Stabilization of Hexaborate Net with Mixed Co(II) Metal and Organic Cations: Synthesis, Rationale Characterization, Comparative Study and Enhancement of the Bioactivity

Abstract

A new Co(II)-hexaborate containing [Co{B 6 O 7 (OH) 6 } 2 ] 2-building blocks decorated with 1-cyanopiperazinium organic cation; (C 5 H 11 N 3 )[Co{B 6 O 7 (OH) 6 } 2 ]Á 4H 2 O (1-CPCoB6) was synthesized from aqueous solution and the crystals were grown by the slow evaporation technique and characterized by means X-ray diffraction, IR UV-Vis and fluorescence spectroscopy measurements, elemental analysis and TDA-TG thermal analysis. The powder and single crystal XRD analysis revealed that the isolated pure crystals belong to the triclinic system. The structure exhibits interesting porous 3D-hydrogen-bonded network built by [Co{B 6 O 7 (OH) 6 } 2 ] 2-monomers. The cyanopiperazinium dications are filled in the free void channels of the inorganic framework and interact by means extensive hydrogen bonds. This hydrated mixed hexaborate thermally decomposed in multiple steps involving dehydration and release of organic cation leading to a novel unknown phase which undergoes crystallization. Moreover, the fluorescent and antimicrobial properties of 1-CPCoB6 have also been carried out, showing a red photoluminescence and a promising enhancement of biological activity of reported material in comparison with its parent reactants.Electronic supplementary material The online version of this article (

Recent advances in crystalline hydrated borates with non-metal or transition-metal complex cations

“…The majority of compounds described in this review have been prepared in aqueous solution by simply mixing reactants [10,[16][17][18][19]25,27,31,[39][40][41][43][44][45]48,50,52,54,56,59,62,75,87,93,95,96,100] or by use of hydrothermal [20,22,26,28,30,32,34,37,47,53,57,[63][64][65][70][71][72]79,82,84,102,115] or solvothermal [35,3...…”

“…the salt[1-cyanopiperazinium][Co{B6O7(OH)6)}2][87]. A derivatised hexaborate(2-), containing three 2-aminoethoxy groups in place of the -OH groups on the three tetrahedral boron centres (Figure 8) functions as a hexadentate(2-) ligand in the complexes [M(NH2CH2CH2O)3B6O7(OH)3] (M = Co, Ni)[88].…”

Transition-metal complexes with oxidoborates. Synthesis and XRD characterization of [(H3NCH2CH2NH2)Zn{κ3 O,O′,O′′-B12O18(OH)6-κ1 O′′′}Zn(en)(NH2CH2CH2NH3)]·8H2O (en=1,2-diaminoethane): a neutral bimetallic zwiterionic polyborate system containing the ‘isolated’ dodecaborate(6−) anion

“…These anions contain numerous fused B-O rings and cages with the 'boroxole'{B3O3} ring system a very common structural motif. Salts containing polyborate anions have attracted recent attention due to their applications as bulk chemicals and possible applications as luminescent, second harmonic generation, ferroelectric, flame retardant and non-linear optical materials [5][6][7][8][9][10][11][12][13][14][15][16].…”

Recent Advances in Crystalline Oxidopolyborate Complexes of d-Block or p-Block Metals: Structural Aspects, Syntheses, and Physical Properties

“…Compound 9 forms 3-D supramolecular network through extensive H-bond interactions. 11) [17] have been recently synthesized and characterized crystallographically. The oxidoborate ligands in 10 and 11 are designated 6:(3Δ+3T) and it is the three hydroxyl O atoms on the three {BO4} centers that coordinate in fac-geometries to the octahedral 19electron Co (II) centers (Figure 4b).…”

“…Many of the compounds described within this review are diamagnetic but those containing Cu (II) (13)(14)(15)(16)(17)(18)(19)(20)(21) and Ni (II) (31-32) centers are paramagnetic. The magnetic properties of the Ni (II) complex 30 have not been reported.…”