Bimetallic Coordination Polymers Research Articles

From Coordination Polymers to Doped Rare‐Earth Oxides

AbstractA series of bimetallic coordination polymers were synthesised from lanthanide salts (chlorides or nitrates of Ce, Nd, Gd) and 2,5‐dihydroxy‐1,4‐benzoquinone (DHBQ) under aqueous and anhydrous conditions, to be used as preceramics for mixed oxide synthesis. Syntheses in water or tetrahydrofuran (THF) gave rise to two different types of metal–organic frameworks. A new polymeric species, [Gd(DHBQ)Cl(THF)2]n, was characterised by single‐crystal X‐ray diffraction {[Gd(DHBQ)Cl(THF)2]n, a = 8.643(2) Å, b = 9.917(5) Å, c = 10.422(3) Å, α = 104.611(3)°, β = 109.623(3)°, γ = 96.097(3)°, V = 796.1(5) Å3, triclinic, P$\bar {1}$, Z = 2}. Characterisation by IR and Raman spectroscopy, powder X‐ray diffraction and scanning electron microscopy showed that the mixed‐metal polymers are solid solutions and highlighted the fact that their shape and morphology are strongly influenced by the presence of water in the reaction mixture. Micrometric, well‐defined cylindrical objects were obtained from the aqueous synthesis, while the reaction in anhydrous THF led to nanometric spheres. Calcination at 850 °C of the coordination polymer preceramics easily yielded mixed NdxGd(1–x) and NdxCe(1–x) oxides as solid solutions, in which x varies between 0 and 1. The morphology of the preceramic powders is retained upon calcination. This allows easy control of some of the oxide properties from the coordination compound synthesis step. Indeed, BET measurements pointed out that the choice of anhydrous reaction conditions for the preceramic synthesis leads to enhancement of the specific surface areas of the oxides by one order of magnitude.

Solvethermal synthesis of mono- and bi-metallic flower-like infinite coordination polymer and formation mechanism

Abstract The mono- and bi-metallic flower-like infinite coordination polymer were synthesized by simple coordination-modulation method using sodium acetate as capping agent. The structure was characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Based on a series of comparative experimental results, we have deduced that the possible formation mechanism of these Dy-flower-like microspheres via a three-step process.

New Organotin/CuCN/Quinazoline 3D-Supramolecular Coordination Polymers Having Catalytic and Luminescence Activities

The new bimetallic supramolecular coordination polymers (SCP); 3 ∞[Cu(CN)2·Me3Sn·qaz], 1 and 3 ∞[Cu2(CN)4·(Ph3Sn)2·qaz], 2 (qaz = quinazoline), are prepared in water/acetonitrile solvent at room temperature. The structure of 1 consists of the anionic Cu(CN)2 building blocks connected by the Me3Sn cations to form zigzag chains which are bridged by qaz creating 2D-sheets. The interwoven infinite sheets are arranged in parallel A···A···A fashion developing 3D-network structure via H-bonds, π–π stacking, and Cu–C contacts. The network structure of 2 exhibits two different copper sites forming two Cu(CN)2 building blocks which are connected by the Ph3Sn groups constructing elongated corrugated chains. The qaz ligand connects these chains forming 3D-network structure containing the rhombic [Cu2(μ3-CN)2] motif. 1 and 2 are luminescent materials which can be used in applications as molecular sensing systems. Also, the catalytic activity of 1 and 2 was investigated towards the degradation of Metanil Yellow (MY) dye by dilute solution of hydrogen peroxide as oxidant.

Observation of Long-Range Vicinal Effect in Chiral Cu(II)-Cr(VI) or Cu(II)-W(VI) Bimetallic Coordination Polymers

We have prepared some diastereomers of [CuL2][M2O7] (L is 1,2-diaminocyclohexane and its derivatives; M = Cr and W) bimetallic coordination polymers and confirmed their structural similarity and inner electronic states by means of XRD and XAS, respectively. For the first time, we have successfully observed distant vicinal effect of which the chiral source is only chiral organic ligands of [CuL2]2+ moieties (acting as ligand complex), while probe bands for solid state CD spectra are charge transfer (CT) bands of [M2O7]2− moieties (achiral complex) with the d0 electronic configuration. The new concept (interpretation) of this observation will be important for supramolecular chirality of coordination polymers built by ligand complexes.

