Synthesis, spectral properties and supramolecular dimerisation of heteroleptic triple-decker phthalocyaninato complexes with one outer crown-substituted ligand

Behaviour of Low-Symmetry Crown-Phthalocyanine in Solution: Concentration Aggregation vs. Cation-Induced Assembly

“…[43] Studies of aggregation of symmetrical tetra-crownsubstituted phthalocyanines M[(15C5) 4 ) [45][46][47][48] evidence that their interaction with potassium ions can be described as a process with nonlinear cooperativity -binding of first cation by two receptor molecules results in formation of dimeric species, which are preorganized for stronger subsequent binding of next three cations with the formation of highly stable eclipsed dimers -{2M[(15C5) 4 Pc]·4K + }. [22,40] The investigation, performed herein, supports this mechanism -indeed, the dimer, where phthalocyanine molecules are linked just with one potassium ion, already has conformation close to eclipsed. This is due to synergetic effect of ion binding and intramolecular stacking interaction, which results in formation of supramolecular dimer with high stability constant.…”

“…[32] However, in our case the presence of crown ether fragment in molecule affords one more way to control molecular assembly, namely, interaction with alkali metal ions. [2][3][4]18,39,40] To perform studies of cation-induced aggregation of H 2 [(15C5)(BuO) 6 Pc], we have used spectrophotometric titration of the phthalocyanine dissolved in CHCl 3 /CH 3 CN (3:1 vol.) mixture by solution of KOAc in CH 3 CN.…”

(24-Сrown-8)-Linked Dimeric Phthalocyanines and Their Metal Complexes

“…[7][8][9][10][11][12][13][14] The stability of metal complexes with these classes of ligands allows to mention them as promising molecules for the development of novel homogeneous catalysts [15][16][17][18][19] as well as efficient receptors and sensors. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] The dimeric phthalocyanines, linked by rigid or labile linker are in the scope of modern research. [8,10] The origin of the linker, its geometry and rigidity allows development of ditopic molecules with particular arrangement of phthalocyanine fragments -linear, angular or cofacial.…”

Electrochemically controlled multistability of ultrathin films of double-decker cerium phthalocyaninates

“…1b). We have previously shown that unsubstituted lanthanum bisph thalocyaninate La[Pc] 2 can be used as an effective phthalocyaninates-dianion donor in the synthesis of sandwich heteroleptic lanthanide phthalocyaninates [38][39][40][41]. It was found that in the presence of M(acac) 3 in refluxed 1 chloronaphthalene the rapid (5-10 min) quantitative in situ generation of monophthalocyani nate (Pc)Ln(acac) takes place [2], this compound can then react with other phthalocyanines with the forma tion of mixed sandwich complexes.…”