Stereochemistry of the toluene solvate of .alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatozinc(II)

Scheidt, W. Robert; Kastner, Margaret E.; Hatano, Keiichiro

doi:10.1021/ic50181a041

Cited by 117 publications

(72 citation statements)

References 58 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the solid phase, stabilization is slightly bigger (301 kJ · mol −1 ) than in the gas phase (289 kJ · mol −1 ). X-ray diffraction studies (37,46) have reported planar configuration for both TPP and ZnTPP. Therefore, the small difference between their values of enthalpy of atomization reveal that one N-H covalent bond in gaseous TPP has almost the same mean dissociation enthalpy that two N-Zn co-ordination bonds.…”

Section: Discussionmentioning

confidence: 99%

A thermochemical study of 5,10,15,20-tetraphenylporphine zinc(II) by rotating bomb combustion calorimetry and by Knudsen effusion experiments

Patiño

Norzagaray-Campos

Torres

2002

The Journal of Chemical Thermodynamics

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

A thermochemical study of 5,10,15,20-tetraphenylporphine zinc(II) by rotating bomb combustion calorimetry and by Knudsen effusion experiments

Patiño

Norzagaray-Campos

Torres

2002

The Journal of Chemical Thermodynamics

View full text Add to dashboard Cite

“…Further, Scheidt et al experimentally determined a density of 1.275 g cm 3 for˛,ˇ, , υ-tetraphenylporphinatozinc(II) toluene, a porphyrin similar to TPP-P-thiol and TPP-P-disulfide, using x-ray diffraction techniques. 36 The thickness can be converted to a surface concentration using this estimated density (1.275 g cm 3 ) for TPP-P-thiol and TPP-P-disulfide, as follows The values for thickness (Eqn. (6)), surface concentration (Eqn.…”

Section: Coverage Calculated From Xps Gold Ratios For a Uniform Thin mentioning

confidence: 99%

“…Scheidt et al experimentally determined a density of 1.275 g cm 3 for˛,ˇ, , υ-tetraphenylporphinatozinc(II) toluene, a porphyrin similar to TPP-P-thiol and TPP-P-disulfide, using x-ray diffraction techniques. 36 Using this value as the approximate density of TPP-P-thiol and TPP-P-disulfide, the values for the inelastic mean free paths, (KE) and (KE, ), of gold, carbon, nitrogen, oxygen and sulfur through an organic overlayer such as TPP-P-thiol and TPP-P-disulfide are essentially equal (Table A1). Thus, for simplicity, all calculations in the article will employ the values calculated using only the kinetic energy, (KE), as shown in Table 5.…”

Section: Appendix A: Inelastic Mean Free Path Calculationsmentioning

confidence: 99%

Determination of surface coverage for tetraphenylporphyrin monolayers using ultraviolet visible absorption and x‐ray photoelectron spectroscopies

Bramblett

Boeckl

Hauch

et al. 2002

Surface & Interface Analysis

View full text Add to dashboard Cite

The surface coverage of thiolated tetraphenylporphyrin derivatives assembled on gold has been determined using ultraviolet/visible absorption spectroscopy (UV/Vis) and x-ray photoelectron spectroscopy (XPS). Ultraviolet/visible absorption spectroscopy was used to calculate the surface concentration of porphyrin molecules through two independent approaches: the first measured the porphyrin concentration in solution after the displacement of a porphyrin monolayer from the gold surface; and the second directly exploited the absorptivity of the monolayers. Furthermore, we determined experimentally the extinction coefficients for the porphyrin monolayers and verified that the extinction coefficients are in agreement with a simple theoretical model that is frequently applied to porphyrin monolayers. Two separate models, both based on a uniform overlayer, were applied to the XPS data to determine the surface concentration of the porphyrin monolayers. Finally, for comparison of the UV/Vis and XPS results, a model of an ordered tetraphenylporphyrin arrangement on a surface was utilized to calculate coverage. The results of these two spectroscopic techniques differed by as much as a factor of 4, but they were generally comparable to those for related porphyrin systems. Determination of the surface coverage of monolayers is often challenging, thus the comparison of two independent experimental techniques allows for a more accurate estimation of monolayer coverage, and demonstrates the often unrealized potential to calculate the coverage of organic monolayers using XPS.

show abstract

“…Cette drviation relativement faible est une consrquence de rassociation de la molrcule en dim~re (voir Empilement cristallin). Elle est nulle dans la meso-t&raphrnyl porphyrine de zinc (TPPZn) solvatre ou non par le tolurne (Scheidt, Kastner & Hatano, 1978;Scheidt, Mondal, Eigenbrot, Adler, Radonovitch & Hoard, 1985) [contenant N(2) et N(4)] se rel+vent au-dessus de ce plan. Sur la Fig.…”

Section: C76h92n4znunclassified

Structure de la tétra(p-n-octylphényl)-5,10,15,20 porphine de zinc(II)

Chiaroni¹,

Riche²,

Dubois³

1988

Acta Crystallogr C

View full text Add to dashboard Cite

Abstract. C76H92N4Zn, Mr= 1126-97, triclinic, P1, a=10.397(2), b=13.236(4), c=25.149(5) A, ct =97.76 (1), fl= 105.96 (1), y=84.84 (1) °, V= 3292 (3) A 3, Z = 2, D x = 1.14 Mg m -3, 2(Cu Ks) = 1.5418 A, /a = 0.797 mm-', F(000) = 1212. Final R = 0.099 for 4041 observed reflexions. The porphine skeleton is non-planar. The Zn atom is only 0.15 A out of the plane of the core. Mean Zn...N distance is 2-024 (9) A,. The pertinent feature of the structure is the presence of four long aliphatic chains attached to the phenyl rings and lying approximately in the mean plane of the core. They adopt a centrosymmetric disposition, two of them being fully extended while the others are bent. The porphyrin nuclei are stacked in piles of dimers between which the chains are densely packed in parallel rows.

show abstract

Stereochemistry of the toluene solvate of .alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatozinc(II)

Cited by 117 publications

References 58 publications

A thermochemical study of 5,10,15,20-tetraphenylporphine zinc(II) by rotating bomb combustion calorimetry and by Knudsen effusion experiments

A thermochemical study of 5,10,15,20-tetraphenylporphine zinc(II) by rotating bomb combustion calorimetry and by Knudsen effusion experiments

Determination of surface coverage for tetraphenylporphyrin monolayers using ultraviolet visible absorption and x‐ray photoelectron spectroscopies

Structure de la tétra(p-n-octylphényl)-5,10,15,20 porphine de zinc(II)

Contact Info

Product

Resources

About