Polycyclic 3d-metalchelates formed owing to inner-sphere transmutations in the gelatin matrix: synthesis and structures

Abstract

<jats:title>Abstract</jats:title><jats:p>Processes of synthesis of polycyclic compounds containing various 3<jats:italic>d</jats:italic>-elements, proceeding in gelatin matrix in the systems M(II) ion – (N,S)- or (N,O,S)-containing organic compound <jats:bold>A</jats:bold> – mono- or dicarbonyl-containing organic compound <jats:bold>B</jats:bold>, resulting in one of a variety of inner-sphere transmutations, namely “self-assembly”, have been considered and discussed. The chemical nature of the final products of such a synthesis formed under these specific conditions have been compared with the chemical nature of the final products formed by similar synthesis in solutions. It has been noted that in many cases, the nature and chemical composition of these products differ substantially. Specific features of the density functional theory calculated molecular structures of the metal macrocyclic compounds that can be formed due to such a synthesis in the systems indicated above have been discussed, too. The review covers the period 1990–2016.</jats:p>

Gelatin as It Is: History and Modernity

“…The processes associated with the immobilization of chemical compounds in a gelatin matrix have been considered in a very significant number of original articles, among which we should first of all mention [ 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 155 , 156 , 157 , 158 , 159 , 160 , 161 , 162 , 163 , 164 , 165 , 166 , 167 , 168 , 169 , 170 , 171 , 172 , 173 , 174 , 175 , 176 , 177 , 178 , 179 ]. Very likely, the largest number of works in this direction was associated with the im...…”

“…In this regard, it should be specially noted that in a number of cases, these reactions produce specific chemical compounds, the formation of which does not take place under the traditional conditions for the implementation of the same reactions (i.e., in solution or solid phase) (see, for example, [ 125 , 138 , 140 , 142 ]). A detailed consideration of these specific processes, however, is already beyond the scope of our narrative; review articles are devoted to them [ 123 , 147 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 155 ]. The theoretical foundations of the complexation process in gelatin-immobilized matrix systems are described in [ 156 ].…”

Gelatin Matrix as Functional Biomaterial for Immobilization of Nanoparticles of Metal-Containing Compounds

“…Second: the gelatin matrix is an organizing system, due to which there is an increase in the temperature range in which the process of complex formation and/or template synthesis can be realized. A discussion of the chemistry of these processes, however, is beyond the scope of this article; more detailed information about this can be found in the original papers cited above, as well as in reviews [ 82 , 144 , 145 , 146 , 147 , 148 , 149 , 150 ]. In addition to obtaining gelatin-immobilized metal chelates, the possibility of the immobilization of some other metal-containing chemical compounds, namely, metal sulfides and phosphates in this biopolymer, was considered in the literature at different times, but these studies were only episodic [ 151 , 152 , 153 ].…”