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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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TL;DR: In this article, single-crystal X-ray diffraction analysis of PdCl2 (dppfO2) showed a rare tetrahedral geometry at a d8 metal center; physical and spectroscopic characterisations indicate a paramagnetic species.

32 citations

Journal ArticleDOI
TL;DR: Those compounds with greater distortion from the ideal tetrahedral geometry showed a larger-magnitude axial magnetic anisotropy (D) together with a high rhombicity factor (E/D), and thus, slow magnetic relaxation effects also appear.
Abstract: A family of tetrahedral mononuclear CoII complexes with the cytosine nucleobase ligand is used as the playground for an in-depth study of the effects that the nature of the ligand, as well as their noninnocent distortions on the Co(II) environment, may have on the slow magnetic relaxation effects. Hence, those compounds with greater distortion from the ideal tetrahedral geometry showed a larger-magnitude axial magnetic anisotropy (D) together with a high rhombicity factor (E/D), and thus, slow magnetic relaxation effects also appear. In turn, the more symmetric compound possesses a much smaller value of the D parameter and, consequently, lacks single-ion magnet behavior.

32 citations

Journal ArticleDOI
TL;DR: In this article, the reaction of copper(I) chloride with acetonethiosemicarbazone (tscac) in a copper to tscac molar ratio of 1:2 forms the cationic complex [Cu(tscAC)2]Cl (1).
Abstract: The reaction of copper(I) chloride with acetonethiosemicarbazone (tscac) in a copper to tscac molar ratio of 1:2 forms the cationic complex [Cu(tscac)2]Cl (1). When the ratio of the copper to tscac was reduced to 1:1, a dimeric complex [Cu2Cl2(tscac)2]2 (2) was obtained. In complex 2, two CuCl2 species act as bridging groups between two Cu(tscac)2 moieties forming an eight-membered ring, whereas in complex 1, there is no CuCl2 moiety in the structure. In both complexes the copper(I) center is coordinated in a distorted tetrahedral geometry to two tscac groups through the sulfur and the imine nitrogen atom. In dimeric complex 2, the sulfur atom in each tscac ligand coordinates weakly to copper(I) in the CuCl2 moiety giving the distorted tetrahedral geometry. For the free ligand, the νc=s vibration at 789 cm−1 appears at lower energy than in complexes 1 and 2 (754 and 744 cm−1 respectively) indicating coordination at the sulfur atom. The complexes synthesized by either electrochemical or chemical methods are identical. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

32 citations

Journal ArticleDOI
TL;DR: The umbrella distortions of the trigonal bipyramid are identified as being the most relevant types of transition state structures for the phosphoryl group transfer reactions for phosphatases and this may be related to the possibility that vanadium is an inhibitor for enzymes that support both exploded and five-coordinate transition states.

32 citations

Journal ArticleDOI
TL;DR: In this paper, the title compound, [Ag(dppe)2]NO3, is bis-chelated by two dppe ligands so that the silver atom is four-coordinate; Ag-P 2.527(3) A. The structure was refined by a full-matrix least squares procedure to final R = 0.063 for 3776 reflections with I ≥ 2.
Abstract: The title compound, [Ag(dppe)2]NO3, is shown to be bis-chelated by two dppe ligands so that the silver atom is four-coordinate; Ag-P 2.488(3), 2 × 2.523(3) and 2.527(3) A. Distortions from ideal tetrahedral geometry are related to the restricted bite distances of the dppe ligands such that the P(1)-Ag-P(2) and P(3)-Ag-P(4) angles are 84.5(1) and 83.8(1)°, respectively. The compound crystallizes in the monoclinic space group P21/n with unit cell dimensions a = 14.834(2), b = 19.795(2), c = 15.856(3) A, β = 93.09(1)° and Z = 4. The structure was refined by a full-matrix least-squares procedure to final R = 0.063 for 3776 reflections with I ≥ 2.5 σ(I).

32 citations


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