Amino Phthalocyanines Research Articles

Modified reverse degree descriptors for combined topological and entropy characterizations of 2D metal organic frameworks: applications in graph energy prediction.

Topological descriptors are widely utilized as graph theoretical measures for evaluating the physicochemical properties of organic frameworks by examining their molecular structures. Our current research validates the usage of topological descriptors in studying frameworks such as metal-butylated hydroxytoluene, NH-substituted coronene transition metal, transition metal-phthalocyanine, and conductive metal-octa amino phthalocyanine. These metal organic frameworks are crucial in nanoscale research for their porosity, adaptability, and conductivity, making them essential for advanced materials and modern technology. In this study, we provide the topological and entropy characterizations of these frameworks by employing robust reverse degree based descriptors, which offer insightful information on structural complexities. This structural information is applied to predict the graph energy of the considered metal organic frameworks using statistical regression models.

Physicochemical and antimicrobial photodynamic chemotherapy (against E. coli) by indium phthalocyanines in the presence of silver–iron bimetallic nanoparticles

In this work, Schiff base indium phthalocyanines: In–Cl tetrakis N,N-dimethyl-4-(methylimino) phthalocyanine (complex 1b) and In–Cl tetrakis phenoxy N,N-dimethyl-4-(methylimino) phthalocyanine (complex 2b) are synthesized from tetra amino and tetra phenoxy amino phthalocyanines, respectively. These complexes were further quartenised with 1,3-propanesultone to form zwitterionic complexes 1 and 2, respectively. Silver–iron dimers (Ag–Fe3O4) and silver-iron core shell (Ag@Fe3O4) nanoparticles (NPs) were linked to the synthesised complexes. The photophysical and photochemical behaviour of the complexes and their conjugates with NPs were investigated in dimethyl sulfoxide. Complexes 2 and 2b and their conjugates were then used for photodynamic antimicrobial chemotherapy on Escherichia coli. The zwitter ionic photosensitiser 2 and its conjugates showed better efficiency for photodynamic antimicrobial chemotherapy compared to their neutral counterparts.

Electrocatalytic Activity of Nanocomposites of Sulphur Doped Graphene Oxide and Nanosized Cobalt Phthalocyanines

AbstractIn this work we explore the electrocatalytic activity of nanocomposites of reduced sulphur doped graphene oxide nanosheets (rSDGONS) and cobalt phthalocyanine (CoPc) or cobalt tetra amino phthalocyanine (CoTAPc) towards hydrogen peroxide. Transmission electron microscopy, scanning electron microscopy, X‐ray photon spectroscopy, X‐ray diffraction, chronoamperometry, linear scan voltammetry and cyclic voltammetry were used to characterize the nanocomposites. Nanosized CoPc showed superior (in terms of currents) electrocatalytic oxidation and reduction of hydrogen peroxide compared to CoTAPc nanoparticles (CoTAPcNP). The lowest detection limit was obtained for hydrogen peroxide oxidation on electrodes modified with CoPcNP‐rSDGONS at 1.49 µM. The same electrode gave a high adsorption equilibrium constant of 1.27×103 mol−1 and a Gibbs free energy of −17.71 kJ/mol, indicative of a spontaneous reaction on the electrode surface.

Conjugation of mono-substituted phthalocyanine derivatives to CdSe@ZnS quantum dots and their applications as fluorescent-based sensors

Unsymmetrically substituted derivatives of aluminium amino phthalocyanines were synthesized for the first time, fully characterized and conjugated to CdSe@ZnS quantum dots (QDs). The conjugates were employed as fluorescence-based sensors for anion sensing. Among the anions that enhanced the fluorescence of the probe, fluoride ion was chosen as the test ion to test the efficacy of the probe. Förster resonance energy transfer from the QDs to the phthalocyanine was observed as an indication for the fluorescence quenching of the QDs upon binding to the phthalocyanine. The fluorescence of the linked QDs was progressively enhanced, and linearly proportional to increasing concentrations of fluoride ion. The type of substituent attached to the phthalocyanine ring influenced the efficiency of fluorescence enhancement. The proposed nanoprobe has been employed to detect fluoride ion in cell culture medium and tap water.

Synthesis, spectral, magnetic, thermal and antibacterial studies on symmetrically substituted 1,8,15,22-tetra- phenylpropene-1-imino phthalocyanines

This article describes a simple method developed for the synthesis of symmetrically substituted 1,8,15,22-tetra-phenylpropene-1-imino phthalocyanines (M-PhproImPcs) of cobalt(II), copper(II), nickel(II) and zinc(II) by condensing 1,8,15,22-tetra amino phthalocyanines with cinnamaldehyde. The dark bluish-green colored tetraimino substituted phthalocyanine derivatives were characterized by elemental analysis, electronic spectra, IR spectra, magnetic susceptibility, powder XRD and thermogravimetric analysis (TGA) to check the structural integrity and purity. The variations of magnetic moment as a function of field strength indicated the presence of intermolecular co-operative interactions. The complexes were also evaluated for their antibacterial activities.

