Effects of Steric Constraint on Chromium(III) Complexes of Tetraazamacrocycles, 2. Comparison of the Chemistry and Photobehavior of thetrans-Dichloro- andtrans-Dicyano- Complexes of Cyclam, 1,4-C2-Cyclam, and 1,11-C3-Cyclam†

2005 ◽  
Vol 44 (25) ◽  
pp. 9518-9526 ◽  
Author(s):  
Paul S. Wagenknecht ◽  
Chuanjiang Hu ◽  
Denise Ferguson ◽  
Lawrence C. Nathan ◽  
Robert D. Hancock ◽  
...  
Keyword(s):  
Steric Constraint

Effects of steric constraint on chromium(III) complexes of tetraazamacrocycles, 4: Comparison of the trans-difluoro-complexes of tet a, 1,4-C2-cyclam, and 1,11-C3-cyclam

2007 ◽  
Vol 360 (5) ◽  
pp. 1482-1492 ◽  
Author(s):  
Michael T. Vagnini ◽  
W. Caleb Rutledge ◽  
Chuanjiang Hu ◽  
Donald G. VanDerveer ◽  
Paul S. Wagenknecht
Keyword(s):  
Steric Constraint

scholarly journals Effect of Steric Constraint at the γ-Backbone Position on the Conformations and Hybridization Properties of PNAs

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Matthew J. Crawford ◽  
Srinivas Rapireddy ◽  
Raman Bahal ◽  
Iulia Sacui ◽  
Danith H. Ly
Keyword(s):  
Nucleic Acids ◽  
Peptide Nucleic Acids ◽  
Side Chains ◽  
Spectroscopic Techniques ◽  
Sterically Hindered ◽  
Steric Constraint

Conformationally preorganized peptide nucleic acids (PNAs) have been synthesized through backbone modifications at the γ-position, where R = alanine, valine, isoleucine, and phenylalanine side chains. The effects of these side-chains on the conformations and hybridization properties of PNAs were determined using a combination of CD and UV-Vis spectroscopic techniques. Our results show that the γ-position can accommodate varying degrees of sterically hindered side-chains, reaffirming the bimodal function of PNAs as the true hybrids of “peptides” and “nucleic acids.”

scholarly journals Steric Constraint in the Primary Photoproduct of an Archaeal Rhodopsin from Regiospecific Perturbation of C−D Stretching Vibration of the Retinyl Chromophore

2005 ◽  
Vol 127 (46) ◽  
pp. 16036-16037 ◽  
Author(s):  
Yuki Sudo ◽  
Yuji Furutani ◽  
Akimori Wada ◽  
Masayoshi Ito ◽  
Naoki Kamo ◽  
...  
Keyword(s):  
Stretching Vibration ◽  
Steric Constraint

Cationic cyclocodimerization. 4. Syntheses and structures of [3.3]metacyclophane derivatives. Cyclization controlled by an orbital interaction and a steric constraint

1987 ◽  
Vol 52 (8) ◽  
pp. 1409-1413 ◽  
Author(s):  
Jun Nishimura ◽  
Akihiro Ohbayashi ◽  
Yuzuru Horiuchi ◽  
Yukihiro Okada ◽  
Shunichi Yamanaka ◽  
...  
Keyword(s):  
Orbital Interaction ◽  
Steric Constraint

Recherches sur les composés éthyléniques. V. Liens entre la structure des akènes et leur fréquence de vibration νC = C influence des effets structuraux et établissement d'une relation de topo-information

1975 ◽  
Vol 53 (17) ◽  
pp. 2580-2585 ◽  
Author(s):  
J. H. Basso ◽  
S. Delattre ◽  
R. Lanteri ◽  
R. Luft
Keyword(s):  
Quantitative Analysis ◽  
Spectroscopic Data ◽  
Chemical Method ◽  
Molecular Conformation ◽  
Ethylenic Bond ◽  
The Relationship ◽  
Steric Constraint

An examination of spectroscopic data for 43 alkenes reveals the influence of increasing substitution at the carbon atoms α or β to the ethylenic bond. The presence of a particularly large steric constraint requires that there be a single preferred molecular conformation: in such a case the frequency of the νC = C vibrator is strongly decreased (10 cm−1).A quantitative analysis of the phenomenon can be achieved using the "topological-chemical method D.A.R.C.". Topologic-information relationships could be developed for the two series 2-alkylethylenes and 2,2-dialkylethylenes. These permit the calculation of the contribution of each topological site to the frequency νC = C. For the first series, the relationship, based on 9 compounds, permits predictions about 30 others. For the second series, deductions are made concerning 159 compounds from a relationship established on a base of 13 compounds. [Journal translation]

Inherent chirality in calix[8]arenes exploiting the steric constraint of two intercrossing polyether chains

1996 ◽  
Vol 37 (42) ◽  
pp. 7627-7630 ◽  
Author(s):  
Corrada Geraci ◽  
Mario Piattelli ◽  
Placido Neri
Keyword(s):  
Inherent Chirality ◽  
Steric Constraint
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