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• 616-29-5 1,3-Diamino-2-hydroxypropane 
• 119-67-5 o-carboxybenzaldehyde 
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• 1035818-07-5 N,N’-bis[2-carboxybenzomethyl]-N,N’-bis[carboxymethyl]-1,3-diaminopropan-2-ol dihydrochloride 

Relevant academic research and scientific papers

The synthesis and characterization of new nickel complexes with unusual coordination modes

Two mononickel complexes, K2[Ni(Hccdp)](CH3OH)·8H2O (1), and [Ni(H2O)6][Ni(H2ccdp)(H2O)2]2·12H2O (2); a dinickel complex, K2[Ni2

New symmetrical dinucleating ligand based assembly of bridged dicopper(II) and dizinc(II) centers: Synthesis, structure, spectroscopy, magnetic properties and glycoside hydrolysis

Two dinuclear copper(II) complexes [Li(H2O)3(CH3OH)]4[Cu2Br4][Cu2(cpdp)(μ-O2CCH3)]4(OH)2 (1), [Cu(H2O)4][Cu

Synthesis, structure and properties of new heterometallic octanuclear Li2Na2Cu4 and decanuclear Li2Zn8 complexes

A carboxylate containing polydentate ligand in combination with exogeneous succinate (suc) has been used to stabilize heterometallic octanuclear [Li2Na2Cu4(cpdp)2(suc)2(CH3OH)2(H2O)4]Cl2·6H2O (1) and decanuclear Na(H3O)2[Li2Zn8(cpdp)4(suc)2(H2O)4]Cl2Br3·6MeOH·19H2O (2) complexes. The reaction of ligand H3cpdp (H3cpdp = N,N'-bis[2-carboxybenzomethyl]-N,N'-bis[2-pyridylmethyl]-1,3-diaminopropan-2-ol) with stoichiometric amounts of CuCl2/sodium succinate, and ZnCl2/sodium succinate, allowed isolation of complexes 1 and 2, respectively. Analyses of single crystal X-ray structures indicate that complex 1 is capped by two [Cu2(cpdp)]+ molecular building units and two succinate linkers, while complex 2 is overlaid by four [Zn2(cpdp)]+ molecular building units and two succinate linkers. Whereas complex 1 shows monodentate terminal and tridentate μ3:η2:η1:η1 bridging coordination of carboxylate, and μ4:η2:η1:η1:η1 bridging mode of succinate, complex 2 displays monodentate terminal and anti-anti μ2:η1:η1 bidentate bridging coordination of carboxylate, and μ4:η1:η1:η1:η1 bridging mode of succinate. To our knowledge, 1 is the first example of copper/lithium/sodium-based hetero-octanuclear complex with any class of bridging or non-bridging ligand showing three different binding modes of carboxylates. Again, 2 is also the first example of a hetero-decanuclear metallomacrocyclic complex with any class of bridging or non-bridging ligand combining both lithium and zinc. Variable temperature magnetic investigation of 1 discloses sensible antiferromagnetic interactions intermediated among the copper centers. Thermal behavior of 1 and 2 has been examined by thermogravimetric analysis indicating that the complexes are stable up to ～430 °C.

Bis(μ-alkoxo) bridged dinuclear CuII2 and Zn II2 complexes of an isoindol functionality based new ligand: Synthesis, structure, spectral characterization, magnetic properties and catechol oxidase activity

