Modification of supramolecular assemblies based on C4H7(CH3)Te heterocycle and cooperative participation of intermolecular I···I, Te···I, Te···O secondary bonds; C(sp3)–H···O and C(sp2)–H···O hydrogen bonds

2-Methyl-1,1-dicarboxylato-1-telluracyclopentanes C₄H₇(CH₃)Te(OCOR)₂ (R=OCO, C₆H₅, 4-NO₂C₆H₄, 3,5-(NO₂)₂C₆H₃, C₆H₅CH=CH, 4-OCH₃C₆H₄) (2–7) were synthesised from the reactions of 2-methyl-1,1-diiodo-1-telluracyclopentane (1) and corresponding silver salts and characterised by (IR &¹HNMR) spectroscopy. The structures of C₄H₇(CH₃)TeI₂ (1), C₄H₇(CH₃)Te(OCOC₆H₅)₂ (3) and C₄H₇(CH₃)Te(4-NO₂C₆H₄OCO)₂ (4) were established by single crystal X-ray diffraction studies. The structures of 1, 3 & 4 (the immediate environment about tellurium is that of distorted trigonal bipyramidal geometry with a stereochemically active electron lone pair) are described in the context of their ability to generate intermolecular I···I, Te···I, Te···O secondary bonds; C(sp³)–H···O and C(sp²)–H···O hydrogen bonds leading to the formation of polymeric, tetrameric and trimeric supramolecular assemblies. The modification of supramolecular assembly present in the precursor 1 is demonstrated and the cooperative participation of C(sp²)–H···O & C(sp³)–H···O hydrogen bonds, probably, helpful in strengthening the supramolecular assembly is discussed.

Synthesis and reactivity of para-substituted benzoylmethyltellurium(II and IV) compounds: observation of intermolecular C-H-O hydrogen bonding in the crystal structure of (p-MeOC6H4COCH2)2TeBr2

Bis(p-substituted benzoylmethyl)tellurium dibromides, (p-YC₆H₄COCH₂)₂TeBr₂, (Y=H (1a), Me (1b), MeO (1c)) can be prepared either by direct insertion of elemental Te across C_Rf-Br bonds (where C_Rf refers to α-carbon of a functionalized organic moiety) or by the oxidative addition of bromine to (p-YC₆H₄COCH₂)₂Te (Y=H (2a), Me (2b), MeO (2c)). Bis(p-substituted benzoylmethyl)tellurium dichlorides, (p-YC₆H₄COCH₂)₂TeCl₂ (Y=H (3a), Me (3b), MeO (3c)), are prepared by the reaction of the bis(p-substituted benzoylmethyl)tellurides 2a-c with SO₂Cl₂, whereas the corresponding diiodides (p-YC₆H₄COCH₂)₂TeI₂ (Y=H (4a), Me (4b), MeO (4c)) can be obtained by the metathetical reaction of 1a-c with KI, or alternatively, by the oxidative addition of iodine to 2a-c. The reaction of 2a-c with allyl bromide affords the diorganotellurium dibromides 1a-c, rather than the expected triorganotelluronium bromides. Compounds 1-4 were characterized by elemental analyses, IR spectroscopy, ¹H, ¹³C and ¹²⁵Te NMR spectroscopy (solution and solid-state) and in case of 1c also by X-ray crystallography. (p-MeOC₆H₄COCH₂)₂TeBr₂ (1c) provides, a rare example, among organotellurium compounds, of a supramolecular architecture, where C-H-O hydrogen bonds appear to be the non-covalent intermolecular associative force that dominates the crystal packing.     

