10368-90-8Relevant academic research and scientific papers
Copper(II) and nickel(II) complexes of an N-pendent bis-(cyanoethyl) derivative of an isomeric hexamethyl tetraazamarocyclic ligand: Synthesis, characterization, electrolytic behavior and antimicrobial studies
Dey, Lucky,Rabi, Saswata,Hazari, Saroj Kanti Singh,Roy, Tapashi Ghosh,Buchholz, Axel,Plass, Winfried
, (2021)
Hexamethyl derivative salt of the fourteen membered tetraazamacrocycle, Me6[14]diene.2HClO4 (L.2HClO4) has been synthesized by the condensation of ethylenediamine with acetone in presence of quantitative amount of perchloric acid. This diene ligand salt on reduction with NaBH4 followed by extraction with CHCl3 at pH above 12 resulted in a mixture of isomeric ligands, Me6[14]anes which were separated by fractional crystallization from xylene and designated by ‘tet-a’ and ‘tet-b’. Interaction of ‘tet-b’ with excess of acrylonitrile yielded an N-pendent derivative ‘tet-bx’ in which two cyanoethyl groups were attached on less crowded two trans-N atoms. Interactions of nickel(II) acetate tetrahydrate and copper(II) perchlorate hexahydrate with ‘tet-bx’ followed by subsequent addition of NaClO4·6H2O and HClO4 in case of nickel(II) produced square planar orange [Ni(‘tet-bx’)](ClO4)2 and six coordinated octahedral reddish purple [Cu(‘tet-bx’)(ClO4)2] complex respectively. The axial addition reactions on [Ni(‘tet-bx’)](ClO4)2 with NCS, NO3, NO2, Cl, Br and I afforded different colored six coordinated octahedral axial addition products: violet [Ni(‘tet-bx’)(NCS)2]; violet [Ni(‘tet-bx’)(NO3)(ClO4)]; green [Ni(‘tet-bx’)(NO2)(H2O)](ClO4); brown [Ni(‘tet-bx’)(ClO4)Cl]; brown [Ni(‘tet-bx’)(H2O)Br](ClO4) and pink [Ni(‘tet-bx’)(ClO4)I] respectively. All compounds have been characterized by different analytical and spectroscopic parameters. The antimicrobial activities of the concerned ligand and its complexes have been investigated against different bacteria and fungi.
Formation and homolysis of a mononuclear cobalt-oxygen adduct
Bakac, Andreja,Espenson, James H.
, p. 2273 - 2278 (1990)
The macrocyclic cobalt(II) complex (H2O)nCo(C-meso-Me6[14]aneN4) 2+ (L2Co2+) binds oxygen to yield L2CoO22+. The rate constants for the binding and release of O2 in aqueous solutions at 25°C have values 5.0 × 106 M-1 s-1 and 1.66 × 104 s-1, respectively. There is no evidence for the formation of a binuclear μ-peroxo complex. The ESR parameters of the oxygen adduct in toluene at 120 K, g∥ = 2.108, g⊥ = 1.96, A∥, = 3.81 × 10-3 cm-1, A⊥ = 2.94 × 10-3 cm-1, are consistent with the formulation of the complex as a 1:1 adduct with the unpaired spin density residing on the oxygen. The laser flash photolysis of L2CoO22+ (λirr 490 nm) induces the cleavage of the cobalt-oxygen bond, L2CoO22+ →hv L2Co2+ + O2.
