Cyclacenes having dislocated rings

Türker, Burhan Lemi
Clockwise and anticlockwise dislocation operation on cyclacenes were defined. Certain types of dislocated cyclacenes were subjected to AMI type semiempirical molecular orbital calculations in order to get some idea about these nonexistent structures. They were predicted to be more stable than the isomeric cyclacenes. The cryptoannulenic effect, which is the characteristic feature of the cyclacenes. subsides or disappears depending on the type of the dislocated system.


Mumford-shah regularizer with spatial coherence
Erdem, Erkut; Sancar-Yilmaz, Aysun; Tarı, Zehra Sibel (2007-01-01)
As recently discussed by Bar, Kiryati, and Sochen in [3], the Ambrosio-Tortorelli approximation of the Mumford-Shah functional de-Lines an extended line process regularization where the regularizer has an additional constraint introduced by the term rho vertical bar del v vertical bar(2). This term mildly forces some spatial organization by demanding that the edges are smooth. However, it does not force spatial coherence such as edge direction compatibility or edge connectivity, as in the traditional edge d...
Cyclacene tubes having silaannulenic peripheries - AM1 treatment
Türker, Burhan Lemi; Bayer, I (2000-07-01)
The cyclacene tubes T(R, r) consisting of the Huckel type intermolecularly unioned (r = 6) cyclacenes having R arenoid rings (R = 3 - 6) and a single silaannulenic periphery are considered for AM1 type semiempirical molecular orbital calculations. The cases in which the silaannulenic periphery occupies different locations (layers A-D from top to middle) along the tube axis are investigated. It has been found that doping of silicon atoms in the top (or bottom) periphery of the cyclacene tubes has a stabilizi...
Fluorinated cyclacenes - AM1 treatment
Türker, Burhan Lemi (2002-07-05)
The peripherally fluorinated Huckel type cyclacenes having 3-7 benzenoid rings (R) were considered for AM1 (restricted Hartree-Fock) type semiempirical quantum chemical treatment. The cyclacenes having one or two of the peripheries completely fluorinated constitute type-I and type-H structures, respectively. All of them were found to be stable. Type-I systems are endogenic but type-II structures, R:5 onwards are exogenic. The cryptoannulenic effect was found to be operative partly on the heats of formations...
YILMAZ, E; KUCUKYAVUZ, Z (Wiley, 1994-04-01)
Mean-square dipole moment values of styrene/4-vinylpyridine (S4VP) copolymers determined at 25-60-degrees-C in 1,4-dioxane solutions were related to the microstructure of the chains. Data on the synthesis and dipole moments of S4VP copolymers were used to calculate the distribution of triad fractions and effective dipole moments of styrene, S-centred, and 4-vinylpyridine, V-centred, fractions in the copolymer chains. The relative magnitudes of the effective dipole moment values calculated for each type of t...
Two Dimensional DOA Estimation using Uniform Rectangular Array with Mutual Coupling
Caliskan, Mustafa; Tuncer, Temel Engin (2014-04-25)
In this study, joint estimation of azimuth and elevation angles with uniform rectangular array(URA) in the presence of mutual coupling is discussed. Mutual coupling coefficients are also estimated with the estimated arrival angles. By using these coupling coefficient estimates, two dimensional refined search of direction of arrival angles(DOA) is done. Several Monte Carlo experiments are performed and it is observed that the refined angle estimates are more accurate compared to the initial estimates which d...
Citation Formats
B. L. Türker, “Cyclacenes having dislocated rings,” JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM, pp. 235–241, 2001, Accessed: 00, 2020. [Online]. Available: