Triclinic Space Group Research Articles

A Solid in Disguise: Structure Determinations, Polymorphism, and Thermal Behavior of the Silyborane pinB‐SiMe2Ph

The silylborane pinB‐SiMe2Ph (1) [pin = (OC(Me)2C(Me)2O)], an established reagent in various silylation and borylation reactions, was studied in detail with respect to its solid‐state structure. In contrast to the common understanding, 1 is a solid at ambient temperature. However, crystallization is strongly hampered and not observed above –18 °C. Single crystal X‐ray diffraction studies on 1 furnish two distinct structurally complex polymorphs. Polymorph 1A crystallizes in a triclinic space group, P1, with two pairs of independent molecules in the asymmetric unit (Z = 8, Z′ = 4). The second polymorph, 1B, in an orthorhombic space group Fdd2 comprises three independent molecules (Z = 48, Z′ = 3). Within both polymorphs as well as between the polymorphs the individual molecules of 1 exhibit only subtle conformational differences, with respect to the orientation of the Bpin and the phenyl group.

Near-Infrared Ratiometric Luminescent Thermometer Based on a New Lanthanide Silicate.

A new lanthanide silicate system, Na2 K[Ln3 Si6 O18 ] (Ln=Lu, Yb/ Er, Lu/Eu, or Lu/Yb/Er), comprising microcrystals embedded in an amorphous siliceous matrix, obtained by sintering at 1373 K a Na3 K[Ln2 Si6 O17 ]⋅3 H2 O nano-crystalline precursor, is reported. The crystal structure of these lanthanide silicates was solved from high-resolution synchrotron power X-ray diffraction data collected at 110 K, and further supported by 29 Si MAS NMR and Eu3+ luminescence. The materials crystallize in the Pī triclinic centrosymmetric space group, exhibiting a dense framework consisting of hexameric [Si6 O18 ]12- cyclosilicate units, and chains of two distinct {LnO6 } octahedra. Na2 K[(Lu0.75 Yb0.20 Er0.05 )3 Si6 O18 ] is the first example of a lanthanide silicate operative as a near-infrared ratiometric luminescent thermometer, with good sensitivity at cryogenic temperatures (<100 K). Upon excitation at 903 nm, the ratio between the 2 F7/2 →2 F5/2 (Yb3+ ) and 4 I13/2 →4 I15/2 (Er3+ ) emissions was used for sensing temperature in the 12-450 K range, reaching a maximum thermal sensitivity of 2.6 % K-1 at 26.8 K.

New triclinic polymorph of l-histidinium 5-nitrouracilate

A new form of l-histidinium 5-nitrouracilate has been obtained. It crystallizes in the triclinic space group P1, with two formula units in the unit cell, as opposed to the previously reported monoclinic polymorph. The 5-nitrouracilate anions form a dimer linked with double NH⋯O type hydrogen bonds. The infrared and Raman spectra of the new triclinic and previously obtained monoclinic forms have been registered and discussed.

K3Bi2Cl5O2(SO4)2: A Novel Pentanary Chloride Oxide Sulfate

AbstractReported are the synthesis, crystal structure and electronic structure of K3Bi2Cl5O2(SO4)2, which is a novel pentanary chloride oxide sulfate containing three types of anions, Cl–, O2–, and (SO4)2– by using a solution method. It crystallizes in the triclinic space group P , and the structure features layers built by (BiO5Cl3)8– anionic units and (SO4)2– tetrahedra with K+ ions insertion between layers as counter ions. The band gap of K3Bi2Cl5O2(SO4)2 was determined to be 3.62(2) eV and its electronic structure was also investigated to compare with the experimental results.

Structure and Optical Properties of Plane-Type And Z-Type Topology Triazole Quinoxaline Cd(II) Complexes

Two coordination polymers are obtained by self-assembly reactions of Cd2+ with 2,3-bis((1H-1,2,4-triazol-1-yl)methyl)quinoxaline (BTMQ) and terephthalic acid at room temperature. Complex 1 exhibits a two-dimensional planar structure, which crystallizes in the monoclinic space group P21/c with unit cell parameters: a = 12.752(4) A, b = 9.416(3) A, c = 16.069(5) A, α = 90, β = 102.146(5), γ = 90°, V = 1886.4(10) A3, Z = 2. Complex 2 shows a Z-type two-dimensional network structure, and crystallizes in the triclinic space group P-1 with unit cell parameters: a = 6.917(4) A, b = 10.338(5) A, c = 16.156(8) A, α = 96.889(7), β = 93.421(8), γ = 96.161(7)°, V = 1137.2(10) A3, Z = 1. Fluorescence spectral studies of BTMQ and the two complexes are also investigated, and the results show that the fluorescence intensity of complex 1 is stronger than that of the ligand, but the fluorescence intensity of complex 2 is weaker than that of the ligand.

