Coordinative bonding ability

The UV-vis spectra of ZnTPP are shown in Figure 4. The soret band and Q band of ZnTPP in benzene are 423.0nm, 547.9nm, 586.0nm, the UV-vis spectrum have no change when 2000-fold (mohmol) 5CB was added. It means that 5CB has not coordinate with ZnTPP and the coordinate-bonding ability of 5CB is week. 

Chelants have the ability to take waterborne metal ions such as Ca and Mg (but also Fe and Cu) and produce soluble coordinate bond complexes. Therefore, they can be employed for the control of FW hardness salts and other related problems. 

Organic compound (such as ethylenediamine-tetraacetic acid (EDTA) or nitrilo-triacetic acid (NTA) having the ability to take metal ions in water and produce soluble, coordinate-bond complexes. Chelants are commonly used in BW deposit control treatments and various cleaning formulations. 

Another interesting compound that shows the different bonding abilities of cyclopentadiene is Ti(C5H5)4. In this compound, two of the cyclopentadienyl ions are coordinated as r/5-Csl ls as in... 

Electron donor C=S. Thionic sulfur reacts with Ag(I), 181 183 SbCl3,184 Yb(0), Sm(0),185 188 and complexes such as (Cod)2Ni, (Bpy)(Cod)Ni189 Mo(CO)6190 to yield intermediates for subsequent reactions, gives oxidation reactions191 198 to sulfine and ketone, and forms complexes with metal ions by coordinative bonds,55 199 concerning the donor ability of the C=E group towards dihalogens (see Chapter 8.2). 

The coordinating ability of halide ions toward formation of coordinate bonds with lanthanide ions lies in the order F Cl > Br > I, as expected with typical "hard metal ions (437). The coordination num-... 

By writing about complexes containing triple bonds between phosphorus and transition metals, one has to take into account the triple-bond character of phosphinidene complexes which are in a nearly linear coordination mode (type C) in contrast to the usual bent coordination mode D possessing typical double-bond features. Due to the additional r-donation bonding ability of the PR moiety to the metal atom in type C and the observed bond lengths, this type of complexes has to be included into the classes of metal-phosphorus triple bond compounds. Thus, at the end of this review will appear a chapter highlighting the appropriate compounds of type C. 

Mossbauer isomer shifts are strongly related to the back-bonding ability of the ligand known from a comparative study of NO, CO, PR3, and SR2 ligands in six-coordinate iron complexes (104), which explains the change in the observed isomer shifts of the [Fe(NO)(cyclam-ac)F compound series ( = 0.02, 0.28, and... 

The solvating ability of solvents depends not only on their general polarity, which is a non-specific property, but in a large part to their ability to interact in a specific manner with the solute. This may take place by the donation of a nonbonding pair of electrons from a donor atom of the solvent towards the formation of a coordinate bond with the solute, therefore exhibiting Lewis basicity, or the acceptance of such a pair from a solute, an exhibition of Lewis acidity of a protic or protogenic solvent towards the formation of a hydrogen bond between it and... 

The ability of a solvent to donate a pair of electrons of one of its donor atoms towards the formation of a coordinate bond with an acceptor atom of a solute is a measure of its Lewis basicity. Several methods have been proposed over the years to express this donor ability or donicity, but only few of them have proved to be viable and of any real usefulness. 

The electron acceptor numbers (AN) can be used as a measure solvent ability to take a share in the electron pairs from suitable donors. They are defined by means of a different experimental procedure on the basis of the NMR chemical shifts of phosphorous which are produced on transfer of EtsPO through solvents. AN values are scaled from an arbitrarily chosen value of zero for the shift produced by hexane (or 1,2-dichloroethane) to one hundred for the shift produced by the 1 1 EtsPO—SbCls adduct in 1,2-dichloroethane. An estimation of the coordinate bond energy is possible by making use of the formula after Gutmann [155]... 

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