Secondary bonding in functionalized organotellurium compounds: preparation and structural characterization of bis(acetamido)tellurium(IV) diiodide and bis(4-methylbenzoylmethyl)tellurium(II)

Elemental tellurium inserts, under mild conditions, between C-I bond of iodoacetamide to afford bis(acetamido)tellurium(IV) diiodide (NH₂COCH₂)₂TeI₂, 1. Heating of N-bromomethylphthalimide with activated tellurium powder however, resulted in the formation of bis(phthalimido)methane, 2, instead of the expected product bis(phthalimidomethyl)tellurium(IV) dibromide. The IR spectrum of 1 is indicative of intramolecular Te?OC interaction which is also substantiated by its single-crystal structure. The compound with planar small-bite chelating organic ligands acquires butterfly shape that imparts almost perfect C_2v molecular symmetry but unlike other organotellurium(IV) iodides, the solid state structure of 1 is devoid of any intermolecular Te?I or I?I secondary interactions owing to the presence of intramolecular Te?O secondary bonds as well as intermolecular N-H?O, N-H?I and C-H?I hydrogen bonds. Bis(4-methylbenzoylmethyl)telluride (4-MeC₆H₄COCH₂)₂Te, 3b, prepared by the reduction of the corresponding dibromide, is the first structurally characterized acyclic dialkyltelluride and interestingly, does not involve intramolecular Te?OC interaction invariably present in the parent dihalides (4-YC₆H₄COCH₂)₂TeX₂ (Y = H, X = I 4a; Y = H, X = Br 5a; Y = MeO, X = Br 5c). Weak intermolecular Te?Te and C-H?O hydrogen bonds appear to be the non covalent intermolecular associative forces that dominate its crystal packing in the solid state of this Te(II) derivative. The dialkyltellurides (4-YC₆H₄COCH₂)₂Te, (Y = H, 3a, Me, 3b) undergo oxidation in presence of (SCN)₂ to give the corresponding bis(isothiocyanato)tellurium(IV) derivatives and form 2:1 adducts with Pt(II) and Pd(II) chlorides.     

Kristallstrukturen von Säurehydraten und Oxoniumsalzen. XVI Zur Kenntnis der Verbindung H2TeI6 · 8 H2O

Crystal Structures of Acid Hydrates and Oxonium Salts. XVI. On the Compound H₂TeI₆ · 8 H₂O Crystals of H₂TeI₆ · 8H₂O are obtained as dark-brown needles with a metallic lustre in incident light from solutions of tellurium iodides in concentrated hydroiodic acid on cooling. Under standard conditions the phase is stable only in contact with its saturated solution; decomposition by formation of HI, H₂O, and TeI₄ takes place in vacuo. H₂TeI₆ · 8 H₂O is orthorhombic, space group Pnnm, Z = 2, with a = 12.672(15) Å, b = 10.825(14) Å, c = 8.322(8) Å. Structurally, the compound is to be described as bis(diaquooxonium)-hexaiodotellurate dihydrate, (H₇O⁺₃)₂[TeI^2?₆] · 2 H₂O. Isolated TeI^2?₆ octahedra are surrounded by a water structure which consists of disordered chains of hydrogen-bonded H₂O and H₇O⁺₃ species.     

Twinning by merohedry in bis(4‐methoxyphenyl)tellurium(IV) diiodide dimethyl sulfoxide hemisolvate

Green crystals of the title compound, C₁₄H₁₄I₂O₂Te·0.5C₂H₆OS, space group P3₂, show twinning by merohedry (class II). The asymmetric unit contains two organotellurium molecules and one dimethyl sulfoxide (DMSO) molecule. The crystal structure displays secondary Te...I and Te...O(DMSO) bonds that lead to [(4‐MeOC₆H₄)₂TeI₂]₂·DMSO supramolecular units in which the two independent organotellurium molecules are bridged by the DMSO O atom. In addition to these secondary bonds, I...I interactions link translationally equivalent organotellurium molecules to form nearly linear ...I—Te—I...I—Te—I... chains. These chains are crosslinked, forming two‐dimensional arrays parallel to (001). The crystal packing consists of a stacking of these sheets, which are related by the 3₂ axis. This study describes an unusual dimeric arrangement of X—Te—X groups.     

