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Tetrahedral molecular geometry

About: Tetrahedral molecular geometry is a research topic. Over the lifetime, 1795 publications have been published within this topic receiving 30706 citations.


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Journal ArticleDOI
TL;DR: In this paper, the structure of 6-benzylsparteine toluene solvate was solved by the direct method and those of b and c by the heavy atom method.
Abstract: (+)-6-Benzylsparteine (a) crystallizes in orthorhombic systems; P212121, a=10.711(1), b=25.868(4), c=6.804(1) A, and Z=4;EtMgBr-(+)-6-benzylsparteine (b) also belongs to orthorhombic system; P212121, a=11.020(4), b=23.660(10), c=8.666(6) A and Z=4; and MgBr2−(+)-6-benzylsparteine toluene solvate (c), orthorhombic system; P212121, a=16.654(3), b=19.723(4), c=8.637(2) A and Z=4. The structure of a was solved by the direct method and those of b and c by the heavy atom method. Refinements were carried out by the block-diagonal least-squares procedure; R values are: (a) 0.055. (b) 0.169, and (c) 0.118, respectively for 1342, 1445, and 1501 reflections. The a molecule takes a one-boat form, whereas by, coordination to the Mg atom it changes into all-chair form in b and c molecules. The Mg atom has a distorted tetrahedral geometry; b, Mg–N=2.13(4) and 2.19(4), Mg–C 2.34(5) and Mg–Be=2.506(16) A and N–Ng–N=83.1(14)°; c, Mg–N=2.08(3) and 2.17(3), Mg–Br=2.454(12) and 2.473(12) A and N–Mg–N=85.8(10)°. The structures...

16 citations

Journal ArticleDOI
TL;DR: In this article, the four-coordinate geometry of alkyl-aryl dithiocarbamate complexes has been investigated and characterized using X-ray crystallographic analysis.
Abstract: Zn(II), Cd(II), and Hg(II) complexes of alkyl-aryl dithiocarbamate formulated as ZnL1L2 (1), CdL1L2 (2), and HgL1L2(3) have been synthesized and characterized. X-ray crystallographic analysis shows that the Hg(II) complex, [(C6H5N(et)CS2)Hg(C6H5N(butyl)CS2)] is four coordinate with distorted tetrahedral geometry. Distortions from the regular tetrahedral geometry are attributed to the restricted bite angles of the dithiocarbamate ligand. The spectroscopic analyses confirmed the proposed four coordinate geometry for the complexes in which the metal ions are coordinated to two molecules of the ligands through the S-atoms. X-ray analysis of the mercury complex revealed a compositional disorder between the alkyl groups at certain carbon positions.

16 citations

Journal ArticleDOI
TL;DR: Among these compounds, the ligand and Zn(2+) complex, exhibited the potent ABTS (2,2'-azino-bis(3-ethyl benzthiazoline-6-sulfonic acid) radical scavenging activity, comparable to that of vitamin C.

16 citations

Journal ArticleDOI
01 Sep 1936
TL;DR: In this paper, the polarisation of Raman lines of sulphur and phosphorus was investigated with reference to their molecular structures, and it was shown that the lines at 150 and 434 are completely depolarised and belong to anti-symmetric vibrations.
Abstract: The polarisation of Raman lines of sulphur and phosphorus is investigated with reference to their molecular structures. An intense Raman spectrum of liquid phosphorus has yielded three lines the state of polarisation of which conforms to the Raman-active vibrations of a tetrahedral molecule. The molecule of sulphur is considered to be a symmetrical puckered ring made up of two squares of four atoms each, one square placed at 45° with respect to the other. To explain the strong infra-red absorptions, the neighbouring atoms in the plane of each square are assumed to be connected with co-ordination bonds which give rise to electric dipoles causing absorption. The two lines 470 and 216 which are well-polarised are assigned to two symmetrical oscillations of such a model, 470 to the vibration in which the four atoms in each square move towards or away from the centre of the square and 216 to the vibration in which the two squares move towards or away from each other. The lines at 150 and 434 are completely depolarised and belong to anti-symmetric vibrations. The well-known changes of sulphur on heating are explained on the basis of this new molecular structure. A method of distilling high-boiling-point substances is also described in the paper.

16 citations

Journal ArticleDOI
TL;DR: In this article, a theoretical formulation for computing the halfwidths of spectral lines belonging to tetrahedral molecules is presented, which is based on Anderson-Tsao-Curnutte theory.
Abstract: A theoretical formulation is presented within the framework of Anderson-Tsao- Curnutte theory for calculating the half-widths of spectral lines belonging to tetrahedral molecules. The importance of tetrahedral symmetry in the change distribution and in the wave functions is emphasized. Expressions for the interruption functions S 2 (b) have been derived for octopole-dipole, octopole-quadrupole, octopole-octopole, octopole-hexadecapole, hexadecapole- hexadecapole, anistropic dispersion interactions as well as for an assumed overlap interaction potential. The earlier theoretical work of Tejawni and Yamamoto and Hirono is shown to be inappropriate for molecules of tetrahedral symmetry.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202314
202240
202143
202039
201939
201847