Seven Coordinated Metal Complexes derived from (3-Carboxymethoxy-Naphthalen-2-yloxy)-Acetic Acid and Coordination Polymers

A design principle for seven coordinated metal carboxylate complexes and coordination polymers of Mn(II), Cd(II) and Na(I) derived from (3-carboxymethoxy-naphthalen-2-yloxy)-acetic acid (LH2) is presented. The complexes/coordination polymer [Mn(L)(H2O)3]·3H2O (1), [{Cd(L)(H2O)2}·H2O]n (2); [Cd(L)(py)3]·3H2O (3) have metal ions in pentagonal bipyramid environments (py = pyridine). The coordination polymer [{Cd(L)(H2O)2}·H2O]n (2) may be considered to be the self-assembly of hexacoordinated [Cd(L)(H2O)2] units; it reacts with pyridine to form mono-nuclear complex 3. Depending on the reaction conditions, Ni-coordination polymers of L adopt different compositions. From the reaction carried out with NiCl2 and NaOH in quinoline and water, a hetero bimetallic coordination polymer; namely, [[NaL(H2O)]2Ni(H2O)4]n (4) is obtained. A similar reaction in pyridine-water solvent led to [{Ni(L)(py)3}.py]n (5). The coordination polymer 5 has pyridine in its interstices held by C–H···π interactions.

Vapour-adsorption and chromic behaviours of luminescent coordination polymers composed of a Pt(ii)-diimine metalloligand and alkaline-earth metal ions

Four new bimetallic coordination polymers (CPs), {M[Pt(CN)(2)(5,5'-dcbpy)]·4H(2)O}(n) (M = Mg(2+), Ca(2+), Sr(2+), Ba(2+); 5,5'-H(2)dcbpy = 5,5'-dicarboxy-2,2'-bipyridine) were synthesized using four alkaline-earth metal ions and a Pt(II)-diimine metalloligand [Pt(CN)(2)(5,5'-H(2)dcbpy)]. All four CPs are isomorphous with the Zn complex, {Zn[Pt(CN)(2)(5,5'-dcbpy)]·4H(2)O}(n), which exhibits effective metallophilic interactions between Pt(II) ions. These CPs exhibited colourful thermochromic behaviour and solid-state solvatochromic-like behaviours when suspended in various solvents. Thermogravimetric analysis and vapour-adsorption measurements revealed that the CPs can reversibly adsorb water and MeOH vapours. The emission energy of the triplet metal-metal-to-ligand charge-transfer ((3)MMLCT) state varied markedly upon guest adsorption/desorption. The chromic and vapour-adsorption properties of these CPs depend strongly on the cross-linking M(2+) ions.

Spin-crossover in cyanide-based bimetallic coordination polymers—insight from first-principles calculations

Employing density functional theory (DFT) based calculations, we perform a computational investigation to unravel the intricate spin-crossover transitions that have been observed (Niel et al., Angew. Chem., Int. Ed., 2003, 42, 3760) in cyanide-based bimetallic coordination polymers, [Fe(pmd)-(H2O){M(CN)2}2]·H2O (M = Ag or Au and pmd = pyrimidine). Our calculations provide an explanation for the observed temperature-induced low-spin (LS) to high-spin (HS) spin-crossover occurring in both Ag and Au hydrated networks due to Fe–N bond stretching, concomitant with charge re-distribution from Fe to the ligands. For dehydrated compounds, we find that relativistic effects in AuversusAg lead to differences in the degree of covalent bonding, which in turn, gives rise to a differential behavior, viz. the Ag dehydrated network exhibits a LS-HS spin transition whereas the Au hydrated network remains in HS state. As a critical test of our first-principles study we propose to investigate a Cu-based bimetallic coordination polymer, which we predict to be in LS state.