Supramolecular Assembling through Anionic Iodine Secondary Bonds: Synthesis and X‐ray Characterization of (Et4N)[PhTeI4] and (Et4N)[(β‐Naphthyl)TeI4]

[PhTe]₂ and [(β‐naphthyl)Te]₂ react with iodine and tetraethylammonium iodide in toluene/methanol to give (Et₄N)[PhTeI₄] and (Et₄N)[(β‐Naphthyl)TeI₄]. The complexes were analysed by single crystal X‐ray diffraction affording the centrosymmetric monoclinic space group P2₁/c. In the novel compounds only anionic interactions of the types Te···I and I···I take place, cation‐anion effective contacts do not occur. Both anions [PhTeI₄] and [(β‐naphthyl)TeI₄] exhibit square pyramidal coordination at tellurium, with the iodine atoms in the basal positions and the organic groups apical. The tellurium centers achieve an octahedral coordination in the whole lattices through Te···I secondary bonds with the adjacent ionic species. Only the Te–I‐ and I–I‐secondary bonds behave as structure‐forming interactions in the self‐organization of the supramolecular anionic gatherings. New evidences show that for organyltellurates (Q)[PhTeX₄] (Q = protonated amines, amides or amino acids; X = Cl, Br, I), NH···X hydrogen bondings are able to hinder the anionic halogen‐halogen secondary interactions. In case of the more frequent I···I interactions, they have been observed only in the absence of NH···I hydrogen bonds.     

Synthesis and Crystal Structure of Tellurium(II) bis(2‐methoxycarbonylethanethiolate): A Novel Coordination Mode of Tellurium

The tellurium(II) dithiolates Te[SCH₂CH₂C(O)OCH₃]₂, ( 1 ), Te[SCH₂CH₂CH₂SC(O)CH₃]₂, ( 2 ), and Te[SCH₂CH₂CH₂CH₂SC(O)CH₃]₂, ( 3 ) were synthesized from Te(S^tBu)₂ and the corresponding thiol. All compounds are sensitive toward higher temperatures and light and decompose to elemental tellurium and the disulfide. In the solid state, the Te atom of 1 exhibits the novel Te(S₂Te₂) coordination mode. Additionally to the two Te—S bonds, each Te atom forms two long Te···Te contacts to neighboring molecules, leading to a coordination number of four and a distorted sawhorse configuration. No intramolecular Te···O interactions are present in the solid state, in accordance with ab initio calculations (MP2/ecp‐basis) for the isolated molecule. ¹²⁵Te NMR shifts of all compounds lay within a narrow range and close to the respective shift of other Te(SCH₂R)₂ compounds. VT ¹²⁵Te NMR spectra gave no hint to donor acceptor interactions in solution for any of the compounds and thus corroborate results from IR‐spectroscopy, ab initio geometry optimizations, and thermochemical calculations.     

2,4,6-Triphenylphenyltellurium(IV) triiodide - supramolecular self-assembling in organotellurium triiodides

2,4,6-Triphenylphenyltellurium(IV) triiodide, (2,4,6-Ph₃C₆H₂)TeI₃, can be obtained by the reaction of the corresponding ditelluride {(2,4,6-Ph₃C₆H₂)Te}₂ with iodine under an atmosphere of dry nitrogen in toluene. The apparent bisphenoidal coordination sphere of the central tellurium atom is extended by the presence of intermolecular Te?I and I?I secondary bonds which form chains along the crystallographic a axis. Weak intramolecular interactions with one of the phenyl rings of the (2,4,6-Ph₃C₆H₅) unit completes the pseudo-octahedral coordination geometry around each tellurium atom. A comparison of the structure of (2,4,6-Ph₃C₆H₂)TeI₃ with the bonding situations in other organotellurium(IV) triiodides suggests a strong dependence of the formation of supramolecular assemblies on the nature of the organic substituents.     

