We present the synthesis and crystal structure of trinuclear copper complex [Cu3(saltag)(bpy)3]ClO4·3DMF [H5saltag = tris(2-hydroxybenzylidene)triaminoguanidine; bpy 2,2'-bipyridine]. The crystallizes in trigonal space group R3̅, with all ions being crystallographically equivalent. Analysis temperature dependence magnetic susceptibility shows that triaminoguanidine ligand mediates very strong antiferromagnetic interactions (JCuCu -324 cm(-1)). Detailed analysis magnetization data as well...

Here, two mixed‐ligand mononuclear [Cu(L1)py] (1), [Cu(L2)Him] (2) and one dinuclear copper(II) complex [Cu2(L3)2(DMSO)(MeOH)] (3) were isolated in solid state characterized through SC‐XRD.­ Herein, we highlight the solution behavior of these complexes medium HRMS ESR. Though maintain their integrity with respect to ligand coordination, there is solvent or co‐ligand exchange generation both [Cu(L)(py/Him)] [Cu(L)(H2O)] species. G‐quadruplex (G4‐DNA) structures human telomeric DNA (hTelo)...

Understanding and controlling the spin-crossover properties of molecular complexes can be particular interest for potential applications in spintronics. Using near-edge X-ray absorption fine structure spectroscopy, we investigated these a new vacuum-evaporable Fe(II) complex, namely [Fe(pypyr(CF3)2)2(phen)] (pypyr = 2-(2'-pyridyl)pyrrolide, phen 1,10-phenanthroline). We find that spin-transition temperature, well above room temperature bulk compound, is drastically lowered molecules arranged...

Axial coordination in nickel(II) porphyrins has been thoroughly investigated and is well understood. However, isolated five-coordinate are still elusive after 50 years of intense research, even though they play a crucial role as intermediates enzymes catalysts. Herein we present the first fully stable, characterized porphyrin solution solid state (crystal structure). The spectroscopic properties indicate pure high-spin behavior (S = 1). There distinct differences NMR, UV–vis, redox compared...

The synthesis of ethoxido-bridged dinuclear oxidovanadium(IV) complexes the general formula (HNEt3)[(VOL1–3)2(μ-OEt)] (1–3) with azo dyes 2-(2′-carboxy-5′-X-phenylazo)-4-methylphenol (H2L1, X = H; H2L2, NO2) and 2-(2′-carboxy-5′-Br-phenylazo)-2-naphthol (H2L3) as ligands is reported. differ in substituents at phenyl ring to probe their influence on redox behavior, biological activity, magnetochemistry complexes, for which results are presented discussed. All synthesized vanadium(IV) have...

The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well theoretical methods. This exhibits a strong antiferromagnetic coupling (J -298 cm-1) between the ions, mediated N-N diazine bridges of tritopic ligand, leading to spin-frustrated system. compound shows T2 coherence time 340 ns in frozen pyridine solution, which extends 591 changing solvent pyridine-d5. Hence, presented is...

A family of lanthanide‐based inorganic–organic hybrids, [Ce 4 (PDA) (H 2 O) 9 (SiW 12 O 40 )] · 6H ( 1 , PDA = 1,10‐phenanthroline‐2,9‐dicarboxylic acid), [Nd 5 13 (OH)(SiW 8H ), [Sm 3 16.5H and [Dy 11 7H has been hydrothermally synthesized with the [SiW ] 4– Keggin‐type anion as a building block. Characterization by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), single‐crystal X‐ray diffraction revealed that – are all coordination polymers different structural...

Two polymorphic modifications (1-I and 1-II) of the new spin crossover (SCO) complex [Fe{H2B(pz)(pypz)}2] (pz = pyrazole, pypz pyridylpyrazole; 1) were prepared investigated by differential scanning calorimetry (DSC), magnetic measurements, Mößbauer, vibrational, absorption spectroscopy as well single-crystal X-ray powder diffraction. DSC measurements reveal that upon heating thermodynamically metastable form 1-II to ∼178 °C it transforms into 1-I in an exothermic reaction, which proves...

A cobalt(II)-based spin triangle shows a significant spin-electric coupling. [Co

The reaction of benzyl 2-amino-4,6-O-benzylidene-2-deoxy-alpha-D-glucopyranoside (HL) with the metal salts Cu(ClO(4))(2)6 H(2)O and Ni(NO(3))(2)6 affords via self-assembly a tetranuclear mu(4)-hydroxido bridged copper(II) complex [(mu(4)-OH)Cu(4)(L)(4)(MeOH)(3)(H(2)O)](ClO(4))(3) (1) trinuclear alcoholate nickel(II) [Ni(3)(L)(5)(HL)]NO(3) (2), respectively. Both complexes crystallize in acentric space group P2(1). X-ray crystal structure reveals rare (mu(4)-OH)Cu(4)O(4) core for 1 which is...