Synthesis, Crystal Structures and Fluorescent Properties of Two Bimetallic Coordination Polymers

Two novel 2D and 3D bimetallic CdIINiII coordination polymers, Cd(2Mpz)(H2O)Ni(CN)4(I) (2Mpz: 2-methylpyrazine) and Cd(2Epz)(H2O)Ni(CN)4(II) (2Epz: 2-ethylpyrazine), have been synthesized and characterized by elemental analysis, powder X-ray diffraction, IR spectra, fluorescent spectra, single crystal X-ray diffraction and thermogravimetric analysis. Based on the analysis of structures, it can be found that the Cd(II) ions in the two complexes have the similar octahedral coordination geometry of CdN5O, which are linked by [Ni(CN)4]2− units at the equatorial plane to form 2D sheet layers [CdNi(CN)4]n. However, it’s noted that the coordination environment of Ni(II) ions and action of ligands are different. All the Ni(II) ions in I are the five-coordinated pentahedron configuration and 2-methylpyrazine acts as a bridging ligand linking the Cd(II) and Ni(II) ions of the adjacent layers, leading to the 3D metal–organic framework. The structure of II indicates all the Ni(II) ions are the four-coordinated square plane and 2-ethylpyrazine is a terminal ligand coordinated to Cd(II) ions, forming the 2D layer structure. Moreover, the two complexes display significant thermal stability and fluorescent properties.

A novel tricyanoruthenium(iii) building block for the construction of bimetallic coordination polymers

Reaction of excess cyanide with a ruthenium(VI) nitrido complex bearing a tridentate Schiff base ligand produces a novel tricyanoruthenium(III) complex in which nucleophilic substitution of an imine hydrogen of the Schiff base by cyanide has occurred, this complex is a useful building block for the construction of 3d-Ru(III) magnetic materials.

Spin-Crossover Behavior in Cyanide-Bridged Iron(II)−Copper(I) Bimetallic 1−3D Metal−Organic Frameworks

The synthesis and characterization of a series of 1-3D cyanide-bridged iron(II)-copper(I) bimetallic coordination polymers formulated as {Fe(3-Xpy)(2)[Cu(3-Xpy)(z)(CN)(2)](2)}, where 3-Xpy is a 3-halogenpyridine ligand with X = F (z = 1.5, 1), Cl (z = 1, 2 and 3), Br (z = 1, 4), and I (z = 1, 5), are reported. In all derivatives, the Fe(II) ion lies in pseudoctahedral [FeN(6)] sites defined by four in situ formed [Cu(3-Xpy)(z)(CN)(2)](-) bridging ligands and two 3-Xpy terminal ligands occupying the equatorial and axial positions, respectively. 1 consists of stacks of corrugated grids whose square windows are defined by pseudotrigonal and pseudotetrahedral [Cu(3-Fpy)(CN)(2)](-) and [Cu(3-Fpy)(2)(CN)(2)](-) units, respectively. 2 is a 3D coordination polymer with the topology of the open-framework CdSO(4). The [Cu(3-Clpy)(CN)(2)](-) rods connecting the pseudooctahedral Fe(II) sites are arranged in such a way that interpenetration is avoided. 3, an architectural isomer of 2, is defined by arrays of linear chains. 4 and 5 are isostructural to 3. Polymer 1 is essentially a low-spin (LS) compound with ca. 19% of residual Fe(II) ions in the high-spin (HS) state at 293 K. It undergoes an irreversible spin transition at T(c) = 356 K. Subsequent cooling-warming cycles give a new spin-crossover behavior characterized by T(c) = 187 K. The structural analysis at 130 and 293 K and at 293 K after irreversible transformation (293 K*) reveals a large unit cell volume variation of 67 A(3) per Fe atom. In addition to the volume change associated with the spin-state conversion, remarkable bond and angle modifications around the Cu(I) sites account for the high flexible nature of the crystal. 2 displays a complete not well-resolved two-step spin conversion, T(c1) = 169 K and T(c2) = 210 K, reflecting the occurrence of two distinct crystallographically Fe(II) sites. The large unit cell volume variation per Fe atom in 2, 59 A(3), has been rationalized in terms similar to those for 1. 1D polymers 3-5 are HS compounds.

Metal Complexes of Cinchonine as Chiral Building Blocks: A Strategy for the Construction of Nanotubular Architectures and Helical Coordination Polymers

The first chiral bipyridyl-type metalloligands based on aluminum derivatives of cinchonine (CN-H) were synthesized and characterized by single-crystal X-ray diffraction studies. These bischelate complexes, (CN)(2)AlX [X = Cl (1a), Me (1b)] were found to be effective building blocks for the preparation of novel helical nanotubular architectures as well as chiral bimetallic coordination polymers, as demonstrated by the rational synthesis of a helical structure formed by 1a and ZnCl(2). The applied methodology stands as an exemplary strategy for the rational synthesis of chiral metal-organic frameworks through self-organization driven by nonbonding interactions or coordination, which could potentially find applications in enantioselective separations and catalysis.