Ferrocenylmethyl-functionalized 5-membered heterocycles: Synthesis, solid-state structure and electrochemical investigations

Treatment of Fe(η5-C5H4CH2OH)2 (1) with two equivalents of ClC(O)R (2) (a, R = 2-cC4H3O; b, R = 2-cC4H3S; c, R = 2-cC4H3Se; d, R = 3-cC4H3S) produced the corresponding ferrocenylmethyl carboxylates Fe(η5-C5H4CH2OC(O)R)2 (3a–d), while the reaction of FcCH2OLi (Fc = Fe(η5-C5H5)(η5-C5H4)) with 2,5-(ClC(O))2-cC4H2X (5) (a, X = O; b, X = S; c, X = Se) in a 2:1 molar ratio gave 2,5-(FcCH2OC(O))2-cC4H2X (6a–c). Compounds 3a–d and 6a–c were characterized by elemental analysis, NMR (1H and 13C{1H}) and IR spectroscopy. The molecular structures of 3a,b,d in the solid state were determined by single crystal X-ray structure analysis. Compound 3a crystallizes in the monoclinic space group P21/c, while 3b,d crystallize in the triclinic space group P-1¯. The ester groups and the heteroatoms are in an anti arrangement with respect to each other. Cyclic voltammetry measurements for 3a–d and 6a–c show reversible electrochemical processes (Fc/Fc+) between 165 and 176 mV for 3a–d, and 94 and 116 mV for 6a–cb, using [NnBu4][B(C6F5)4] as the supporting electrolyte. It was found that for 3a, a somewhat higher Fc/Fc+ redox potential (E0′) is observed when compared with the more electron-rich systems 3b,c,d. The molecular electronic structures of the title compounds were additionally investigated by DFT calculations, revealing different degrees of HOMO–LUMO energy gaps within the series, due to a lowering of the LUMO energy, depending on the nature of the heterocyclic ring.

Co-crystal structure of a dinuclear (Zn-Y) and a trinuclear (Zn-Y-Zn) complexes derived from a Schiff base ligand

The present investigation describes the synthesis and structural study of a metal-zinc ligand [ZnL.H2O], which was used to generate three dimensional supramolecular complex formulated as [Y{Zn(L)(SCN)}(SCN)2].[Y{Zn(L)(SCN)}2(DMF)2].(NO3). The title compound crystallizes in the triclinic space group P-1 with the following unit cell parameters: a = 14.8987(7) Å, b = 15.6725(8) Å, c = 19.2339(10) Å, a = 94.610(4)°, β = 103.857(4)°, γ = 101.473(4)°, V = 4234.4(4) Å3, Z = 2, R1 = 0.063 and wR2 = 0.96. For this compound, the structure reveals that one heterodinuclear unit [Y{Zn(L)(SCN)}(SCN)2] is co-crystallized with a heterotrinuclear unit [Y{Zn(L)(SCN)}2(DMF)2].(NO3). In the dinuclear moiety, the organic molecule acts as a hexadentate ligand and in the trinuclear unit, it acts as a pentadentate ligand with one of the oxygen methoxy group remaining uncoordinated. In both units the coordination environment of the zinc metal can be described as distorted square pyramidal. In the dinuclear unit the Y(III) is hexacoordinated while it is octacoordinated in the trinuclear unit. The environment of the Y(III) can be described as a distorted octahedral geometry in the dinuclear and as a distorted square antiprism in the trinuclear units respectively.

