Central Metal Atom Research Articles

Synthesis, Structures, and Properties of Lanthanide Complexes with Pyrimidine‐2‐carboxylic Acid

Six lanthanide complexes [Ln(pmc)2NO3]n [Hpmc = pyrimidine‐2‐carboxylic acid, Ln = La (1), Pr (2)], [Ln(pmc)2(H2O)3]NO3·H2O [Ln = Eu (3), Tb (4) Dy (5), Er (6)] were synthesized by the reactions of lanthanide nitrate and pyrimidine‐2‐carboxylic acid in water at room temperature. These complexes were characterized by single‐crystal X‐ray diffraction analysis, elemental analysis, IR, circular dichroism (CD) and fluorescence spectra. Structure analysis shows that complexes 1 and 2 are isostructural with P43212 space group, whereas isostructural complexes 3–6 belong to the P21/c space group. In complexes 1 and 2, the central metal atoms are coordinated by nitrates and pmc–, which are self‐assembled to construct a 3D porous network with 62.62.62.62.62.62 (66) topology. In complexes 3–6, H2O and pmc– ligands are coordinated and the complexes exhibit a one‐dimensional zigzag chain, which is further expanded into a 3D structure by hydrogen bonding. In addition, the circular dichroism of 1 and 2 proves that the two complexes are both chiral with achiral ligand of Hpmc. Luminescent measurements of compounds 3–5 indicate that the characteristic fluorescence of Eu3+, Tb3+, and Dy3+ are observed.

Two new Zinc(II) and Cadmium(II) complexes of a semi-rigid bis(2-benzimidazole): Synthesis and characterization

ABSTRACTTwo new complexes Zn(TBimE)Cl2 1 and Cd(TBimE)(I)2 2 based on a semi-rigid ligand TBimE (TBimE = (E)-1,2-bis(2-benzimidazolyl)ethane) have been synthesized and their structures have been determined by X-ray single crystal diffractometry. X-ray diffraction analyses reveal that the “trans” TBimE is converted into “cis” conformation in the structures of the complexes, so that the TBimE can be used as a bidentate ligand to chelate the Zinc(II) and Cadmium(II) ions. Both 1 and 2 exhibit distorted tetrahedral geometries and the central metal atoms are coordinated by two N atoms from TBimE and two anions. The UV–Vis and emission spectra show that both the absorption and the emission of the complexes are assigned to the intraligand transitions and intraligand fluorescence, respectively.

Mixing of MnPc electronic states at the MnPc/Au(110) interface.

Manganese-phthalocyanines form assembled chains with a variety of ordered super-structures, flat lying along the Au(110) reconstructed channels. The chains first give rise to a ×5 symmetry reconstruction, while further deposition of MnPc leads to a ×7 periodicity at the completion of the first single layer. A net polarization with the formation of an interface dipole is mainly due to the molecular π-states located on the macrocycles pyrrole rings, while the central metal ion induces a reduction in the polarization, whose amount is related to the Mn-Au interaction. The adsorption-induced interface polarization is compared to other 3d-metal phthalocyanines, to unravel the role of the central metal atom configuration in the interaction process of the d-states. The MnPc adsorption on Au(110) induces the re-hybridization of the electronic states localized on the central metal atom, promoting a charge redistribution of the molecular orbitals of the MnPc molecules. The molecule-substrate interaction is controlled by a symmetry-determined mixing between the electronic states, involving also the molecular empty orbitals with d character hybridized with the nitrogen atoms of the pyrrole ring, as deduced by photoemission and X-ray absorption spectroscopy exploiting light polarization. The symmetry-determined mixing between the electronic states of the Mn metal center and of the Au substrate induces a density of states close to the Fermi level for the ×5 phase.

Synthesis, Crystal Structures, and Luminescent Properties of a Series of Coordination Compounds bearing Quinoline‐2‐tetrazolato Ligands

Four new coordination compounds, [Cd(L1)2]n (1), [Mn(L1)2]n (2), [Zn(L1)(NA)] (3), and [Pb(L1)2(H2O)] (4) were obtained on the basis of the in‐situ ligand reactions of quinoline‐2‐carbonitrile (QCN) and NaN3 under solvothermal conditions. 1 and 2 are 1D isostructural chains, where the central metal atoms are six‐coordinate by six nitrogen atoms in a distorted octahedron. The cycloaddition reaction of QCN and NaN3 in the presence of hydrated ZnCl2 occur with the aid of the ancillary ligand nicotinic acid (NA), where NA not only provides an acidic environment but also serves as an ancillary ligand. The extended structure of 3 is a 1D ladder‐like polymer. Compound 4 is a mononuclear Pb2+ compound. All the compounds were structurally characterized by X‐ray crystallography and their luminescent properties were investigated in detail.