Synthesis, crystal structures, magnetic properties and fluorescent emissions of two-dimensional bimetallic coordination frameworks Fe II(3-fluoropyridine) 2[Au I(CN) 2] 2 and Mn II(3-fluoropyridine) 2[Au I(CN) 2] 2

New interesting two-dimensional (2D) bi-metallic coordination polymers {Fe II(3-fluoropyridine) 2[Au I(CN) 2] 2} n ( 1), {Mn II(3-fluoropyridine) 2[Au I(CN) 2] 2} n ( 2) were synthesized and characterized by using single-crystal X-ray analysis and IR and elemental analyses. Both complexes are isostructural to each other and construct 2D {M II[Au I(CN) 2] 2} (M = Fe, Mn) sheet network structures, including the rhombus { M 4 II [ Au I ( CN ) 2 ] 4 }, which are called Hofmann-like structure. Both structures exhibit bilayer connections via Au–Au interactions. Complex 1 which shows two-step spin transition has been already found. However, only the structure of 1 in high-spin state (293 K) was completely solved. Therefore, in this report, the high quality of crystal data of 1 in 100% low-spin state (80 K) and 50% low-spin state (123 K) are completely solved. Also magnetic property of 2 and structure of 2 at 293 K have been studied. Furthermore, we have found that both compounds show strong fluorescent emissions in the solid state at room temperature.

A 2D Coordination Polymer with Canted Ferromagnetism Constructed from Ferromagnetic [NiIICoII] Nodes

A bimetallic coordination polymer, infinity (2)[{LNi (II)Co (II)}(dca) 2], has been constructed from heterobinuclear [Ni (II)Co (II)] nodes and dicyanamido spacers [L (2-) is the dianion of the Schiff base resulting from the 2:1 condensation of 3-methoxysalicyladehyde with 1,3-propanediamine; L (2-) = N, N'-propylenebis(3-methoxysalycilideneiminato)]. The intranode Co (II)-Ni (II) interaction was found to be ferromagnetic because of the orthogonality of the magnetic orbitals. Below 12 K, the onset of the canted ferromagnetic ordering is observed.

Aromaticity in alkali metal clusters: Role of the metalloligand and the size of the metal ion

A new polydentate fac-trioxo molybdenum complex, [MoO$_{3}$L]$^{2-}$ {L=iminodiacetate} has been synthesized by the reaction of sodium molybdate and iminodiacetic acid. The dinegative complex anion acts as a ligand towards alkali metal cations, Na$^{+}$. The sodium complex, [Na$_{2}$MoO$_{3}$L(H$_{2}$O)$_{2}$]$_{n}$ (1) is a 3D hereto bimetallic coordination polymer, containing a unique hexagonal 1D sodium cluster chain. The DFT calculations on hexagonal sodium cluster show that, the (Na$_{6)$ rings in the chain are highly aromatic in character and the NICS (0) values of the Na$_{6}$ rings are almost same as their polyacene analogues. The stability and reactivity pattern of the Na$_{6}$ rings also follow the same pattern as their organic analogues. Related analysis on Li-cluster is also accomplished. A theoretical investigation based on DFT is performed to find out the possible stable structures of Li$_{6}$, Na$_{6}$, K$_{6}$, Li$_{3}$Na$_{3}$ and Na$_{3}$K$_{3}$ molecules and a common D$_{3h}$ symmetric structure is found. Also the reactions between Li$_{6}$ and Na$_{6}$ as well as Na$_{6}$ and K$_{6}$ are found to be thermodynamically favourable. Importance of the presence of the metalloligand in inducting the aromatic behaviour is highlighted.