The crystal and molecular structure of C.I.Pigment Yellow 155, a high performance bisacetoacetarylide disazo yellow pigment

C.I.Pigment Yellow 155 (Y 155) is an important bisacetoacetarylide disazo yellow pigment with a unique structure, which has the potential to be an alternative for benzidine yellow pigments due to its superior solvent resistance and light fastness. It is essential to investigate the crystal structure of Y 155 to understand the relationship between the structure and technical performance. Y 155 crystallizes in the triclinic P1(—) space group. The molecule exists in the bisketohydrazone form which is consistent with that of disazoacetoacetanilide pigments (Diarylide Yellows). Different from the unsubstituted analogue (BADA), Y 155 molecules are approximately planar due to stronger intramolecular hydrogen bonding. In Y 155 crystals, each molecule is interleaved in two adjacent layers above and below. The color and the technical performance are discussed in relation to its crystal structure especially involving in the role of four methyl formate groups.

Design, synthesis, characterization and photoluminescence studies of two new coordination polymers based on 4,4′-oxybis(benzoic acid) and N-donor ligand with transition metals

Two novel one dimensional coordination polymers of cobalt and copper with 4,4′-oxybis(benzoic acid) (H2OBA) and N-donor ligand-1H-imidazole (IM), [Co(OBA)(IM)2(H2O)]n (1) and {[Cu2(OBA)2(IM)3(H2O)2]·5H2O}n (2) have been prepared by single gel diffusion technique at ambient condition using sodium metasilicate. Single crystal X-ray diffraction studies reveal that both 1 and 2 belong to the triclinic space group P1¯. The grown crystals were further characterized by elemental analysis, powder X-ray diffraction studies, thermogravimetry, FT-IR and UV–visible spectral studies. The compound 2 possesses two different types of coordination environments around Cu(II) ions—Cu1 is five coordinated (distorted square pyramidal) and Cu2 is six coordinated (distorted octahedral). The two dimensional structures of both 1 and 2 formed as a result of hydrogen bonding and π–π interactions possess nanopores. Photoluminescence studies were also carried out.

Preparation and characterization of nitrogen-rich bis-1-methylimidazole1H,1′H-5,5′-bistetrazole-1,1′-diolate energetic salt

A new nitrogen-rich energetic salt of bis-1-methylimidazole 1H,1′H-5,5′-bistetrazole-1,1′-diolate salt, (1-M)2BTO, was synthesized and characterized (FT-IR, 1H NMR, 13C NMR, elemental analysis, and X-ray single-crystal diffraction). Results indicated that (1-M)2BTO crystallizes in the triclinic space group P-1. The thermal decomposition behavior of (1-M)2BTO was determined by differential scanning calorimetry (DSC) and thermogravimetric tandem infrared spectroscopy. The decomposition peak temperature of (1-M)2BTO was 530 K, which suggested that the salt is strong heat resistance. The apparent activation energies were 130.56 kJ mol−1 (Kissinger’s method) and 132.50 kJ mol−1 (Ozawa’s method), respectively. The enthalpy of formation for the salt was calculated as 917.3 kJ mol−1. The detonation velocity and detonation pressure of (1-M)2BTO were 7448 m s−1 and 20.7 GPa, respectively, using the Kamlet-Jacobs equation. Furthermore, the sensitivity test results showed that its impact sensitivity is greater than 50 J and friction sensitivity is 180 N, indicating that it has a lower sensitivity.

Synthesis, physico-chemical studies and Hirshfeld surface analysis of a first 0-D Chlorozincophosphate, (H2N(CH2)4NH(CH2)2NH3Cl)ZnCl2(HPO4)

An original zero-dimensional chloro-substituted zincophosphate monomer, (H2N(CH2)4NH(CH2)2NH3Cl)Zn(HPO4)Cl2, was isolated by the reaction of zinc chloride (Zn2+, 2Cl−) with the amine, 1-(2-aminoethyl)piperazine, H3PO4 and HCl under ambient conditions. This phase crystallizes in the triclinic space group P-1 (No. 2) with the lattice parameters a = 8.834(2), b = 8.539(3), c = 11.163(2) A, α = 93.58(2)°, β = 108.62(2)°, γ = 62.96(2)°, V = 707.3(4) A3, Z = 2, R = 0.027 and Rw = 0.037. The tri-protonited organic cations are linked to the isolated chloride ions Cl− through N–H⋯Cl and C–H⋯Cl hydrogen bonds, forming corrugated cationic layers extending parallel to (a b) plane. The inorganic framework of the title compound consists of a network of ZnO3Cl and HPO4 tetrahedral units linked by their oxygen vertices, forming isolated 4-membered rings. These anionic monomers, (Zn2P2O8Cl4H2)4−, which are held by O–H⋯O hydrogen-bonding interactions, lie between the cationic layers to maximize the electrostatic interactions and are linked to (H2N(CH2)4NH(CH2)2NH3Cl)2+cations via N–H⋯O or N–H⋯Cl hydrogen bonds, forming a 3-D supra molecular structure. Hirshfeld surface analysis, Solid state NMR, Infrared spectroscopies and DTA/TGA analysis were also performed to characterize the title compound. Solid state31P and13C MAS NMR spectroscopy results were found to be in full agreement with the XRD results.

