Coordination compounds of thallium(III). III. Vibrational spectra of several anionic and neutral complexes of thallium(III) chloride and iodide and the nature of these species in the solid state and in polar solvents

1968 ◽  
Vol 7 (4) ◽  
pp. 640-648 ◽  
Author(s):  
Richard A. Walton
Keyword(s):  
Solid State ◽  
Vibrational Spectra ◽  
Coordination Compounds ◽  
Polar Solvents

Formation of di- and polynuclear Mn(II) thiocyanate pyrazole complexes in solution and in the solid state

2018 ◽  
Vol 73 (11) ◽  
pp. 793-801
Author(s):  
Aleksej Jochim ◽  
Christian Näther
Keyword(s):  
Solid State ◽  
Coordination Compounds ◽  
Magnetic Measurements ◽  
Metal Cations ◽  
Chain Compound ◽  
Pyrazole Ligands

AbstractReaction of Mn(NCS)2with pyrazole leads to the formation of three compounds with the compositions Mn(NCS)2(pyrazole)4(1), [Mn(NCS)2]2(pyrazole)6(2) and Mn(NCS)2(pyrazole)2(3). Compound1, already reported in the literature, consists of discrete complexes, in which the Mn(II) cations are octahedrally coordinated by four pyrazole ligands and two terminally N-bonded thiocyanate anions. In compound2each of the two Mn(II) cations are coordinated octahedrally by three pyrazole ligands and one terminal as well as two bridging thiocyanate anions, which link the metal cations into dimers. In compound3also octahedrally coordinated Mn(II) cations are present but they are linked into chainsviacentrosymmetric pairs ofμ-1,3-bridging thiocyanate anions. Upon heating compound1loses the pyrazole co-ligands stepwise and is transformed into the chain compound3viathe dimer2that is formed as an intermediate. Magnetic measurements on compounds2and3reveal dominating antiferromagnetic interactions, as already observed for 1D Mn(NCS)2coordination compounds with pyridine based co-ligands.

Syntheses and vibrational spectra of some tris(alkanethiolato)mercurate(II) complexes, and crystal structure of the Hexakis(methanethiolato)dimercurate(II) dianion

1984 ◽  
Vol 37 (8) ◽  
pp. 1607 ◽  
Author(s):  
GA Bowmaker ◽  
IG Dance ◽  
BC Dobson ◽  
DA Rogers
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Vibrational Spectra ◽  
Crystal Data ◽  
Tetrahedral Geometry ◽  
Space Group ◽  
Spectroscopic Evidence ◽  
Distorted Tetrahedral Geometry ◽  
Complex Anions

The complexes [cation] [Hg(SR)3](R = Me, cation = Et4N+; R = But, cation = Et4N+, Bu4N+, [N(Ph3P)2]+) have been prepared. The crystal structure of the methanethiolate complex shows that it contains centrosymmetric dinuclear anions [(MeS)2Hg(�-SMe)2Hg(SMe)2]2- with distorted tetrahedral geometry about the mercury atoms. Vibrational spectroscopic evidence suggests that this complex dissociates on dissolution in ethanol to give mononuclear [Hg(SMe)3]- species. The ButS- complexes appear to exist as mononuclear [Hg(SBut)3]- species both in the solid state and in solution. The metal-sulfur stretching frequencies are assigned for all of the complexes studied, and the vibrational spectra are discussed in terms of the structures of the complex anions involved. Crystal data for [(C2H5)4N]2Hg2(SCH3)6 : a 8.656(5), b gS130(6), c 12.368(8) �; α 102.16(4), β 105.51(4), γ 105.29(4)�; space group P1, Z 1, R 0.034, Rw 0.042.

Phosphinohydrazines. Part IV. Coordination compounds of N,N-dimethyl,N′-diphenylphosphinohydrazine and N,N-dimethyl-N′-diphenylthiophosphinatohydrazine

1970 ◽  
Vol 48 (3) ◽  
pp. 401-404 ◽  
Author(s):  
E. W. Ainscough ◽  
L. K. Peterson ◽  
D. E. Sabourin
Keyword(s):  
Molecular Weight ◽  
Nuclear Magnetic Resonance ◽  
Coordination Compounds ◽  
Donor Site ◽  
Membered Ring ◽  
Monomeric Form ◽  
Coordinate Structure ◽  
Polar Solvents ◽  
Uncertain Structure ◽  
Ring Structures

