Coordinate linkage

Incorporation of coordinatively active complementary (functional) groups (in the host and the guest molecule) is an essential part of the coordinatoclathrate idea (see Sect. 2.2). In other words, in the absence of functional groups (Fig. 13), a so-called coordinatoclathrate is unimaginable. Also, under these circumstances coordinative linkage of the host molecules with each other to form a recticular matrix is not applicable (see. Sect. 2.1). 

The third approach, this one by Seyferth, is based on the coordinative linkage of borane cage structures by diamines or phosphines to form soluble oligomers (9.21), followed by pyrolysis (reaction (20)).66-68 Pyrolysis in an inert atmosphere gives a 70-90% ceramic yield of a black boron carbonitride, but pyrolysis in ammonia yields white BN in 70% yield. A disadvantage of a process based on a borane starting material is its high cost. 

Phthalocyaninato ( -pyrazine)iron(II) (76) - a stable polymer with coordinative linkage - was obtained by reacting /3-FePc with an excess of pyrazine in chlorobenzene... 

Evaporating Al(OH)Pc and Ga(OH)Pc with aqueous HF led after heating to fluoroaluminium and fluorogallium phthalocyaniM polym s [Al(F)Pc] , [Ga(F)Pc] (7P)125-j28) jjjg polymers were purified by sublimation. The bond between the Pc in the staple is described as combined covalent coordinative linkage. 

These mechanistic possibilities require further investigation. Some examples of how the reaction is influenced by the structure of the olefin, the catalyst, and the solvent are given. In the presence of MX(CO)(PPh3)2 (M = Rh, Ir X = Cl, I), the oxidation of a-and /3-methylstyrenes and cis- and frans-stilbenes permitted the establishment of an activity sequence dependent on the catalyst and the stucture of the olefin. The solvent effect has been studied in the Ru complex-catalyzed oxidation of styrene and methylstyrene. In the presence of a Rh or Ir complex, the oxidation of tetramethylthylene is very selective" and takes place at a faster rate than those of the less-substituted olefins. It emerges from this that a significant role is not played by the coordinative linkage between the metal center and the olefin. Examinations have also been made on the oxidation activities of metallo-porphyrins, for example, the oxidation of cyclohexene with Co and Rh porphyrins. ... 

The study of isomerism depends on kinetic factors limiting the rate of interconversion, and in the 3d series is confined to complexes of Cr111 and Co111 Coordination, linkage, geometrical, and optical isomerism are possible. 

Change in the Mode of Ligand Coordination - Linkage Isomerization... 

PANI/NaFe Pj2 whisker and PANI/NaFe P nanowire composite were prepared by an in-situ compoxmding method [23]. From the TEM images of the composite particles (Figure 6.13), it is found that PANI grew perpendicularly to the surface of NaFe P skutterudite and formed a unique brush structure. Infrared spectra and thermal gravity analyses indicated that there should be a coordinate linkage between one end of PANI liner molecule and the surface of NaFe P, whisker or nanowire. The... 

The same authors used the tridentate chelating sites created by an acyl hydrazide condensed with a pyridyl aldehyde to complex metal ions, thereby combining covalent and coordination linkages within one system. As in their earUer work, luminescent properties of films were changed by simply bringing the films into contact. When two nonluminescent films (polymer 1 and 2, Figure 6.3) were stacked on each other and allowed to blend at moderate temperatures, two... 

Maleic copolymers were proved to form chelates with platinum-containing anticancer drugs (cis-diamminedichloroplatinum(II), trans-l,2-diaminocyclohexane platinum) through a monocarboxylato and a 0->Pt coordination linkage. These complexes self-assembled into nanoparticles with an increased in-vivo tumors inhibition due to their internalization into the cancer cells. The release of the platinum-containing drug was pH dependent [211,212]. 

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