Furan derivatives of tellurium: Synthesis and structural comparison with the thiophene analogues

α-Bromo-2-acetylfuran adds oxidatively to elemental tellurium and aryltellurium(II) bromide at ambient temperature to afford (2-furoylmethyl)tellurium(IV) dibromides, (FuCOCH₂)₂TeBr₂ (1b) and Ar(FuCOCH₂)TeBr₂ (Fu = 2-C₄H₃O; Ar = 1-C₁₀H₇, 2b; 2,4,6-Me₃C₆H₂, 3b). The iodo analogues 1c-3c can be obtained by metathesis of the bromides with an alkali iodide. Condensation reactions of the parent methyl ketone with Te(IV) chlorides results in the corresponding chloro analogues, (FuCOCH₂)₂TeCl₂ (1a) and Ar(FuCOCH₂)TeCl₂ (2a, 3a and Ar = 4-MeOC₆H₄ (4a)). These diorganotellurium dihalides are reduced with aqueous bisulfite to diorganotellurides 1-3, which can be oxidized readily with dihalogens to the desired diorganotellurium(IV) dihalides. The tellurated furan derivative, bis(2-furyl)tellurium(II), Fu₂Te (5), obtained by detelluration of bis(2-furyl)ditelluride with electrolytic copper, gives crystalline bis(2-furyl)tellurium(IV) dichloride (5a) upon chlorination. Crystal structures of Te(IV) compounds 1a, 1b, 2a-4a, and the telluride 3 together with its thiophene analogue (2,4,6-Me₃C₆H₂)((2-C₄H₃S)COCH₂)Te, 6 have been studied. Among the Te(IV) compounds, the functionalized organic moiety, FuCOCH₂-, behaves as a (C, O) chelating ligand, resulting in a intramolecular 1,4-Te?O secondary bonding interaction. Such an interaction is absent in Te(II) compounds 3 and 6, though they differ in the conformation adopted by the organic ligand. The chalcogen atoms in the heteroaroyl moiety are trans in 3 but cis in 6 which also possesses intermolecular Te?O interaction in its lattice.     

Structures of Iodophenyltellurium(II) and Diiododi-(β-naphtyl)tellurium(IV)

The reactions between diphenyl ditelluride, (PhTe)₂, or di(β-naphtyl)ditelluride, (β-naphtylTe)₂, with equivalent amounts of iodine have been reinvestigated and the crystal and molecular structures of iodophenyltellurium(II), (PhTeI)₄, and diiododi-(β-naphtyl)tellurium(IV), (β-naphtyl)₂TeI₂, have been determined. The structure of iodophenyltellurium(II) (space group Cc, a = 13.850(5) Å, b = 13.852(3) Å, c = 16.494(6) Å and β = 101.69(2)°, Z = 4) is built up by four PhTeI units which are linked by weak Te–Te interactions with Te–Te distances between 3.152(5) Å and 3.182(4) Å. The angles between the tellurium atoms are approximately 90° giving an almost perfect square. Long range secondary bonds (Te–I: about 4.2 Å) link the tetrameric units to give an infinite two-dimensional network. Iodo(β-naphtyl)tellurium(II) is less stable than the phenyl derivative. Solutions of this compound decompose under formation of elemental tellurium and (β-naphtyl)₂TeI₂. (β-Naphtyl)₂TeI₂ crystallises in the monoclinic space group C 2/c (a = 21.198(6) Å, b = 5.8921(8) Å, c = 16.651(5) Å, β = 114.77(2)°). The tellurium atom is situated on a two-fold crystallographic axis and Te–I and Te–C bond lengths of 2.899(1) and 2.108(7) Å have been determined.     