Three solid forms of chlorantraniliprole: Structure, characterization, and phase transformation

Chlorantraniliprole is one of the most widely used broad-spectrum pesticides. This paper studied three solid forms of chlorantraniliprole, among which two novel solvates were introduced, as well as their crystal structures. Form 2 and form 3 are defined as DME solvate in the triclinic space group P‾1 (Z = 4) and pyridine solvate in the triclinic space group P‾1 (Z = 2), respectively. All of the three forms were characterized and identified by powder X-ray diffraction, thermal analysis (DSC and TG), vibrational spectroscopy (IR and Raman), electron microscopy and particle size distribution. Solid-state stability and transformation relationship of the solid forms were also investigated. Besides, the insecticidal activities of form 1 and form 2 were examined.

Complexes of Ambidentate N,O-Donor Ligands with Rhenium(I) and -(V)

The reaction of the potentially bidentate ambidentate N,O-donor ligands 3-hydroxy-2-pyridinecarboxylic acid (Hhpc) and 3-hydroxy-2-(hydroxymethyl)pyridine (Hhhp) with trans-[ReOCl3(PPh3)2] led to the isolation of the products [ReOCl(hpc)2] (1) (from acetonitrile) and [ReOCl2(hhp)(PPh3)] (2) (from ethanol) respectively. In both complexes hpc and hhp are coordinated as bidentate N,O-donor chelates, rather than as O,O-donor ligands. From the reaction of [Re(CO)5Cl] and Hhhp·HCl in ethanol the neutral complex fac-[Re(CO)3Cl(Hhhp)] (3) was obtained, with N,O-coordination of Hhhp. Complex 1 crystallizes in the monoclinic space group P21/n with a = 6.8782(3), b = 20.0647(8), c = 10.8692(4) A, β = 107.545(1)°, and Z = 4. Complex 2 crystallizes in the triclinic space group P-1 with a = 7.3523(4), b = 8.1047(5), c = 19.591(1) A, α = 91.133(2)°, β = 93.656(2)°, γ = 93.074(2)° and Z = 2. Complex 3 has monoclinic P21/c symmetry with the cell parameters a = 10.6452(5), b = 11.1372(5), c = 9.7229(5) A, β = 106.107(2)°, and Z = 4.

A planar decanuclear cobalt(II) coordination cluster

A homovalent coordination cluster, [CoII10(OH)2(bda)6(ib)6] (1), featuring a nearly planar, hexagonal {Co10} array composed of ten edge-sharing {Co3(µ3-O)} triangles, forms in a nearly quantitative reaction as solvothermal decomposition product of the heterovalent pentanuclear precursor [CoII3CoIII2(Hbda)2(bda)2(ib)6] (ib: isobutyrate; H2bda: N-butyldiethanolamine) in DMSO. 1 crystallizes in the triclinic space group P-1 (a = 7.4200(15) Å, b = 9.773 (2) Å, c = 11.601(2) Å, α = 105.38(3)°, β = 106.32(3)°, γ = 93.38(3)°). The use of the {CoII3CoIII2} precursor, in combination with autogenous pressure, was found to be crucial for the condensation process yielding 1, which cannot be obtained by analogous reactions of the ligands and CoII salts in DMSO. Magnetic ac and dc susceptibility data of 1 reveal dominant ferromagnetic exchange interactions, but no slow magnetization relaxation.