Two new dinuclear copper(II) and zinc(II) complexes of an isoindol functionality based new dinucleating ligand, H3hdpa (H 3hdpa = 2-({[2-hydoxyethyl]-[2-hydroxy-3-(1-oxo-1,3-dihydro-isoindol- 2-yl)-propyl]-amino}-methyl)-benzoic acid) have been synthesized and characterized. In methanol, the reaction of stoichiometric amounts of Cu(OAc)2·H2O and the ligand H3hdpa in the presence of NaOH at ambient temperature afforded a new dinuclear copper(II) complex, [Cu2(Hhdpa)2]·2CH3OH· 6H2O (1). Similarly, in methanol, the reaction of stoichiometric amounts of Zn(OAc)2·2H2O and H3hdpa in the presence of NaOH yielded a new dinuclear zinc(II) complex, Na 4[Zn2(hdpa)2](OAc)2 (2). Characterization of the complexes has been performed using various analytical techniques, including single crystal X-ray structure determination. The X-ray crystal structure of complex 1 reveals that two copper(II) centers adopt a five-coordinate square pyramidal geometry with a Cu-Cu separation of 2.910 A?. The DFT optimized structure of complex 2 shows that two zinc(II) centers are in a distorted trigonal bipyramidal geometry with a Zn-Zn separation of 3.124 A?. 1H and 13C NMR spectroscopic investigations authenticate the integrity of complex 2 in solution. Further, the mass spectroscopic analyses of complexes 1 and 2 reconfirm their dimeric nature, even in solution. Variable-temperature (2-300 K) magnetic susceptibility measurements show the presence of antiferromagnetic interactions (J = -52.20 cm-1) between the two copper(II) centers in complex 1. The catechol oxidase activity of complexes 1 and 2 has been investigated in methanol medium by the UV-Vis spectrophotometric technique using 3,5-di-tert-butylcatechol as a model substrate. Both complexes are active in catalyzing the aerobic oxidation of 3,5-di-tert-butylcatechol (3,5-DTBC) to 3,5-di-tert-butyl-1,2-benzoquinone (3,5-DTBQ). A DFT calculation has been performed to find the Fukui functions at the metal centers in complexes 1 and 2 to predict the possible metal centers involved in the binding process with 3,5-DTBC during the catalytic oxidation reactions.

Synthesis and characterization of mono- and μ6-sulfato hexanuclear zinc complexes of a new symmetric dinucleating ligand

Zinc complexes of a new symmetric dinucleating ligand, N,N′-Bis[2- carboxybenzomethyl]-N,N′-Bis[carboxymethyl]-1,3-diaminopropan-2-ol (H 5ccdp) with mixed donating groups, have been studied in the solid state as well as in solution. In methanol, the reaction of stoichiometric and substoichiometric amounts of Zn(ClO4)2?6H 2O and the ligand H5ccdp, in the presence of K 2CO3 or Et3N, afforded a mononuclear zinc complex, [Zn(H2O)6][Zn(H2ccdp)(H 2O)2]2?12H2O (1). The solid state structure of 1 contains two units of the zinc-ligand anion, [Zn(H 2ccdp)(H2O)2]-, and one [Zn(H 2O)6]2+ counter cation. The Zn(II) center of the anion is in a distorted octahedral geometry. However, in methanol, the reaction of ZnSO4?7H2O and the ligand H 5ccdp in the presence of NaOH afforded a unique μ6- sulfato hexanuclear zinc complex, Na6[Zn6(ccdp) 3(μ6-SO4)](OH)?10.5H2O (2). The structure of 2 contains a [ZnII6(μ6- SO4)] core unit which is held together by three heptadentate bridging ligands, ccdp5-. Three of the Zn(II) centers are in highly distorted square pyramidal geometry, the other three Zn(II) centers are in a distorted octahedral geometry. The Royal Society of Chemistry 2008.

Hydrolytically active tetranuclear [NiII2]2 complexes: Synthesis, structure, spectroscopy and phosphoester hydrolysis

Three tetranuclear nickel(ii) complexes, [Ni4(H2chdp)2(H2O)4]Br2·4CH3OH·3H2O (1), [Ni4(H2chdp)2(H2O)4](PF6

Crystal structure of gluconate bound iron(iii) complex: Synthesis, characterization and redox properties of the complex in aqueous solution

A novel tetra-iron(iii) complex, K6[Fe4(ccdp)2(μ-O)(μ-OH)(D-GluA)2](NO3)3·10H2O (K6[1](NO3)3·10H2O) with two gluconato and two N,N′-bis[2-carboxobenzomethyl]-N,N′-bis[carboxomethyl]-1,3-diaminopropan-2-oxy (ccdp5-) ligands has been synthesized and fully characterized using different techniques including single crystal X-ray crystallography. K6[1](NO3)3·10H2O showed stability aqueous solution, in biological samples such as human and fetal bovine serum (HS and FBS) and cell cultures such as phosphate buffer saline and minimum essential medium (PBS and MEM) using UV-Vis spectroscopy at room temperature and 37 °C. The redox behavior of the complex was studied using cyclic and square wave voltammetries in aqueous and DMF solutions. Furthermore, magnetic study using electron paramagnetic resonance spectroscopy and Guoy balance magnetic moment measurements indicated antiferromagnetic coupling among the metal centers of the (μ-O)(μ-OH) bridged tetra-iron(iii) anion core of the complex. Electrochemical studies of the K6[1](NO3)3·10H2O in aqueous and DMF solutions using cyclic and square-wave voltammetries revealed the presence of multi-accessible electron metal-based redox events.