Pressure Response of Three-Dimensional Cyanide-Bridged Bimetallic Magnets

Effects of pressure on the structures and magnetic properties of three types of 3-D cyanide-bridged bimetallic coordination polymer magnets, MnIICrIII ferrimagnet [Mn(en)]3[Cr(CN)6]2.4H2O (1; en = ethylenediamine), NiIICrIII ferromagnet [Ni(dipn)]3[Cr(CN)6]2.3H2O (2; dipn = N,N-di(3-aminopropyl)amine), and NiIIFeIII ferromagnet [Ni(dipn)]2[Ni(dipn)(H2O)][Fe(CN)6]2.11H2O (3), were systematically examined under hydrostatic pressure up to 19.8 GPa using a piston-cylinder-type pressure cell and a diamond anvil cell. The ferrimagnet 1 showed the reversible crystalline-to-amorphous-like phase change, and the magnetic phase transition temperature (TC) was reversibly changed from 69 K at 0 GPa to 126 K at 4.7 GPa. At higher pressure, the net magnetization was suppressed with increasing pressure, and the magnetic state at 19.8 GPa was assumed to be paramagnetic. The initial ferrimagnetic phase of 1 was not recovered after releasing the pressure from 19.8 GPa. The magnetic phase of 2 was reversibly converted between ferromagnetic and paramagnetic-like phase in the range 0 </= P </= 4.7 GPa while maintaining its crystallinity. The porous ferromagnet 3 was easily amorphized and irreversibly lost the ferromagnetic phase under low pressure (P </= 1.0 GPa). The flexible cyanide-bridged magnetic frameworks demonstrate well the pressure response as a reflection of differences in the magnetic structure and the framework strength in the GPa range.

Spin-Crossover Behavior in Cyanide-bridged Iron(II)−Gold(I) Bimetallic 2D Hofmann-like Metal−Organic Frameworks

The synthesis and characterization of new two-dimensional (2D) cyanide-bridged iron(II)-gold(I) bimetallic coordination polymers formulated, {Fe(3-Xpy)2[Au(CN)2]2} (py = pyridine; X = F (1), Cl (2), Br (3), and I (4)) and the clathrate derivative {Fe(3-Ipy)2[Au(CN)2]2}.1/2(3-Ipy) (5), are reported. The iron(II) ion lies in pseudoctahedral [FeN6] sites defined by four [Au(CN)2](-) bridging ligands and two 3-Xpy ligands occupying the equatorial and axial positions, respectively. Although only compounds 2 and 4 can be considered strictly isostructurals, all of the components of this family are made up of parallel stacks of corrugated {Fe[Au(CN)2]2}n grids. The grids are formed by edge sharing of {Fe4[Au(CN)2]4} pseudosquare moieties. The stacks are constituted of double layers sustained by short aurophilic contacts ranging from 3.016(2) to 3.1580(8) A. The Au...Au distances between consecutive double layers are in the range of 5.9562(9)-8.790(2) A. Compound 5, considered a clathrate derivative of 4, includes one-half of a 3-Ipy molecule per iron(II) atom between the double layers. Compound 1 undergoes a half-spin transition with critical temperatures Tc downward arrow = 140 K and Tc upward arrow = 145 K. The corresponding thermodynamic parameters derived from differential scanning calorimetry (DSC) are Delta H = 9.8 +/- 0.4 kJ mol(-1) and Delta S = 68.2 +/- 3 J K mol(-1). This spin transition is accompanied by a crystallographic phase transition from the monoclinic P2(1)/c space group to the triclinic P1 space group. At high temperatures, where 1 is 100% high-spin, there is only one crystallographically independent iron(II) site. In contrast, the low temperature structural analysis shows the occurrence of two crystallographically independent iron(II) sites with equal population, one high-spin and the other low-spin. Furthermore, 1 undergoes a complete two-step spin transition at pressures as high as 0.26 GPa. Compounds 2- 4 are high-spin iron(II) complexes according to their magnetic and [FeN6] structural characteristics. Compound 5, characterized for having two different iron(II) sites, displays a two-step spin transition with critical temperatures of Tc(1) = 155 K, Tc(2) downward arrow = 97 K, and Tc(2) upward arrow = 110 K. This change of spin state takes place in both sites simultaneously. All of these results are compared and discussed in the context of other {Fe(L) x [M(I)(CN)2]} coordination polymers, particularly those belonging to the homologous compounds {Fe(3-Xpy)2[Ag(CN)2]2} and their corresponding clathrate derivatives.

Soluble Ligand-Stabilized Cyano-Bridged Coordination Polymer Nanoparticles

Size controlled organic phase soluble cyano-bridged bimetallic coordination polymer nanoparticles made of Mn+ and [M′(CN)6]3− (with Mn+ = Mn2+, Ni2+, Fe2+, Eu3+, Tb3+, Sm3+ and M′ = Fe3+, Cr3+) were synthesized by using oleic acid and trialkylamines or a triarylamine as stabilizing agents. The obtained nanoparticles were studied by transmission electronic microscopy (TEM), infrared and electronic spectroscopy, X-ray diffraction, and magnetic measurements. These analyses revealed the formation of spherical metallic cyano-bridged nanoparticles with sizes in the range of 2–5 nm depending on the nature of the metal ion used. The magnetic studies of these colloidal solutions revealed the presence of a pure superparamagnetic regime for the nanoparticles based on [Cr(CN)6]3− and a collective regime caused by weak dipolar interparticle interactions for the nanoparticles based on [Fe(CN)6]3−.

