62987-07-9Relevant academic research and scientific papers
A general route for the synthesis of flexible porphyrin dimers
Twyman, Lance J.,Sanders, Jeremy K. M.
, p. 6681 - 6684 (2007/10/03)
The synthesis of two cyclic porphyrin dimers is reported. In each case the porphyrins are connected by a rigid butadiyne link, and a flexible alkyl chain tether. The length of this tether controls both the porphyrin-porphyrin distance, and porphyrin-porphyrin geometry. It is hoped that the extra flexibility designed within these molecules will enable them to act as general catalytic hosts for future study.
Aryl ring rotation in porphyrins. A carbon-13 NMR spin-lattice relaxation time study
Noss, Lori,Liddell, Paul A.,Moore, Ana L.,Moore, Thomas A.,Gust, Devens
, p. 458 - 465 (2007/10/03)
Overall tumbling and internal rotational motions in porphyrins bearing meso aryl substituents and, in some cases, flanking alkyl groups at the β-pyrrolic positions have been determined using 13C spin-lattice relaxation time measurements. In deuteriochloroform solution at 303 K, the overall reorientation of all three porphyrins investigated occurs with diffusion coefficients of ～1 × 109 s-1. In porphyrins with only hydrogen at the β-pyrrolic positions, the meso phenyl rings undergo rotations about their single bonds to the porphyrin with diffusion coefficients of ～4 × 109 s-1. Introduction of methyl substituents at the β-pyrrolic positions adjacent to the phenyl rings reduces these motions, but only to ～1 ×109 s-1. Thus, significant internal motions are present in both types of molecules. These motions occur on the time scale of many photoinduced electron and energy transfer processes in porphyrins covalently linked to electron or energy donors or acceptors through meso aryl groups. Thus, the internal librational motions may affect rates of photoinduced electron and energy transfer, even in relatively "rigid" molecular constructs.
Vibrational and electronic spectra of new liposoluble metalloporphyrins in a nonpolar noncoordinating solvent
Ringuet, Michel,Girard, Denis,Chapados, Camille
, p. 1070 - 1079 (2007/10/02)
A new liposoluble porphyrin, 2,7,12,17-tetrahexyl-3,8,13,18-tetramethylporphin (THTMP), and its complexes with divalent (Mg, Co, Ni, Cu, Zn, Cd, Hg) and trivalent (Mn, Fe) metals have been synthesized.The electronic, infrared, and far-infrared spectra of
