Bridge chain

Wada and coworkers have recently prepared a number of very similar systems in which the bridging chain is bonded to the benzo group by oxygen . The phenolic ox-... 

The completely synthesized and covalently bridged chains where separated from poly(ethylene glycol) (PEG) by saponification with triethylamine in methanol. 

Chain-bridged cyanines, see Thiazoio-cyanines, chain-bridged Chain-bridged thiazolocyanines, see Thia-zolocyanines, chain-bridged Charge distribution, on methine chain, 72 2-Chloro-3,3-dimethylindolenine, in synthesis of pentamethine thiazolocyanines. 56... 

A thermoset polymer does not flow when it is heated and subjected to pressure. Thermoset polymers consist of an interconnected network of chains that are permanently chemically connected to their neighbors, either directly or via short bridging chains, as shown in Fig. 1.4. We refer to such networks as being crosslinked. Thermoset polymers do not dissolve in solvents, but they can soften and swell. 

Fig. 6 Idealized heptablock copolymer molecular conformations for parallel and perpendicular orientations. The latter contains predominantly bridged chains, whereas the block copolymer is much more likely to loop along interfaces in parallel arrangement. From [44]. Copyright 2004 American Chemical Society...

The lack of secondary Te- -Cl interactions can be correlated with the presence of two aryl substituents with n-donating NMe2 groups. In an opposite way, electron-withdrawing fluorine atoms enhance the Lewis acidity of compounds (RF)2TeX2, leading to fluorine-bridged chains (with X=F) and related chain structures with X=C1 or Br.107... 

X=S or Se. The X=S compound remains HS-HS at all temperatures with weak coupling (/=-4 cm-1) and the X=Se compound shows a broad half-SCO, to the HS-LS state, between 200-100 K, with no hysteresis. Interestingly, attempts to crystallize these compounds led to loss of bipyrimidine and formation of water-bridged chain species [Fe(pypz)2(NCS)2](iU-OH2) n, from which the H-bonded water-bridged dimers described in 2.4.2.4 were developed. 

Variation of the length of the bridging chain —(C>I I2) — shows that both the productivity and molecular weight decrease in the order n = 3>n = 2>n = l, as found for the unsubstituted analogues. 

The A -methylacetamide moiety of U-50488/PD117302 has been subjected to extensive modification. Shortening the bridging chain by one methylene... 

The spectra and redox potentials of the binuclear bismacrocyclic Ni(II) complexes, 17-19 and 20, are similar to those of the corresponding mononuclear complexes of 9 and 3a, respectively. That is, the ligand field strength of the complexes is only slightly affected by the type or the length of bridging chain that links the two macrocyclic units. 

Most of the complexes [NiL] given by the potentially pentadentate ligands (IX) and (X) (Table 97) are five-coordinate high-spin and possess an essentially trigonal bipyramidal structure (320).2320-2322 In contrast with the aforementioned complexes, those formed by the ligands (VIII) which possess the less flexible ethylene bridging chain are essentially square planar.2313,2318... 

Besides the complexes with the various Schiff bases discussed in Sections 50.5.8.1.i-iv and with amino acids (Section 50.5.8.4.ii), nickel(II) complexes containing N,0 chelates amount to hundreds. It is possible that molecules containing every conceivable bridging chain between the N and O donor atoms have been investigated as ligands towards nickel(II). Almost all of these complexes exhibit either square planar or octahedral coordination. 

Dimethylpyrazole (L) has been shown to react with Cd(BF4)2 to give CdL2F2 containing a linear fluoride-bridged chain structure with L completing an octahedral coordination for the Cd.446... 

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