Abstract A series of bimetallic zinc(II) and nickel(II) complexes based on the novel dinucleating unsymmetric double‐Schiff‐base ligand benzoic acid [1‐(3‐{[2‐(bispyridin‐2‐ylmethylamino)ethylimino]methyl}‐2‐hydroxy‐5‐methylphenyl)methylidene]hydrazide (H 2 bpampbh) has been synthesized structurally characterized. The metal centers reside in two entirely different binding pockets provided by H bpampbh, a planar tridentate [ONO] pentadentate [ON 4 ] compartment. utilized bpampbh condensation...

Abstract The new cis ‐dioxomolybdenum(VI) complexes [MoO 2 (salhyhb)] ( 1 ), (salhyhp)] and (salhyhh)(MeOH)] 3 ) with the hydrazone ligands H salhyhb, Hsalhyhp, salhyhh derived from salicylaldehyde ω‐hydroxy carbonic acid hydrazides different chain lengths, have been synthesized spectroscopically characterized. crystal structures of all three reveal an octahedral environment for molybdenum atoms same basic structural motif. In addition to two oxo groups [NO ] donor set is observed which...

Abstract The synthesis and spectroscopic characterization of a series three oxidovanadium(V) complexes with 8‐hydroxyquinoline Schiff‐base ligands derived from salicylaldehyde ω‐hydroxy‐functionalized carbohydrazides different chain lengths are reported. complex the hydrazone ligand containing shortest length was crystallographically characterized. This crystallizes in triclinic space group P $\bar {1}$ two structurally similar but independent complexes. Each vanadium atom is six‐coordinate...

A new anionic pillared-layer cobalt(II) metal–organic framework combining 4,4′,4′′-nitrilotribenzoic acid (H3ntb) as a linker and terephthalic (H2bdc) pillar-ligand with the formula {((CH3)2NH2)2[Co3(ntb)2(bdc)]}n (JUMP-1, JUMP = Jena University Magnetic Polymer) has been solvothermally synthesized characterized. The crystal structure of JUMP-1 was determined to belong orthorhombic space group Cmca. It displays three-dimensional (3D) for which topological analysis revealed 3,8-connected net...

Developing new anticancer agents can be useful, with the ability to diagnose and treat cancer worldwide. Previously, we focused on examining effects of nonoxidovanadium(IV) complexes insulin mimetic cytotoxicity activity. In this study, in addition cytotoxic activity, evaluated their bioimaging properties. This study investigates synthesis four stable nonoxido V

Abstract New copper(II) complexes of the hydrazone ligands H 2 salhyhb, salhyhp, and salhyhh, derived from salicylaldehyde ω ‐hydroxy carbonic acid hydrazides, have been synthesized physically characterized. Two fundamental structures were found in solid state depending on pH‐value reaction solution. Acidic conditions lead to formation di‐ μ ‐phenoxo‐bridged dicationic complex dimers [{Cu(Hsalhyhb)} ] 2+ ( 1a ), [{Cu(Hsalhyhp)} 2a [{Cu(Hsalhyhh)} 3a isolated as perchlorate salts. The dimeric...

A series of novel tri- and pentanuclear complexes composed dinuclear LM(2) units (M=Co, Ni, Zn; L=24-membered macrocyclic hexaazadithiophenolate ligand) ferrocenecarboxylate ([CpFeC(5)H(4)CO(2)](-)) or 1,1'-ferrocenedicarboxylate ([Fe(C(5)H(4)CO(2))(2)](2-)) groups is reported. The [LM(II) (2)(O(2)CC(5)H(4)FeCp)](+) (M=Co (6), Ni (7), Zn (8)) [(LM(II) (2))(2)(O(2)CC(5)H(4))(2)Fe](2+) (9), (10)) have been prepared by substitution reactions from labile (2)L'](+) precursors (L'=Cl, OAc) the...

Abstract Copper(II) and nickel(II) complexes with the new Schiff‐base ligands N ‐salicylidene‐3‐(2‐pyridyl)‐propionic acid hydrazide (H 2 salhypyp) newly synthesized ‐Salicylidene‐3‐(1‐benzylimidazol‐2‐yl)‐propionic salhyimp) have been structurally characterized. The crystal structure analysis of metal reveals two fundamentally different structural motifs. Cationic di‐ μ ‐phenolate‐bridged dimers are observed for H salhypyp ligand, [{Cu(H salhypyp)(MeOH)(ClO 4 )} ](ClO ) ( 1 [{Ni(H...

Abstract 2‐Pyridylmethylamine (amp) and 8‐aminochinoline (ach) readily form the following complexes with iron halides in methanol: [(amp) 2 FeCl ] ( 1a ), FeBr 1b [(ach) Fe(MeOH) ]Br 1c [(amp)FeCl (μ‐OMe)] ). Methanol was chosen as a solvent because these reactions are rather complex ether. For example, 3 forms ionic pair [(dme) [FeCl 4 ) 1,2‐dimethoxyethane (dme). The reaction of tridentate di(2‐pyridylmethyl)amine (dpa) tetradentate 1,2‐dipyridyl‐1,2‐diaminoethane (dpdae) yields [(dpa)...