First Full Structural Characterization of Chloro Formamidinium Salts

While the synthesis of chloro formamidinium chloride has been known for over one century, no solid‐state structure of a chlorine‐substituted formamidinium compound has been reported up to now. Herein, we describe syntheses, solid‐state structures, and vibrational properties of four chloro formamidinium compounds, namely [ClC(NH2)2]Cl (1), [ClC(NH2)2](AuCl4) (2), [ClC(NH2)2]2(PdCl4) (3), and [ClC(NH2)2]2(PtCl6) (4), as determined by single‐crystal X‐ray diffraction (SCXRD). 1 and 3 crystallize in the monoclinic space group P21/c, 2 in the orthorhombic space group Pbcn, whereas 4 adopts the triclinic space group P1. By using a combination of high‐resolution time‐of‐flight neutron powder diffraction, state‐of‐the‐art DFT calculations as well as IR spectroscopy, the prior SCXRD result was fully confirmed and augmented by determining the hydrogen‐bonded molecular networks. First‐principles electronic‐structure calculations corroborate the ionic nature of these salts by showing very flat, molecular‐like bands next to the Fermi level, in addition to indirect bandgaps. This study underlines the upmost importance of complementing diffraction data by ab initio calculations, as theory‐derived anisotropic displacement parameters served as fixed numerical entries.

Physico-chemical characterization, Hirshfeld surface analysis and opto-electric properties of a new hybrid material: Tris (2-amino-5-chloropyridinium) hexachlorobismuthate(III)

One novel bismuth (III) hybrid compound with 2-amino-5-chloropyridine was prepared. The crystal was grown by slow evaporation method at room temperature. The structure was determined by single-crystal X-ray diffraction. It crystallizes in the triclinic space group P-1, with the following parameters: a = 7.5076(4) Å, b = 12.3682(6) Å, c = 15.1265(6) Å and α = 98.893(2)°, β = 95.779(2)°, γ = 106.459(2)° with Z = 2 and V = 1315.26(11) Å3. The structure was solved with a final R = 0.03 for 5983 independent reflections. The crystal arrangement consists of [BiCl6]3− anions surrounded by [C5H6ClN2]+cations. Complex hydrogen bonding interactions between [BiCl6]3- and organic cations through N(C)H⋯Cl hydrogen bonds form a three-dimensional network. The crystal packing is stabilized by Cl⋯Cl interactions. Hirshfeld surface calculations were conducted to investigate intermolecular interactions, associated 2D fingerprint plots and enrichment ratio, revealing the quantitatively relative contribution of these interactions in the crystal packing. Thermal behavior was characterized by TG-DSC showing the decomposition of the compound at 180 °C. Furthermore, Impedance spectroscopy study in the temperature range from 298 K to 443 K and in the frequency range between 5 and 13 MHz revealed that the temperature dependence of DC conductivity follows the Arrhenius law. Moreover, the frequency dependence of conductivity follows Jonscher's dynamical law. Nyquist plots (Z″ versus Z′) are well fitted to an equivalent circuit model which consists of a parallel combination of a bulk resistance Rb and constant phase elements CPE.

Crystal structure, thermal behaviour, vibrational spectroscopy and optical properties of new compounds K $$_{2}$$ 2 Ca(HAsO $$_{4}$$ 4 ) $$_{2}\cdot $$ 2 · 2H $$_{2}$$ 2 O with kröhnkite-type chain

The new kröhnkite compound called potassium calcium-bis-hydrogen arsenate dihydrate K\(_{2}\)Ca(HAsO\(_{4})_{2}\cdot \)2H\(_{2}\)O was obtained by hydrothermal method and characterized by X-ray diffraction, infrared spectroscopy, Raman scattering, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis and optical (photoluminescence and absorption) properties. It crystallizes in the triclinic space group P\(\bar{1}\) and unit cell parameters \(a = 5.971(3)\) Å, \(b =6.634(3)\) Å, \(c = 7.856(4)\) Å, \(\alpha =104.532(9)\) \(^{\circ }\), \(\beta = 105.464(9)\) \(^{\circ }\) and \(\gamma = 109.698(9)\) \(^{\circ }\). The structure of K\(_{2}\)Ca(HAsO\(_{4})_{2}\cdot \)2H\(_{2}\)O built up from this infinite, (Ca(HAsO\(_{4})_{2}\)(H\(_{2}\)O)\(_{2})^{2+}\), was oriented along an axis resulting from the association of CaO\(_{6}\) octahedra alternating with each two HAsO\(_{4}\) tetrahedra by sharing corners. Each potassium atom links two adjacent chains by three oxygen atoms of HAsO\(_{4}\) tetrahedra. TGA and DSC have shown the absence of phase transition. The existence of vibrational modes corresponding to the kröhnkite is identified by the IR and Raman spectroscopies in the frequency ranges of 400–4000 and 20–4000 cm\(^{-1}\), respectively. The photoluminescence measurement show one peak at 507 nm, which is attributed to band–band (free electron–hole transitions) and (bound electron–hole transitions) emissions within the AsO\(_{4}\) inorganic part.