Self-assembly of dPS-liquid crystalline diblock copolymer in a nematic liquid crystal solvent
Park, Soo-Young,Kavitha, Thangavelu,Kamal, Tahseen,Khan, Waliullah,Shin, Taegyu,Seong, Baekseok
, p. 6168 - 6175 (2012)
A diblock copolymer dPS(9.1K)-b-LCP(7.2K), the number in parentheses represents the number-averaged molecular weight) with a deuterated polystyrene (dPS) block connected to a side group liquid crystal polymer [poly(6-(4′-cyanobiphenyloxy)hexyl acrylate, LCP] was self-assembled into ～78 A spherical micelles with a dPS core and LCP corona in a small-molecule nematic liquid crystal solvent, 4-pentyl-4′-cyanobiphenyl (5CB). The micellar structures were examined by small angle neutron scattering (SANS) at various block copolymer concentrations and temperatures. The SANS data was analyzed further using a curve fitting method. The critical micelle concentration (CMC) was as low as ～0.0027 wt % and the self-assembled micelles were dissociated reversibly into a unimer state at 33 °C, which is lower than the nematic to isotropic transition temperature (Tni) of 5CB (36 °C). The entropic penalty imposed on the dPS by the ordered nematic state of the LC solvent caused phase separation of the flexible dPS block to form micelles and vanished above the Tni of the LC solvent. A low CMC of ～0.0027 wt % suggests that 5CB was a strong selective solvent for dPS-b-LCP in the nematic state. The global orientation of 5CB, produced by a magnetic field (MF, 1.2 T) revealed the structure of the dPS core of the micelle to be prolate (elongated sphere) oriented with the long axis along the applied MF direction.
Synthesis, characterization, and antibacterial studies of some vanadium complexes with hexamethyl tetraazamacrocycles
Debanath, Eshita,Dey, Benu Kumar,Palit, Debashis,Rabi, Saswata,Roy, Tapashi Ghosh,Shil, Ratul Kumar
, (2022/03/27)
The hexamethyl tetraazacyclotetradecadiene diperchlorate ligand salt, Me6[14]diene.2HClO4 (L1.2HClO4) on reduction yielded two isomeric C-chiral ligands “tet-a” and “tet-b”. Open air reactions of the ligands, L1.2HClO4, “tet-a,” and “tet-b” with vanadyl acetylacetonate produced octahedral green complexes, [VOL1(acac)](ClO4), [VO(“tet-a”)(H2O)](ClO4)2, and [VO(“tet-b”)(acac)](ClO4), respectively, in which vanadium was in +4 oxidation state. The complex [VOL1(acac)](ClO4) underwent axial substitution with KCNS, KBr, KI, and NaNO2 in the ratio of 1:12 in ethanol to yield axial substitution products, [VOL1(SCN)](ClO4)2, [VOL1Br](ClO4)2, [VOL1I](ClO4)2, and [VOL 1 (NO2)](ClO4)2, respectively, in which vanadium was in +5 oxidation state. On the other hand, [VO(“tet-b”)(acac)](ClO4) underwent simultaneous axial substitution and anion exchange reactions with KCNS and KBr in the same ratio to furnish corresponding vanadium(V) complexes, [VO(“tet-b”)(SCN)](SCN)2 and [VO(“tet-b”)Br]Br2, respectively. These complexes were characterized on the basis of elemental, spectroscopic, magneto-chemical, and conductometric analyses. The antibacterial activities of the ligands and their complexes have been investigated toward different Gram-positive and Gram-negative bacteria.
Preparation of a new metallomicelle catalyst for the hydrolysis of bis(4-nitrophenyl) phosphate
Xie, Jia-Qing,Li, Ci,Wang, Min,Jiang, Bing-Ying
, p. 365 - 371 (2013/08/24)
A new metallomicellar system containing cerium(III), a macrocylic polyamine ligand, and the nonionic surfactant Brij35(polyoxyethylene(23) lauryl ether) was prepared and used as a catalyst in the hydrolysis of bis(4-nitrophenyl) phosphate (BNPP). Catalyti
Dimerisation of C-Alkyl Derivatives of 2,3,6,7-Tetrahydro-1H-1,4-Diazepine on Polyalkyl-1,4,8,11-tetra-azacyclotetradeca-4,11-dienes
Kasprzyk, Stanislaw P.,Kolinski, Ryszard A.
, p. 151 - 157 (2007/10/02)
Dimerisation of the seven-membered Schiff bases 1, by ring opening and subsequent ring closure, on the fourteen-membered Schiff bases salts 2 or complexes 3 was carried out in the presence of perchloric acid or nickel(II) perchlorate.The same dimerisation, followed by reduction to 1,4,8,11-tetra-azacyclotetradecanes (4), occurs in the presence of sodium borohydride.The greatest thermodynamic stability of fourteen-membered compounds in the reaction system (Scheme 1) is considered to be a driving force of the reaction.