The Stepwise Reaction of Rhodium and Iridium Complexes of Formula [MCl2 (κ4 C,N,N',P-L)] with Silver Cations: A Case of trans-Influence and Chiral Self-Recognition.

Acetonitrile suspensions of the dichlorido complexes [MCl2 (κ4 C,N,N',P-L)] [M=Rh (1), Ir (2)] react with AgSbF6 in a 1:2 molar ratio affording the bis-acetonitrile complexes [M(κ4 C,N,N',P-L)(NCMe)2 ][SbF6 ]2 (3 and 4). The reaction takes place in a sequential manner and the intermediates can be isolated varying the M:Ag molar ratio. In a 2:1 molar ratio, it affords the dimetallic monochlorido-bridged compounds [{MCl(κ4 C,N,N',P-L)}2 (μ-Cl)][SbF6 ] (5 and 6). In a 1:1 molar ratio, the monosubstituted solvato-complexes [MCl(κ4 C,N,N',P-L)(Solv)][SbF6 ] (Solv=H2 O, MeCN, 7-10) were obtained. Finally, in a 2:3 molar ratio, it gives complexes 11 and 12 of formula [{M(κ4 C,N,N',P-L)(NCMe)(μ-Cl)}2 Ag][SbF6 ]3 in which a silver cation joints two cationic monosubstituted acetonitrile-complexes [MCl(κ4 C,N,N',P-L)(NCMe)]+ through the remaining chlorido ligands and two Ag⋅⋅⋅C interactions with one of the phenyl rings of each PPh2 group. In all the complexes, the aminic nitrogen and the central metal atom are stereogenic centers. In the trimetallic complexes 11 and 12, the silver atom is also a stereogenic center. The formation of the cation of the dimetallic complexes 5 and 6, as well as that of the trimetallic complexes 11 and 12, takes place with chiral molecular self-recognition. Experimental data and DFT calculations provide plausible explanations for the observed molecular recognition. The new complexes have been characterized by analytical, spectroscopic means and by X-ray diffraction methods.

Transition-Metal-Controlled Inorganic Ligand-Supported Non-Precious Metal Catalysts for the Aerobic Oxidation of Amines to Imines.

Most state-of-art transition-metal catalysts usually require organic ligands, which are essential for controlling the reactivity and selectivity of reactions catalyzed by transition metals. However, organic ligands often suffer from severe problems including cost, toxicity, air/moisture sensitivity, and being commercially unavailable. Herein, we show a simple, mild, and efficient aerobic oxidation procedure of amines using inorganic ligand-supported non-precious metal catalysts 1, (NH4 )n [MMo6 O18 (OH)6 ] (M=Cu2+ ; Fe3+ ; Co3+ ; Ni2+ ; Zn2+ , n=3 or 4), synthesized by a simple one-step method in water at 100 °C, demonstrating that the catalytic activity and selectivity can be significantly improved by changing the central metal atom. In the presence of these catalysts, the catalytic oxidation of primary and secondary amines, as well as the coupling of alcohols and amines, can smoothly proceed to afford various imines with O2 (1 atm) as the sole oxidant. In particular, the catalysts 1 have transition-metal ion core, and the planar arrangement of the six MoVI centers at their highest oxidation states around the central heterometal can greatly enhance the Lewis acidity of catalytically active sites, and also enable the electrons in the center to delocalize onto the six edge-sharing MO6 units, in the same way as ligands in traditional organometallic complexes. The versatility of this methodology maybe opens a path to catalytic oxidation through inorganic ligand-coordinated metal catalysis.