Photoinduced multi-electron transfer in the Dn–A system consisting of multi-phthalocyanines linked to one carbon nanotube

A Dn-A model in which a carbon nanotube (nanoscaled electron acceptor A) is attached with a number of electron donors (Dn), i.e. amino phthalocyanines, was employed to reveal the different nature of photoinduced electron transfer (PeT) in the nanoscaled model from that of a usual one-to-one linked D-A system, which is known to form the single-charge separation state D*+-A*-via well-studied single-electron transfer. For the Dn-A system, however, a one-step multi-electron transfer from multi donors to the same acceptor occurs simultaneously to generate a long-lived multiple-charge separation state Dn*+-A*n- (n>1), which is desirable for efficiently mimicking PSII in photosynthesis.

Synthesis, structural investigations and biological studies on symmetrically substituted 3,3′,3",3"′-tetra-methoxyphenylimino phthalocyanine complexes

The present paper describes the synthesis and characterization of novel metal (II) 3,3′,3″,3‴-tetramethoxyphenylimino substituted phthalocyanines (M-MeOPhImPcs) of copper (II), cobalt (II), nickel (II) and zinc (II) by condensing the 3,3′,3″,3″′-tetra amino phthalocyanines with anisaldehyde. The dark bluish green colored tetraimino substituted phthalocyanine derivatives were characterized by various physico-chemical techniques like elemental analysis, magnetic susceptibility, electronic, IR, powder X-ray diffraction and thermo gravimetric analysis (TGA) to check the structural integrity and purity. The variations of magnetic moment as a function of field strength indicated the presence of inter molecular co-operative interactions. The complexes were also evaluated for their antifungal and antibacterial activities.

Synthesis, structural investigations and biological studies on symmetrically substituted 4,4′,4″,4″′- tetra-methoxyphenylimino phthalocyanine complexes

The synthesis and characterization of novel metal(II) 4,4′,4″,4″′-tetra-methoxyphenylimino substituted phthalocyanines (MImPc) of copper(II), cobalt(II), nickel(II) and zinc(II) by condensing the 4,4′,4″,4″′-tetra amino phthalocyanines with anisaldehyde are described. The dark bluish green colored tetraimino substituted phthalocyanine derivatives are characterized by various physico-chemical techniques, elemental analysis, magnetic susceptibility, electronic, and IR spectra, powder X-ray diffraction and thermo gravimetric analysis (TGA) to check the structural integrity and purity. The variations of magnetic moment as a function of field strength indicated the presence of intermolecular co-operative interactions. The complexes are also evaluated for their antifungal and antibacterial activities.

Synthesis, characterization and electrical and CO 2 sensing properties of triazine containing three dendritic phthalocyanine

The metal-free phthalocyanine 1a was synthesised by statistically mixed condensation of 4-nitrophthalonitrile and 4-(2-dimethylaminoethylsulfanyl)phthalonitrile in dry 2-(dimethylamino)ethanol. The same route were applied to prepare metal-containing phthalocyanines using metal salts Zn(OAc) 3·2H 2O and CoCl 2, respectively, in dry DMF. The nitro compounds were reduced to amine with sodium sulfide and quarternized by reaction of MeI. These compounds were then reacted with cyanuric chloride in the presence of potassium carbonate as a base in mixture of THF and DMF gave s-triazine containing three amino phthalocyanines 4a– c. The reaction of three phthalocyanines with sodium salt of triethylmethanetricarboxylate in absolute ethanol were synthesised first generation of dendrimer 5a–c. The second generation of dendritic phthalocyanines 6a–c were prepared by the reaction of dentritic phthalocyanines with tris (H 2NC(CH 2OH) 3) using K 2CO 3 as a base in DMSO. The dendritic phthalocyanines containing tris are slightly soluble in water. The new compounds were characterized by elemental analysis and UV–vis, IR, NMR spectra. The temperature dependence of the dc and ac conductivity of these compounds and the adsorption of CO 2 gas on thin film of the compounds were investigated by dc conductivity and impedance spectroscopy technique using an interdigital transducer structure on glass substrate. While exposure to CO 2 have no influence on the electrical conductivity (ac and dc) of compound 6a and 6c, the conductivity of the film of 6b strongly depend on the presence of the CO 2 gas. Completely reversible sensor signals were obtained for compound 6b. The impedance spectra were obtained at frequencies between 40 and 10 5 Hz, and in a wide range of CO 2 concentrations (from 500 to 8000 ppm) at room temperature. The temperature dependence of dc conductivity show typical Arrehenius behaviour for all compounds. The ac conductivity of the films is represented by the form ω s . The dependency of frequency exponent s on temperature suggests a correlated barrier hopping (CBH).

Synthesis and properties of two new N‐alkyl substituted phthalocyanines

AbstractThe synthesis and properties of tetrakis(1,1‐dimethyl‐2‐phthalimido)ethylphthalocyaninato zinc(II) (6) and tetrakis(1,1‐dimethyl‐2‐amino)ethylphthalocyaninato zinc(II) (7) are described. N‐Alkyl substituted phthalonitrile 5 was converted to phthalocyanine 6. which was deprotected to afford the free amino phthalocyanine 7.