Topic
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, the rotational potential of the tunnel splitting of the librational groundstate of a molecule is investigated and it is shown that the observed shift of tunnel lines to smaller energies can be correlated with the change of the lattice parameter and to the exponent of an effective potential.
19 citations
TL;DR: In this paper, new ligands derived from 5,5-dimethyldipyrromethane and their corresponding neutral complexes with Zn (II) and Pd(II) are described.
Abstract: New ligands derived from 5,5-dimethyldipyrromethane and their corresponding neutral complexes with Zn(II) and Pd(II) are described The ligands incorporate either hexacatenar [H2(1n), n = 1, 10, 12, 14 and 16], tetracatenar [H2(2n), n = 1 and 16] or an extended dicatenar structure [H2(3n), n = 1 and 16] Single crystal X-ray structure determinations on [Zn2(11)2] and [Zn2(31)2] confirm a distorted tetrahedral geometry at Zn(II) to afford double-stranded helical structures, while the Pd(II) species [Pd(31)] shows a distorted square planar geometry with the ligand adopting an alternative hairpin conformation The metal-free hexacatenar ligands H2(1n) (n = 10, 12, 14, 16) and the corresponding complexes [Zn2(116)2] and [Pd(1n)] (n = 12, 14, 16) are not mesomorphic However, the tetracatenar complex [Zn2(216)2] generates a smectic mesophase, as confirmed by X-ray diffraction, while [Pd(216)] and the metal-free ligand H2(216) show no mesomorphic behaviour Two of the extended dicatenar compounds, H2(316) and [Zn2(316)2] are non-mesomorphic, while [Pd(316)] displays a smectic A phase
19 citations
TL;DR: Bis{μ-[(dimercaptomethylene)propanedinitrilato-S,S‘]}tetrakis(4-methylpyridine)dizinc(II)−chloroform was obtained by the reaction of ZnCl2 with (NC)2CCS2K2 in a solution of 4-methyl pyridine, EtOH, and CHCl3.
Abstract: Bis{μ-[(dimercaptomethylene)propanedinitrilato-S,S‘]}tetrakis(4-methylpyridine)dizinc(II)−chloroform was obtained by the reaction of ZnCl2 with (NC)2CCS2K2 in a solution of 4-methylpyridine, EtOH, and CHCl3. The zinc atom in the dimer has a tetrahedral geometry. Each of the two (dimercaptomethylene)propanedinitrilato S atoms bridges two bis(4-methylpyridine)zinc moieties to give an eight-membered ring even though an adduct has effectively been formed. The Zn−N bond lengths are 2.035(4) and 2.077(3), A and those of Zn−S are 2.317(1) and 2.321(1) A, respectively.
19 citations
TL;DR: In this paper, the precursors of Cadmium iodide with caffeine (II) and polymeric Cd-containing chains with bridging halide ions and water molecules in transposition and connected with each other due to hydrogen bonding with participation of caffeine (caf) and water molecule, were prepared and characterized by powder and single crystal X-ray diffraction, IR vibrational spectroscopy, 1H NMR, ESI-MS, thermal analysis and DFT calculations.
19 citations
TL;DR: In this paper, the synthesis, characterization, and mesomorphic properties of a new series of Schiff bases 2a-h and metal complexes 1a- h-M are prepared and their mesomorph properties studied.
19 citations