Dimeric Ruthenium(II)-NNN Complex Catalysts Bearing a Pyrazolyl-Pyridylamino-Pyridine Ligand for Transfer Hydrogenation of Ketones and Acceptorless Dehydrogenation of Alcohols

Dimeric pincer-type ruthenium(II)-NNN complexes bearing an unsymmetrical pyrazolyl-pyridylamino-pyridine ligand were prepared and characterized by NMR, elemental analysis, and X-ray single crystal structural determination. These complexes exhibited very high catalytic activity for both transfer hydrogenation of ketones and acceptorless dehydrogenation of secondary alcohols, achieving TOF values up to 1.9 × 106 h–1 in the transfer hydrogenation of ketones. The high catalytic activity of the Ru(II) complex catalysts is attributed to the presence of the unprotected NH functionality in the ligand and hemilabile unsymmetrical coordination environment around the central metal atoms in the complex.

(C7H7NO4Mo)n: Synthesis, characterization and thermal stability of a new oxo-bridged helical-1D-polymer cluster

A new look of helical-1D-polymeric cluster of molybdenum (C7H7NO4Mo)n (1) is herein reported. The one dimensional polymeric molybdenum cluster was generated from a mixture of Na2MoO4, 2, 6-pyridinedimethanol (pdm), RuCl3 and chloroacetic acid in methanol. Single crystal X-ray diffraction study of the isolated crystal shows that it is a μ2-oxo bridged 1D-Polymer assembly of molybdenum pdm2− complex where the nitrogen atom, two de-protonated ‘O’ atoms of the pdm2− ligand are connected to the central metal atoms. Furthermore, terminally connected double bonded ‘O’ atoms fulfilled the distorted octahedral environment of the metal atoms. In addition, BVS calculations show that Mo atoms are exists in +VI oxidation state in complex 1. The oxidation state of the metal atoms is further confirmed from the cyclic voltammogram. FT-IR spectroscopy and elemental analysis of the isolated crystals further supports the functional group attached to the periphery of the metal ion. Thermal gravimetric analysis of complex 1 confirms the thermodynamic stability of the polymer up to 190 °C.

Noncovalent complexes of Ih−C80 fullerene with phthalocyanines

ABSTRACTThe noncovalent interactions of Ih−C80 fullerene with free-base and 3d transition M(II) phthalocyanines (where M = Mn, Fe, Co, Ni, Cu, Zn) were studied at the PBE-D/DNP level of density functional theory. The optimized complex geometries, formation energies and electronic parameters were analyzed and compared to those reported previously for similar dyads with C60. In the complexes with Ih−C80, the central metal atom (as well as one H atom of H2Pc) is always coordinated to a C6:6:6 atom of C80 cage, exhibiting only one general interaction pattern. The shortest M…CC80 and N…CC80 distances are notably longer than in dyads with C60, and the distortion of Pc macrocycle is less significant. In none of C80-based dyads the formation of new coordination bonds by metal atoms was observed. The bonding strength for Pc–C80 dyads varies approximately to the same degree of 20 kcal/mol as for their Pc–C60 analogues, however negative formation energies for Pc–C80 dyads are on average by 5–6 kcal/mol lower than for their C60 analogues. While in closed-shell Pc–fullerene systems HOMO is usually found totally on Pc molecule, in the case of C80-based dyads only a minor HOMO fraction can be detected for some dyads on Pc, with the major one always distributed over fullerene cage. As a result, the calculated HOMO-LUMO gap energies turn to be very low, around 0.1 eV. Analysis of spin density plots revealed that H2Pc+C80, NiPc+C80 and ZnPc+C80 dyads behave as closed-shell systems, like similar noncovalent complexes of Pcs with C60.

Highly efficient one-step synthesis of carbon encapsulated nanocrystals by the oxidation of metal π-complexes

Various carbon encapsulated nanocrystals, including MnS and MnO, Cr2O3, MoO2, Fe7S8 and Fe3O4, and ZrO2, are prepared in one step and in situ by a simple and highly efficient synthesis approach. The nanocrystals have an equiaxed morphology and a median size smaller than 30 nm. Tens and hundreds of these nanocrystals are entirely encapsulated by a wormlike amorphous carbon shell. The formation of a core–shell structure depends on the strongly exothermic reaction of metal π-complexes with ammonium persulfate in an autoclave at below 200 °C. During the oxidation process, the generated significant amounts of heat will destroy the molecular structure of the metal π-complex and cleave the ligands into small carbon fragments, which further transform into an amorphous carbon shell. The central metal atoms are oxidized to metal oxide/sulfide nanocrystals. The formation of a core–shell structure is independent of the numbers of ligands and carbon atoms as well as the metal types, implying that any metal π-complex can serve as a precursor and that various carbon encapsulated nanocrystals can be synthesized by this method.

