(6) Å). The normal-coordinate structural decomposition analysis of these structures revealed mainly saddle distortion of the macrocycle combined with small degree of ruffled or domed distortions. The Hirshfeld surface analysis of structures 1-3 revealed solvate dependent intermolecular contacts with varying degree of H. . .H (43–49%), C. . .H (17–19%), H. . .Cl (25–30%) and N. . .H (~19%) contact contributions.
Volume 135, 2023
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