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.

Synthesis and characterization of Group 11 and 12 complexes containing a new thioether-functionalized and pyridine-based bis(phosphine) ligand, 2,6-bis[2-(diphenylphosphino)ethyl-sulfanylmethyl]pyridine

Abstract: The new ligand 2,6-bis[2-(diphenylphosphino)ethylsulfanylmethyl]pyridine, 2,6-(Ph2PCH2CH2SCH2)2C5H3N (L1), has been synthesized. Reaction of [Cu(MeCN)4][CF3SO3] or AgNO3 with 1 molar equivalent of L1 gave [CuL1][CF3SO3] 1 or [AgL1][NO3] 2, in good yield. Reaction of equimolar quantities of L1 and AuI, followed by precipitation with AgO3SCF3, gave [AuL1][CF3SO3] 3. In the crystal structure of 2·H2O, L1 co-ordinates to Ag via a P2S2 donor set in a distorted tetrahedral geometry. Reaction of M(O3SCF3)2 (M = Zn or Cd) with 1 molar equivalent of L1 gave [ML1(O3SCF3)2] (M = Zn 4 or Cd 5). Crystal structure analysis of 5 showed that the molecule has symmetry 2, with all five donor atoms of L1 and a pair of monodentate CF3SO3– ligands arranged in an unusual distorted pentagonal bipyramidal co-ordination geometry about the cadmium centre.

The Preparation, Characterization, X-ray Structural Analysis, and Thermogravimetric Analysis of Tetrakis[1,3-Dimethyl-2(3H)-Imidazolethione]Zinc(II) Nitrate and Tetrafluoroborate

Abstract: Two new compounds, [Zn(dmit)4][BF4]2 and [Zn(dmit)4][NO3]2, have been synthesized and characterized via standard solid and solution state methods including single crystal X-ray crystallography (dmit = 1,3-dimethyl-2(3H)-imidazolethione). [Zn(dmit)4][BF4]2 crystallizes in space group Pbcn with a = 11.954(2) A, b = 21.260(4) A, c = 12.749(3) A, Z = 4. [Zn(dmit)4][NO3]2 crystallizes in space group I 4 1 /a with a = b = 11.091(4) A, c = 22.713(5) A, Z = 4. Both structures display a compressed tetrahedral geometry in the zinc coordination sphere similar to previously reported isopropyl and n-butyl analogs. The degree of distortion is closer to that noted for the recently reported methyl isopropyl analog than to the methyl n-butyl complex. There are no significant differences between the nitrate and tetrafluoroborate coordination spheres, and the source of distortion appears to be close intramolecular contacts. Thermogravimetric analysis results suggest that both complexes decompose to yield ZnS2 instead of ZnS. A two new ionic complexes of 1,3-dmethyl-2(3H)-imidazolethione (dmit) containing tetra-S-coordinated Zn(II) have been synthesized and structurally characterized. Both nitrate and tetrafluoroborate analogs have distorted tetrahedral coordination geometry around the zinc ions similar to that noted for complexes with bulkier alkyl imidazolethiones. There are no significant differences between the nitrate and tetrafluoroborate coordination spheres, and the source of distortion appears to be close intramolecular contacts.

Germanium(IV) chloride at 193 K.

Abstract: Single crystals of germanium(IV) tetrachloride, GeCl4, were grown at 193 K. In the crystal structure, the isolated mol­ecules have very well realised tetrahedral geometry.

Crystal Structure of a Novel Complex of 1,3-Bis(2-methoxybenzene)triazene with Mercury(II)

Abstract: The crystal structure of [ClHgL], L = 1,3-bis(2-methoxybenzene)triazene was determined by X-ray diffraction. The complex crystallizes in the triclinic system, space group P1 with a = 9.2614(5), b = 11.4127(6), c = 16.3378(9)A, α = 110.401(5)°, β = 106.075(5)°, γ = 90.302(5)°, V = 1545.3(2)A3, Z = 4. The structure was solved by the direct method (SHELXTL-98) and had refined R value of 0.0361 for 4709 reflections (I > 2σ(I)). The Hg atom is coordinated by a Cl atom as well as O, N and N atoms of the ligand in a tetrahedral geometry.