Antibacterial evaluation of Some Synthesis Complexes of Azo-dye Ligands.

In present work, two ligands, azo Schiff-base (AZD1 and AZD2), were synthesized by twosteps. Firstly, Schiff-bases were prepared by condensation of Salicyldehyde with anthranilic acid, followed by diazotization of aromatic amines and their subsequent coupling reaction with Schiff-bases. Consequently, 8 complexes of the type [M(AZD1)Cl2] and [M(AZD2)Cl2], where M = Cu(II), Ni(II), Co(II), Mn(II); were synthesized and characterized with the help of molarconductance, magnetic susceptibility measurements, FT-IR, micro elemental analysis , H1 NMR,and Uv–visible spectroscopy. The spectral data revealed that the ligands act as bidentate ligand,the hydroxyl of carboxylic group and the azo group in AZD1 and hydroxyl of phenyl group andthe azomethin group in AZD2 ligand are co-ordination to the central metal atoms. Lastly, all thecompounds were screened for their antibacterial activity, using well-diffusion method. Inconclusion, the ligands and some of the complexes exhibited appreciable antibacterial activityagainst Escherichia coli Klebsiella pneumonia and Staphylococcus haemolyticus andStaphylococcus aurous.

Synthesis, spectroscopic, antimicrobial, XRD, fluorescence of new Ni(II), Cd(II), Hg(II) and U(VI) complexes with 1-(2-furylmethylene)-N-(3-phenylallylidene)methanamine Schiff base

The 1:1 condensation of 2-furfurylamine and cinnamaldehyde under template condition gives the Schiff base ligand 1-(2-furylmethylene)-N-(3-phenylallylidene)methanamine (L). The reaction of the ligand with Ni(II), Cd(II), Hg(II) and U(VI) ions gives a series of novel complexes formulated as [NiLCl(H2O)]Cl·1½H2O, [CdL2(H2O)2]·2NO3·½H2O, [HgL2Cl2] and [UO2L3]·2NO3·H2O. The stoichiometry of the complexes was 1:1 for Ni(II), 1:2 for both Cd(II) and Hg(II) and 1:3 (M:L) for U(VI) complexes. The molar conductance of the complexes lies in the range of 135–250 Ω−1mol−1cm2 indicating their electrolytic behavior except Hg(II) complex. Electronic spectra and magnetic moments suggested varieties of geometries around the central metal atoms. The emission spectra of these complexes indicate the luminescence characteristics of the complexes. The X-ray diffraction (XRD) patterns of Schiff base and its complexes were investigated in powder forms. Thermodynamic parameters were computed from the thermal data using Coats and Redfern method. Structural optimization of the ligand and its Ni(II), Cd(II) and Hg(II) complexes was computed using the density functional theory (DFT), where the B3LYP functional was employed. The synthesized complexes exhibited higher antimicrobial activity than its free Schiff base ligand.

Complexation of free-base and 3d transition metal(II) phthalocyanines with fullerene C60: A dispersion-corrected DFT study

ABSTRACTWe performed a systematic comparative theoretical study of noncovalent interactions of free-base H2Pc and a series of 3d transition metal(II) phthalocyanines (where the transition metals included manganese, iron, cobalt, nickel, copper and zinc) with fullerene C60, by employing a DFT technique accounting for vdW interactions (PBE GGA functional with a dispersion correction by Grimme). We observed four different types of Pc interaction with fullerene cage, depending on central metal atom. Upon complexation with C60, the macrocyclic plane undergoes distortion in all cases, to a different degree. Some correlation was observed between the calculated formation energies for Pc–fullerene complexes and intermolecular separations in them, where stronger binding is generally associated with shorter M…CC60 and N…CC60 distances. Despite of considerable differences in the structure of Pc–fullerene complexes, the latter do not exhibit notable variations in the distribution of electrostatic potential, contrary to spin density plots for open-shell species. Similarly, HOMO and LUMO distribution can vary within some limits.

DFT computational correlations on conformational barriers of Zn2+ and Ni2+ chiral meso-(α,β-unsaturated)- porphyrins.

