Aggregation behavior of unsubstituted magnesium porphyrazine in monolayers at air–water interface and in Langmuir–Schaefer films

Abstract

The aggregation behavior of unsubstituted magnesium porphyrazine (MgPz) was studied in layers at the water–air interface and in Langmuir–Schaefer films. Regions of existence and characteristics of the structure and properties of stable nanostructured monolayers of MgPz were determined with the method of quantitative analysis of compression isotherms of floating layers in a wide range of initial surface coverage degrees (ISCD). MgPz on the water surface forms monolayers of three types: a face-on type and two edge-on types that differ in the structure. The specific feature of the monolayers of the second type is the independence of the structure of two-dimensional MgPz nanoparticles formed on water on the ISCD. A mathematical model and a state diagram of the monolayer were constructed and a passport of MgPz monolayers was compiled. For the first time, the state diagram contains boundary isotherms based on data obtained from the model. Langmuir–Schaefer films of MgPz formed from layers of various types were prepared and studied by UV-vis absorption spectroscopy.

Supermolecular Nanoentities of Vitamin B12 Derivative as a Link in the Evolution of the Parent Molecules During Self-Assembly at the Air–Water Interface

“…The structure of the floating layers was analyzed within the framework of an original model and method for quantitative analysis of compression isotherms of nanostructured M-monolayers. Details can be found in the Supporting Information (Note 2) and in previous works. , The structure and other characteristics of the floating layers were calculated and described in the Supporting Information (Note 3). The data were analyzed by using Origin version 7.5.…”

“…Details can be found in the Supporting Information (Note 2) and in previous works. 34,36 The structure and other characteristics of the floating layers were calculated and described in the Supporting Information (Note 3). The data were analyzed by using Origin version 7.5.…”

“…We previously demonstrated the possibility of supramolecular designing at the air–water interface by controlled self-assembly of porphyrins into 2D and 3D nanostructures. − Here, the concept of nanostructuring of organic compounds at the air–water interface and a model of a floating layer, the structural units of which can be both individual molecules (Langmuir’s approach, special case) and their major nanostructures (so-called M-nanostructures, general case), were presented . The formation of the porphyrin supermolecules from magnesium porphine, a functional element of chlorophyll, was reported …”

High Reactivity of Supermolecular Nanoentities of a Vitamin B12 Derivative in Langmuir–Schaefer Films Toward Gaseous Toxins

“…Nowadays, nanostructures of numerous biomolecules having different properties from those of the parent molecules and with great potential for various applications have been reported. , Self-assembly is a key player in material nanoarchitectonics, − the nanostructures formed in this way arising from molecules carrying side groups that promote the process. Supramolecular polymers have been created using diverse self-assembly strategies. , The formation of different kinds of molecular assemblies from precursor compounds at the water surface has been reported. , We previously demonstrated the possibility of supramolecular design at the air–water interface by controlling the self-assembly of tetrapyrrole compounds into 2D and 3D nanostructures. − The concept of nanostructuring of organic compounds at the air–water interface and a model of a floating layer, the structural units of which can be both individual molecules (Langmuir’s approach, special case) and their major nanostructures (so-called M-nanostructures, general case), were presented. − The formation of the porphyrin supermolecules from magnesium porphine, a functional element of chlorophyll, was reported …”

An Influence of Copper Cation in the Complex on Structure of the Nanostructured Layers, Spectral and Electrocatalytic Characteristics of Langmuir-Schaeffer Films of Triphenylcorrole

“…[14][15][16][17] It was shown that porphyrins and their derivatives are capable to form stable M (Major)-nanoaggregates 5-20 nm in size at the air-water interface. [18][19][20][21] In our previous studies we demonstrated that the supramolecular design with controlled self-organization of organic compounds in 2D and 3D nanostructures at the air-water interface becomes possible if quantitative information about the structure of the floating layer is available. The quantitative method for analyzing of compression isotherms of floating layers allows determination of the critical characteristics of the layers.…”