Carbon Dioxide Fixation with Dialkyltellurium(IV) Dihydroxides

Aqueous solutions of Me₂Te(OH)₂ and (CH₂)₄Te(OH)₂ readily absorb carbon dioxide giving rise to the formation of the dialkyltelluroxane carbonates (Me₂TeOTeMe₂CO₃)_n ( 1 ) and HO(CH₂)₄TeOTe(CH₂)₄CO₃Te(CH₂)₄OH·2H₂O ( 2 ·2H₂O), which were characterised by ¹³C MAS and ¹²⁵Te MAS NMR spectroscopy as well as X‐ray crystallography. The spatial arrangement of the tellurium atoms is defined by C₂O₂ donor sets in the primary coordination sphere and one or two secondary Te···O contacts, which involve coordination of the carbonate moieties. In turn, the different Te–O coordination modes render a lack of symmetry to the carbonate moieties, which show significantly different C–O bond lengths, an important feature when contemplating the C–O bond activation in carbonates. The structural and spectroscopic parameters of 1 and 2 are discussed in comparison with other heavy p‐block element carbonates. In solution, electrolytic dissociation of 1 and 2 takes place.     

Synthesis and polycondensation of some new organotellurium compounds containing hydroxymethyl groups

A new series of organotellurium compounds [i.e. 2‐HOCH₂C₆H₄TeBr₃ (1), (2‐HOCH₂C₆H₄)₂TeBr₂ (2), (2‐HOCH₂C₆H₄)₂Te (3), (2‐HOCH₂C₆H₄Te? )₂ (4), 4‐HOCH₂C₆H₄TeBr₃ (5), (4‐HOCH₂C₆H₄)₂TeBr₂ (6), (4‐HOCH₂C₆H₄)₂Te (7), and (4‐HOCH₂C₆H₄Te? )₂ (8)] were prepared by reacting hydroxymethylphenylmercury chlorides with tellurium tetrabromide in dry dioxane. Bis(2‐hydroxymethylphenyl) telluride (3), bis(2‐hydroxymethylphenyl) ditelluride (4) and bis(4‐hydroxymethylphenyl) telluride (7) were polymerized by a solution polycondensation technique with toluene diisocyanate and terephthaloyl chloride, leading to new organic tellurium polyurethanes and polyesters. All the new compounds were characterized by elemental analysis and spectroscopic data. Copyright © 2002 John Wiley & Sons, Ltd.     

Studies of diorganotellurium diisothiocyanates and of a triorganotellurium isothiocyanate in the solid state and in solution

The synthesis of the first diorganotellurium dithiocyanates is reported. It is argued that the tellurium interacts more strongly with the nitrogen than with the sulphur atom of the NCS group. Two structural classes are noted: (a) R₂Te(NCS)₂ (R  Ph, p-CH₃O · C₆H₄) in which interaction of tellurium with the two NCS groups is equal and in which intermolecular association via long TeS bonds probably occurs; (b) [R₂Te(NCS)](NCS) (R  p-C₂H₅O · C₆H₄) in which the tellurium interacts unequally with the two NCS groups to give a structure with some “telluronium salt” character.The chemistry of MePh₂Te(NCS) is studied. In solvents of reasonable polarity (e.g. DMSO), and probably in the solid state, it behaves as an essentially ionic telluronium salt [MePh₂Te](NCS). However, in CDCl₃ solution it exists in a covalent form, MePh₂Te(NCS), from which reductive elimination of, exclusively, methyl thiocyanate occurs. The mechanism of the decomposition is not simple: initially it is probable that a free radical pathway dominates, but after approximately 100 min the rate of decomposition increases. There is evidence that the second rate process is catalysed by diphenyltelluride. Other salts, [MePh₂Te]X (X  BF₄, PF₆) are reported for comparison.     