A study of complexes of (a) N,N-dimethyl,N′-diphenylphosphinohydrazine, DPH, viz., Pd(DPH)Cl2, Pd(DPH)2Cl2, [Pd(DPH)2Cl]ClO4, Pt(DPH)2Cl2, Pt(DPH)Cl4, Hg(DPH)Cl2; (b) N,N-dimethyl,N´-diphenylthiophosphinatohydrazine, DPS, viz., Pd(DPS)Cl2, Pt(DPS)Cl4, Ag(DPS)NO3, Zn(DPS)Cl2, Cd(DPS)Cl2, and Hg(DPS)Cl2, and (c) N,N-dimethylhydrazine, DMH, viz., Zn(DMH)2Cl2 and Cd(DMH)Cl2, has been carried out using conductivity, molecular weight, infrared, and nuclear magnetic resonance measurements. DPH functions mostly as a unidentate ligand, with the phosphorus atom as the preferred donor site. Thus Pd(DPH)Cl2 is a chlorobridged dimer in solution in weakly polar solvents, while the monomeric form in polar solvents is of uncertain structure. A trans, four-coordinate structure is consistent for Pd(DPH)2Cl2. For [Pd(DPH)2Cl]ClO4, however, one DPH ligand is chelating through the phosphorus and terminal nitrogen atoms, while the second ligand is unidentate; the compound is a monomeric uni–univalent electrolyte in nitrobenzene. The ligand DPS appears to chelate via the sulfur and central nitrogen atoms, giving four-membered ring structures; a cis configuration is suggested for Pd(DPS)Cl2. Zn(DMH)2Cl2 is monomeric in solution, with the Me2N group coordinated to the metal.

Low frequency infrared and Raman spectra of the N,N,N′,N′-tetramethyl-ethylenediamine adducts of the Group IIb dihalides

1970 ◽  
Vol 48 (1) ◽  
pp. 181-184 ◽  
Author(s):  
M. H. Abraham ◽  
F. W. Parrett
Keyword(s):  
Solid State ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Low Frequency ◽  
Infrared And Raman Spectra ◽  
Cadmium Complexes ◽  
Mercury Complexes ◽  
Vibrational Bands

A study of the low frequency vibrational spectra of the complexes MX2.TMED (where M = Zn, Cd, Hg; X = Cl, Br, I; TMED = N,N,N′,N′-tetramethylethylenediamine suggests that in the solid state the zinc and mercury complexes are 4-coordinated but the cadmium complexes are all based on octahedral halogen bridged structures. Assignments of the vibrational bands are discussed.

The decomposition mechanism of new solid-state 4(5)-aminoimidazole-5(4)-carboxamide coordination compounds

2004 ◽  
Vol 409 (2) ◽  
pp. 145-150 ◽  
Author(s):  
S. Materazzi ◽  
S. Aquili ◽  
C. Bianchetti ◽  
G. D’Ascenzo ◽  
K.M. Kadish ◽  
...  
Keyword(s):  
Solid State ◽  
Coordination Compounds ◽  
Decomposition Mechanism

Coordination compounds of substituted 1,10-Phenanthrolines and related dipyridyls. VII. Complexes of copper(I) and 4,6,4',6'-Tetramethyl-2,2'-bipyridine

1965 ◽  
Vol 18 (9) ◽  
pp. 1339 ◽  
Author(s):  
JR Hall ◽  
MR Litzow ◽  
RA Plowman
Keyword(s):  
Solid State ◽  
Physical Properties ◽  
Copper Atom ◽  
Coordination Compounds ◽  
Donor Nitrogen ◽  
Partial Dissociation

A number of diamagnetic complexes of copper(I) and 4,6,4',6'-tetramethyl-2,2'-bipyridine (tmb) have been prepared and some physical properties measured. The complexes of formula Cu(tmb)2X where X = NO3, ClO4, Br, and I behave as 1 : 1 electrolytes in nitrobenzene and nitromethane, while the complex Cu(tmb)2Cl,H2O apparently undergoes partial dissociation in these solvents. All are expected to have a tetrahedral arrangement of the four donor nitrogen atoms about the copper atom. The mono complexes CuXtmb, where X = Cl, Br, and I, appear to be dimeric in the solid state with halogen bridging, but in solution the chloro and bromo complexes rearrange to varying degrees depending on the solvent, forming the salt-type compounds [Cu(tmb)2][CuX2]. CuItmb is insoluble in all common solvents.

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