Synthesis, characterization, and spectroscopic investigation of new iron(III) and copper(II) complexes of a carboxylate rich ligand and their interaction with carbohydrates in aqueous solution

New tetra-iron(III) (K4[1]·25H2O·(CH3)2CO and K3[2]·3H2O·(OH)) and di-copper(II) (Na3[3]·5H2O) complexes as carbohydrate binding models have been synthesized and fully characterized used several techniques including single crystal X-ray crystallography. Whereas K4[1]·25H2O·(CH3)2CO and Na3[3]·5H2O are completely water-soluble, K3[2]·3H2O·(OH) is less soluble in all common solvents including water. The binding of substrates, such as Dmannose, D-glucose, D-xylose, and xylitol with the watersoluble complexes in di ff erent reaction conditions were investigated. In aqueous alkaline media, complexes K4[1]·25H2O·(CH3)2CO and Na3[3]·5H2O showed coordination ability toward the applied substrates. Even in the presence of stoichiometric excess of the substrates, the complexes form only 1:1 (complex/substrate) molar ratio species in solution. Apparent binding constants, pKapp, values between the complexes and the substrates were determined and specific mode of substrate binding is proposed. The pKapp values showed that D-mannose coordinates strongest to K4[1]·25H2O·(CH3)2CO and Na3[3]·5H2O. Syntheses, characterizations and detailed substrate binding study using spectroscopic techniques and single crystal X-ray diffraction are reported.

Synthesis, structure, spectroscopic characterization, and protein binding affinity of new water-soluble hetero- and homometallic tetranuclear [Cu II2ZnII2] and [CuII 4] clusters

Two new water-soluble hetero- and homometallic tetranuclear clusters, Na4[Cu2Zn2(ccdp)2(μ-OH) 2]·CH3OH·6H2O (1) and K 3[Cu4(ccdp)2(μ-OH)(μ-OH 2)]·14H2O (2), have been synthesized in methanol-water at room temperature by exploiting the flexibility, chelating ability, and bridging potential of a carboxylate-rich dinucleating ligand, N,N′-bis(2-carboxybenzomethyl)-N,N′-bis(carboxymethyl)-1,3 diaminopropan-2-ol (H5ccdp). Complex 1 is obtained through the self-assembly of two monoanionic [CuZn(ccdp)]-fragments, which are, in turn, exclusively bridged by two μ-OH-groups. Similarly, complex 2 is formed through the self-assembly of two monoanionic [Cu 2(ccdp)]- species exclusively bridged by one μ-OH - and one μ-OH2 groups. Complexes 1 and 2 are fully characterized in the solid state as well as in solution using various analytical techniques including a single-crystal X-ray diffraction study. The X-ray crystal structure of 1 reveals that two CuII centers are in a distorted square-pyramidal geometry, whereas two ZnII centers are in a distorted trigonal-bipyramidal geometry. The solid-state structure of 2 contains two dinuclear [Cu2(ccdp)]- units having one CuII center in a distorted square-pyramidal geometry and another CuII center in a distorted trigonal-bipyramidal geometry within each dinuclear unit. In the powder state, the high-field EPR spectrum of complex 1 indicates that two CuII ions are not spin-coupled, whereas that of complex 2 exhibits at least one noninteracting CuII center coordinated to a nitrogen atom of the ligand. Both complexes are investigated for their binding affinity with the protein bovine serum albumin (BSA) in an aqueous medium at pH ～7.2 using fluorescence spectroscopy. Synchronous fluorescence spectra clearly reveal that complexes 1 and 2 bind to the active sites in the protein, indicating that the effect is more pronounced toward tyrosine than tryptophan. Density functional theory calculations have been carried to find the Fukui functions at the metal sites in complexes 1 and 2 to predict the possible metal centers involved in the binding process with BSA protein.

Zinc(II) complexes of a versatile heptadentate ligand as phosphohydrolase structural and functional mimics

A mono-nuclear [Zn(H2O)6][1] and a di-nuclear zinc (NMe4)2[2] complexes of a carboxylate-rich ligand, N,N′-Bis[2-carboxybenzomethyl]-N,N′ -Bis[carboxymethyl]-1,3-diaminopropan-2-ol (H5ccdp) have shown