Dimerization of New T‐shaped Hypervalent Organotellurium(II) Dihalides: Synthesis and Structural Characterization of (PyH)[mesTeIX] (Py = pyridine; mes = mesityl; X = Cl,Br, I)

[mesTe]₂ reacts with iodine in toluene and further with (C₅H₆N)⁺X^? (X = I, Br, Cl) to give (PyH)[mesTeI₂] ( 1 ), (PyH)[mesTeIBr] ( 2 ) and (PyH)[mesTeICl] ( 3 ). The anionic fragments [(mes)TeI₂] and [(mes)TeIBr] of 1 and 2 are assembled as dimers by reciprocal, secondary Te···X interactions, linked also to the pyridinium cations through μ‐NH···X bonding. The anion [(mes)TeICl]^? ( 3 ) do not interact with neighboring anionic moieties, achieving also secondary NH···Cl bonding toward the pyridinium cation. The dimerization ability – with attaining of additional interionic hydrogen bridges – of 1 and 2 allow them to be viewed as partially “molecular” and as hypervalent compounds of Te^II, for which the observed linearity of the I–Te–X system and the similarity of the Te–X bond distances are expected.     

The Photooxidation of Bis(8‐dimethylaminonaphthyl) Ditelluride

The photooxidation of (8‐Me₂NC₁₀H₆Te)₂ provided a complex reaction mixture from which the novel tetranuclear telluroxane cluster (8‐MeNC₁₀H₅TeO)₄ ( 1 ) was isolated in 17 % yield. Compound 1 contains two 5,5′‐binaphthyl moieties that presumably formed by oxidation of C5–H bonds of the naphthyl ring. Upon formation of 1 , one of the two methyl groups of the 8‐dimethylamino group was cleaved and the remaining coordinative Te···N bond turned into a covalent Te–N bond. In the solid‐state, individual molecules of 1 are associated through secondary Te···O interactions giving rise to a 1D coordination polymer.     

Perfluoralkyltellur-Verbindungen: Oxidation von (CF3)2Te Darstellungen und Eigenschaften von (CF3)2TeCl2, (CF3)2TeBr2, (CF3)2Te(ONO2)2 und (CF3)2TeO [1]

Perfluorosalkyl Tellurium Compounds: Oxidation of (CF₃)₂Te; Preparations and Properties of (CF₃)₂TeCl₂, (CF₃)₂TeBr₂, (CF₃)₂Te(ONO₂)₂, and (CF₃)₂TeO From the oxidation of (CF₃)₂Te with Cl₂, Br₂, O₂, and ClONO₂ the new trifluoromethyl tellurium compounds (CF₃)₂TeCl₂, (CF₃)₂TeBr₂, (CF₃)₂TeO, and (CF₃)₂Te(ONO₂)₂ are prepared. The ¹⁹F, ¹³C and ¹²⁵Te n.m.r. spectra, the vibrational and mass spectra as well as the chemical properties of these compounds are described. By variation of the reaction conditions CF₃TeCl₃ and CF₃TeBr₃ are also formed. It has not been possible to isolate (CF₃)₂TeI₂, but there is some evidence that it is formed as an intermediate. (CF₃)₂Te reacts with ozone to a very unstable compound, which decomposes at low temperature.     

C(sp)H?O and C(sp)H?O hydrogen bonds in acyclic- and cyclic-organotellurium carboxylates

The reactions between R₂TeI₂ (R₂=(CH₃)₂, C₄H₈, C₅H₁₀) and AgOCOR′ (R′=C₆H₅, 4-NO₂C₆H₄, CHCHC₆H₅) (molar ratio 1:2) yield diorganotellurium dicarboxylates: (CH₃)₂Te(OCOC₆H₅)₂ (1), C₅H₁₀ Te(OCOC₆H₅)₂ (2), C₄H₈Te(OCO4-NO₂C₆H₄)₂ (3) and C₄H₈Te(OCOCHCHC₆H₅)₂ (4). They are characterized by IR, (¹H, ¹³C, ¹²⁵Te) solution NMR; (¹³C, ¹²⁵Te) solid state NMR spectroscopy. The X-ray structures of 1-4 (the immediate environment about tellurium is that of distorted trigonal bipyramidal geometry with a stereochemically active electron lone pair) are described in the context of their ability to generate intermolecular CH?O hydrogen bonds, which lead to the formation of supramolecular assemblies.     