A rare positively charged nicotinic acid di-sulfide: 2,2'-di-thio-dinicotinic acid hydro-chloride monohydrate.

The title compound {systematic name: 3-carb-oxy-2-[2-(3-carb-oxy-pyridin-2-yl)disulfan-1-yl)]pyridin-1-ium chloride monohydrate}, C12H9N2O4S2+·Cl-·H2O, crystallizes in the triclinic space group P . A pair of 2-mercaptonicotinic acid moieties is connected by a 2,2'-di-sulfide bond with a dihedral angle of 78.79 (3)°. One of the N atom is protonated, as are both carboxyl-ate groups, resulting in an overall +1 charge on the dimer. The structure comprises a zigzagging layer of the dimerized di-thio-dinicotinic acid rings, with charge-balancing chloride ions and water mol-ecules between the layers. Hydrogen bonding between the chloride and water sites with the dimer appears to hold the structure together. Nearest neighbor nicotinic acid rings are offset when viewed down the a axis, suggesting no added stability from ring stacking. The asymmetric unit corresponds to the empirical formula of the compound, and it packs with two formula units per unit cell.

Highly sensitive bifunctional sensor of a dinuclear terbium complex

A new dinuclear terbium complex (Tb-complex) is designed and synthesized based on 2,4,5-Trifluoro-3-methoxybenzoic acid (HTFMBA). The exact structure of the Tb-complex is determined to be [Tb2(TFMBA)6(phen)2] (phen = phenanthroline). It crystallizes in the triclinic space group P-1, and it is further characterized by FT-IR, PXRD, EA, TGA and luminescence. Tb-complex shows very high luminescence quantum yield (QY) of 61.5%. Detailed investigation reveals that the Tb-complex is a highly sensitive and selective bifunctional sensor for detecting SO42− and CH3Hg+. Responsive behavior shows the detection has excellent linear relationship between luminescence and the concentration of SO42− and CH3Hg+. The limit of detection (LOD) for detecting SO42− and CH3Hg+ are as low as 5 × 10−7 M and 2.8 × 10−9 M, respectively. This is the first bifunctional sensor that could probe the highly toxic CH3Hg+, and it is the most sensitive chemosensor for detecting CH3Hg+. Further investigation also reveal that the Tb-complex is applicable in sensing SO42− and highly toxic CH3Hg+ in real water samples.

Crystal structures of two new six-coordinate iron(III) complexes with 1,2-bis(diphenyl-phosphane) ligands.

Structural characterization of the ionic complexes [FeCl2(C26H22P2)2][FeCl4]·0.59CH2Cl2 or [(dppen)2FeCl2][FeCl4]·0.59CH2Cl2 (dppen = cis-1,2-bis-(di-phenyl-phosphane)ethyl-ene, P2C26H22) and [FeCl2(C30H24P2)2][FeCl4]·CH2Cl2 or [(dpbz)2FeCl2][FeCl4]·CH2Cl2 (dpbz = 1,2-bis-(di-phenyl-phosphane)benzene, P2C30H24) demonstrates trans coordination of two bidentate phosphane ligands (bis-phosphanes) to a single iron(III) center, resulting in six-coordinate cationic complexes that are balanced in charge by tetra-chlorido-ferrate(III) monoanions. The trans bis-phosphane coordination is consistent will all previously reported mol-ecular structures of six coordinate iron(III) complex cations with a (PP)2X2 (X = halido) donor set. The complex with dppen crystallizes in the centrosymmetric space group C2/c as a partial-occupancy [0.592 (4)] di-chloro-methane solvate, while the dpbz-ligated complex crystallizes in the triclinic space group P1 as a full di-chloro-methane monosolvate. Furthermore, the crystal studied of [(dpbz)2FeCl2][FeCl4]·CH2Cl2 was an inversion twin, whose component mass ratio refined to 0.76 (3):0.24 (3). Beyond a few very weak C-H⋯Cl and C-H⋯π inter-actions, there are no significant supra-molecular features in either structure.