Correlations between DFT and experimental measurements on Zn2+ and Ni2+ chiral meso-(α,β-unsaturated)- porphyrins were performed using Kohn-Sham methodology. The exchange-correlation Becke88-Perdew86 functional was used in conjunction with double-zeta Slater basis sets. An accurate description of the electronic processes depending on the metal ion (Zn, Ni) or ligand (perilaldehyde and myrtenal) was made, confirming experimental results in terms of structural and electronic modifications. Moreover, this theoretical study provides a stronger knowledge and interpretation of the dynamical conformational features of the free base, Zn and Ni structures. Fundamental links between the central metallic atom and distortions of the porphyrinic core and ligands were demonstrated, in agreement with experimental data. We observed that the core in ZnPeriP and ZnMyrtP species is almost flat, in comparison with the Ni porphyrinic core, which appeared much more distorted. The type of distortion differs between PeriP and MyrtP ligands, with a combined saddled-ruffled characteristic with the former and a pronounced ruffled twisting for the latter. Finally, conformational energy barriers were extracted by spinning one of the arms in steps of 20° in a 360° dihedral angle. The resulted conformational barriers for NiPeriP or NiMyrtP are lower in energy than for ZnPeriP or ZnMyrtP, in agreement with experimental data.

Vanadium pincer complex: synthesis, characterization, catalysis and biological studies

New vanadium coordinated pincer complex is synthesized and characterized. Coordinating organic ligand (L1) is designed to afford ONO coordination mode. Metal complex (ML1) prepared by reacting VO(acac)2 with 2-hydroxy-3,5-ditertiarybutyl benzaldehyde and o-aminophenol in methanol (where acac stands for acetylacetonate). Ligand (L1) coordinates the central vanadium metal atom via ONO fashion hence occupied three coordination sites. For charge compensation vanadium retains one of the acetyl aetonate ligand and finally sixth coordination satisfied by terminal oxo group consequently attains octahedral geometry. This pincer type coordinated ligand provides strong meridonial environment to the metal center and also support to stabilize the higher oxidation state of vanadium. The complex is characterized by available analytical techniques such as Molar Conductance, UV-visible, IR, Cyclic Voltametry (CV), and Thermogravimetric Analysis (TGA). Biological behavior has been investigated towards antibacterial activity. The complex also successfully utilized as catalyst for the simple organic transformation.

Synthesis and Characterization with Antimicrobial Activity Studies on some Transition Metal Complexes of N, O Donor Novel Schiff Base Ligand

Metal complexes of Mn(II), Fe(II), Co(II) and Cd(II) ions with Schiff base ligand 4-{(pyridin-2-ylimino)methyl}phenol derived from condensation of 2-amino pyridine with 4-hydroxybenzaldehyde was prepared. The ligand and complexes were isolated from the reaction in the solid form and characterized by conductivity, magnetic moment, TLC, IR, UV-Visible, thermal analysis and some physical measurements. During complexation reaction with transition metal ions Schiff base act as a deprotonated tridentate ligand and IR spectra showed that N and O atoms are coordinated to the central metal atom. The observed values confirmed that the complexes have octahedral geometry. The Schiff base and its metal complexes have been found to have moderate to strong antibacterial activity.

Quantitative Structure-Thermostability Relationship of Late Transition Metal Catalysts in Ethylene Oligo/Polymerization

Quantitative structure–thermostability relationship was carried out for four series of bis(imino)pyridine iron (cobalt) complexes and α-diimine nickel complexes systems in ethylene oligo/polymerization. Three structural parameters were correlated with thermal stability, including bond order of metal-nitrogen (B), minimum distance (D) between central metal and ortho-carbon atoms on the aryl moiety and dihedral angle (α) of a central five-membered ring. The variation degree of catalytic activities between optimum and room temperatures (AT) was calculated to describe the thermal stability of the complex. By multiple linear regression analysis (MLRA), the thermal stability presents good correlation with three structural parameters with the correlation coefficients (R2) over 0.95. Furthermore, the contributions of each parameter were evaluated. Through this work, it is expected to help the design of a late transition metal complex with thermal stability at the molecular level.

Tetrabutylammonium Salts of Aluminum(III) and Gallium(III) Phthalocyanine Radical Anions Bonded with Fluoren-9-olato- Anions and Indium(III) Phthalocyanine Bromide Radical Anions.