Bimetallic Metal‐Organic Frameworks Containing the ${\rm [M(2,}x-{\rm pdc)^{2-}_{2}}]$ (M = Cu, Pd, Pt; x = 4, 5) Building Block – Synthesis, Structure, and Magnetic Properties

AbstractNew bimetallic coordination polymers containing the ${\rm [Cu(2,}x-{\rm pdc)^{2-}_{2}}]$ (pdc = pyridine dicarboxylate, NC5H3(CO2)2; x = 4,5) ‘metalloligand’ unit, linked by MnII or CoII cations, have been obtained by hydrothermal synthesis. The metalloligand species K2[Cu(2,x−pdc)2(OH2)n]·mH2O (1, 2) were reacted under basic conditions with MnCl2 at 200 °C to form the compounds [CuMn(2,x−pdc)2] (3, x = 4; 4, x = 5), which are unexpectedly isostructural. Similar reaction with CoCl2 gave [Co3Cu2(2,4–pdc)4(μ4−OH)2(OH2)]2 (5), which has a ladder‐like framework based on Co‐hydroxide chains, and the 2‐dimensional sheet polymer [CoCu(2,4‐pdc)2(OH2)4] (6). A related CuII‐only chain compound, [Cu2(2,5−pdc)2(OH2)2]·4H2O (7) is also reported. The compounds 1–7 have been structurally characterized by single crystal X‐ray diffraction. The DC magnetic susceptibilites of 3–6 and [M3M′2(2,4−pdc)4(μ4−OH)2(OH2)] (8: M = Co, M′ = Pd; 9: M = Co, M′ = Pt; 10: M = Ni, M′ = Pd; 11: M = Ni, M′ = Pt) have been studied by SQUID magnetometry; 3 and 4 undergo antiferromagnetic ordering at low temperature, 5, 8 and 9 are metamagnets, 6 exhibits weak ferromagnetic exchange, while 10 and 11 show canted antiferromagnetism.

Monolayers, Langmuir–Blodgett films of bimetallic coordination polymers of 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine

Building blocks of coordination polymers have attracted much attention because of promising applications in porous materials, molecular engineering and devices. We report here an interfacial self-assembly of bimetallic coordination polymer of Cd–Fe(pyterpy) 2 (pyterpy: 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine). The surface pressure–area and area–time isotherms indicated that stable monolayers of Fe(pyterpy) 2(BF 4) 2 could be formed on the 0.1 mol/l CdCl 2 subphase surface after an interfacial coordination reaction over 12 h. By using the Langmuir–Blodgett (LB) method, monolayers of the Cd–Fe(pyterpy) 2 coordination polymer were transferred on the substrate surfaces, and characterized by using the UV–vis absorption and X-ray photoelectron spectroscopy, as well as transition electron microscopy. The spectral data revealed that the LB film was composed of C, Cl, Cd, N and Fe elements, which was in agreement with the composition of the coordination polymer. Reversible redox wave centered at about 500 mV (vs Ag/AgCl) was recorded for the electrode modified with the LB film of the coordination polymer. The present method could be developed to prepare two- and three-dimensional nanoporous building blocks containing two metal ions.

Poly[aqua(μ-5′-carboxy-2,2′-bipyridine-5-carboxylato)dichloridorubidium(I)platinum(II)

In the bimetallic coordination polymer [PtRbCl2(C12H7N2O4)(H2O)]n, the PtII atom has a square-planar configuration, with two cis-coordinated N atoms from a 2,2′-bipyridine-5,5′-dicarboxyl­ate ligand and two terminal Cl atoms. The carboxyl­ate groups are further connected to Rb ions, forming two-dimensional sheets, which again are linked together through Rb—Cl bonds, forming a three-dimensional structure. The bimetallic coordination polymer contains PtII sites with the same configuration as homogenous Pt-containing metal–organic complexes, which proved to be active species in C—H bond-activation reactions.