Synthesis and crystal structure of mercury(II) chloride–ferron (7-iodo-8-hydroxyquinoline-5-sulfonic acid) adduct

A mercury(II) chloride adduct of ferron (7-iodo-8-hydroxyquinoline-5-sulfonic acid), [HgCl₂ (C₉H₆INO₄)·H₂O] has been synthesized and characterized by X-ray diffraction analysis and spectroscopic studies. The compound crystallizes in P2₁/c space group, a?=?8.919(3), b?=?23.216(3), c?=?7.714(3)?Å, β?=?95.79(3)°. The coordination geometry around mercury is distorted square planar [(2+2) coordination] with two short Hg–Cl bonds [2.308(2) and 2.309(18)?Å] and two long Hg–O(sulfonate) [2.738(4)?Å] and Hg–O(water) [2.889(4)?Å] bonds. The sulfonic group is deprotonated, the proton having migrated to the quinoline N atom that forms intermolecular hydrogen bonds. The inversion related organic ligands are stacked over one another. The crystal structure is further stabilized by a C–H···O, O–H···O and N–H···O hydrogen bonds.     

A new high-spin iron(III) bis(aqua) complex with the <Emphasis Type="Italic">meso</Emphasis>-tetra(para-chlorophenyl)porphyrin: X-ray crystallography,Hirshfeld surface analysis,magnetic, EPR and electrochemical properties

Chemical preparation of the bis(aqua) iron(III) metalloporphyrin [Fe^III(TClPP)(H₂O)₂](SO₃CF₃)·2(Pnz)·3/4(C₆H₁₂)·2H₂O (TClPP?=?TClPP?=?5,10,15,20-tetra(para-chlorophenyl)porphyrinato and Pnz?=?phenazine) coordination complex (I) was made. The crystal structure of (I) was determined by X-ray single-crystal diffraction and elucidated by Hirshfeld surface approach. Magnetic, spectroscopic and electrochemical properties were also reported and discussed. The mean equatorial distance (Fe–Np) between the iron(III) atom and porphyrin nitrogen atoms is appropriate to a high-spin (S?=?5/2) iron(III) complex. The high-spin state is also confirmed by both magnetic and electron paramagnetic resonance (EPR) spectroscopy data. The repetitive building unit of the crystal structure provides [Fe^III(TClPP)(H₂O)₂]⁺ ion complexes, two non-coordinated Pnz molecules and two water molecules which are interconnected by O–H···O/N/Cl, C–H···O/F/Cl hydrogen bonds, and by C–X···π, C–H···π and π–π stacking intermolecular contacts, forming a 3D supramolecular network. The role and nature of these intermolecular interactions were quantitatively analysed by 3D Hirshfeld surface analysis and associated 2D fingerprint plots. Cyclic voltammetry measurements indicate a one-electron reversible reduction wave with an E_1/2 (Fe(III)/Fe(II) half-potential value of ?0.24 V, which confirms the high-spin S?=?5/2 state of the studied complex.     

Dimethyl-tellur-bis(alkylxanthogenate)

Tellurium-Dimethyl-bis(alkylxanthates) Tellurium dimethyl-bis(alkylxanthates) of the type R₂Te(S₂COR′)₂ with R = CH₃ and R′ = CH₃, C₂H₅, i-C₃H₇ are obtained by reaction of tellurium dimethyldiiodide with freshly prepared sodium xanthates. Another preparative method is the insertion of CS₂ in tellurium dimethylbis(alkoxydes). The X-ray analysis of (CH₃)₂Te(S₂COCH₃)₂ shows, that in the crystal the molecule has a ψ-pentagonal bipyramidal configuration around tellurium.