Cross-linking metal-containing complex

Neoprene—phenohc contact adhesives, known for thein high green strength and peel values, contain a resole-type resin prepared from 4-/-butylphenol. The alkyl group increases compatibiHty and reduces cross-linking. This resin reacts or complexes with the metal oxide, eg, MgO, contained in the formulation, and increases the cohesive strength of the adhesive. In fact, the reactivity with MgO is frequently measured to determine the effectiveness of heat-reactive phenoHcs in the formulation. 

A novel polysiloxane, containing the isocyanide group pendent to the backbone, has been synthesized. It is observed to react with the metal vapors of chromium, iron and nickel to afford binary metal complexes of the type M(CN-[P])n, where n = 6, 5, 4 respectively, in which the polymer-attached isocyanide group provides the stabilization for the metal center. The product obtained from the reaction with Fe was found to be photosensitive yielding the Fe2(CN-[P])q species and extensive cross-linking of the polymer. The Cr and Ni products were able to be oxidized on exposure of thin films to the air, or electrochemically in the presence of an electron relay. The availability of different oxidation states for the metals in these new materials gives hope that novel redox-active polymers may be accessible. 

Polystyrene and its divinylbenzene cross-linked copolymer have been most widely exploited as the polymer support for anchoring metal complexes. A large variety of ligands containing N, P or S have been anchored on the polystyrene-divinylbenzene matrix either by the bromination-lithiation pathway or by direct interaction of the ligand with C1-, Br- or CN-methylated polystyrene-divinyl-benzene network [14] (Fig. 7). 

Heavy metal compounds used to treat cancer include cisplatin, carboplatin, and oxaliplatin (see Table 36-6). These drugs, which contain platinum, are also known as platinum coordination complexes.10,27 Heavy metal drugs act like the alkylating agents that is, they form strong cross-links between and within DNA strands,... 

As shown in Table III, supported Mo catalysts may be derived not only from the traditional Mo02(acac)2, Mo naphthenate, or Mo(CO)6 precursors. A yellow Mo peroxide complex, synthesized from Mo metal and hydrogen peroxide, was immobilized on a cross-linked polystyrene functionalized with triethylenetetramine (229). This Mo-containing material was capable of catalyzing the epoxidation of various olefins with t-BuOOH as the oxidant in the temperature range of 298-333 K. For example, cyclohexene oxide was obtained in 90% yield after 5 h of reaction at 333 K in benzene. 

Linear amino polymers containing basic nitrogen atoms are critically reviewed with regard to their synthesis, protonation and complex formation in solution with metal ions. Cross linked resins having essentially the same structure as linear polymers, are also mentioned. As far as the proto-nation is concerned, special care has been given to thermodynamic aspects, and to the most probable protonation mechanism. Complexing abilities of these polymers have been evaluated through stability constants and spectroscopic parameters. Practical implications of the properties have been considered. 

The spectra of clathrochelate cobalt(III) tris-dioximates obtained by cross-linking with chromium, nickel, and zinc(II) complexes, alongside the bands assigned to the n-n transitions in dioximate fragments, contained the d-d transition bands from the capping metal ions that masks the corresponding transitions for the central Co3+ ion [46]. 

The structure of SnBr2 is at present being studied that of Snl2 is a unique AX2 structure of unexpected complexity which is shown in projection in Fig. 26.11. One-third of the Sn atoms (Sn ) are in positions of nearly regular octahedral coordination in rutile-like chains which are cross-linked by double chains containing the remaining metal atoms. The latter (Sn") form 5 shorter and 2 longer bonds to I atoms ... 

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