Reduction of aluminum(III), gallium(III), and indium(III) phthalocyanine chlorides by sodium fluorenone ketyl in the presence of tetrabutylammonium cations yielded crystalline salts of the type (Bu4 N+ )2 [MIII (HFl-O- )(Pc.3- )].- (Br- )⋅1.5 C6 H4 Cl2 [M=Al (1), Ga (2); HFl-O- =fluoren-9-olato- anion; Pc=phthalocyanine] and (Bu4 N+ ) [InIII Br(Pc.3- )].- ⋅0.875 C6 H4 Cl2 ⋅0.125 C6 H14 (3). The salts were found to contain Pc.3- radical anions with negatively charged phthalocyanine macrocycles, as evidenced by the presence of intense bands of Pc.3- in the near-IR region and a noticeable blueshift in both the Q and Soret bands of phthalocyanine. The metal(III) atoms coordinate HFl-O- anions in 1 and 2 with short Al-O and Ga-O bond lengths of 1.749(2) and 1.836(6) Å, respectively. The C-O bonds [1.402(3) and 1.391(11) Å in 1 and 2, respectively] in the HFl-O- anions are longer than the same bond in the fluorenone ketyl (1.27-1.31 Å). Salts 1-3 show effective magnetic moments of 1.72, 1.66, and 1.79 μB at 300 K, respectively, owing to the presence of unpaired S=1/2 spins on Pc.3- . These spins are coupled antiferromagnetically with Weiss temperatures of -22, -14, and -30 K for 1-3, respectively. Coupling can occur in the corrugated two-dimensional phthalocyanine layers of 1 and 2 with an exchange interaction of J/kB =-0.9 and -1.1 K, respectively, and in the π-stacking {[InIII Br(Pc.3- )].- }2 dimers of 3 with an exchange interaction of J/kB =-10.8 K. The salts show intense electron paramagnetic resonance (EPR) signals attributed to Pc.3- . It was found that increasing the size of the central metal atom strongly broadened these EPR signals.

Metal–metal bonding in biscycloheptatrienyl dimetal compounds of the second‐row transition metals

AbstractDensity functional theory has been used to examine the dimetallocene‐like dicycloheptatrienyl dimetal compounds of the second‐row transition metals (C7H7)2M2 (M = Ru, Tc, Mo, Nb, Zr). The lowest energy (C7H7)2Mo2 structure is a coaxial structure with terminal η7C7H7 rings, whereas the lowest energy (C7H7)2M2 structures (M = Ru, Tc, Nb, Zr) are perpendicular structures with bridging η4,η4C7H7 rings except for the perpendicular (η4,η3C7H7)2Ru2 structure. The metal–metal bond orders in the (C7H7)2M2 structures (M = Ru, Tc, Mo, Nb), as determined by analysis of their frontier molecular orbitals, suggest preferred 16‐ rather than 18‐electron configurations for the central metal atoms. Thus, in the coaxial (η7C7H7)2M2 structures the formal bond orders are two for M = Tc and three for M = Mo. For the perpendicular structures both (η4,η3C7H7)2Ru2 and (η4,η4C7H7)2Tc2 have 16‐electron configurations with metal–metal single bonds owing to the different modes of bonding of the bridging C7H7 rings in the two structures. For the (C7H7)2Zr2 system the perpendicular structure has a formal ZrZr double bond and the coaxial structure has a very long (∼3.5 Å) ZrZr bond indicating only 12‐ to 14‐electron configurations for the zirconium atoms.

Synthesis, Structure, and Properties of New Mg(II)-Metal–Organic Framework and Its Prowess as Catalyst in the Production of 4H-Pyrans

A new alkaline metal–organic framework, [Mg3(NDC)3(DMF)4]·H2O (1) is synthesized solvothermally by using 2,6-naphthalenedicarboxylic acid (NDC) as ligand and dimethylformamide (DMF) and water as mixed solvent. Single crystal X-ray studies show that 1 crystallizes in the space group C2/c with parameters a = 13.4191(2), b = 18.0669(2), c = 20.9746(3) A, and β = 99.66(0)o. The central metal atom Mg(II) adopts a six coordinated octahedral geometry with carboxylate oxygen atoms and DMF molecules. Due to the involvement of oxygen atoms in bridging and chelation binding, a trinuclear secondary building unit is built up, which further connects to other six NDC ligands and finally leading to a three-dimensional network. The thermal and luminescent analysis revealed that the compound is thermally stable with violet emission. The creation of coordinatively unsaturated Mg(II) centers, acting as Lewis-acidic sites upon activation, are explored to use 1 as heterogeneous catalyst in value-added organic conversions. MOF ...