CP/M mode

In the 128 mode, the 40/80 DISPLAY key selects which screen mode is used as the default. This key is checked at power-on, when RUN/STOP-RESTORE is pressed, or when the RESET button (found next to the power switch) is pressed. This key has no meaning in 64 mode since 80 columns are not available, again for the sake of compatibility. In either 128 or CP/M mode, the same VIC chip used on the 64 displays 40 columns, graphics, and sprites. The 40-column screen can be seen only on a television or composite monitor, not on the RGB display. 

One of the three operating modes of the Commodore 128 is the CP/M mode, utilizing a Z80 microprocessor. Commodore owners have generally not paid much attention to CP/M, and though it has been available for the 64 for some time now, many people still don t know what it is or what it does. 

Why bother with CP/M at all There are many good CP/M word processors, but there are several word processors for the 64 mode that are every bit as good. Enterprising programmers will surely write sophisticated word processors and business software to take advantage of 80 columns and 128K. 

But in addition to great games and utilities, you ll find discussions of programming in BASIC and writing adventure games, and a special section on the new features of the 128 CP/M, BASIC 7.0, 128 mode, and the peripheral ports. 

Ru-O distances which are 212 pm in both complexes. For [Cp M(H20)3] (M = Rh, Ir) there is an even more dramatic increase of the water exchange rate constant (14 orders of magnitude) when compared with the corresponding hexaaqua-ion [M(H20)6p. This increase in reactivity is also related to a mechanistic changeover from an mechanism towards a more dissociative activation mode. In both cases the rhodium compound is significantly more reactive than the iridium one. 

Phenyl-2,2 6, 2"-terpyridine reacts with [ Cp M(ju-Cl)Cl)2] (M = Rh, Ir) in methanol with sodium tetrafluoroborate to yield mononuclear cationic 9 (M = Rh, Ir) with the bidentate coordination mode and fluxional behavior of the ligand (98POL299). 1,4-Bis(2,2 6, 2"-terpyridyn-4 -yl)benzene with the same rhodium(III) and iridium(III) precursors forms dinuclear 10 (M = Rh, Ir) where the polypyridine ligand is still bidentately coordinated and fluxional. 

The metals bonded to two cyclopentadienyls (Cp) in a pentahapto mode form the metallocenes (see Chap. 11 also describing the Cp-M orbitals). In many other families of compounds, the metal is bonded to only one Cp or derivative. Common examples of this category include ternary families containing, besides the Cp-type ligand, carbonyls, phosphines, nitrosyls, hydrides, 0x0, imido, methyls, etc. - ... 

In each Cp, there are five p orbitals and as shown for structure 2.43, in the most common rf-mode of bonding, they all are used. The energies of the five highest occupied molecular orbitals (HOMOs) of Cp M complexes are very close to each other. Based on the electron occupancy of these orbitals, magnetic properties and variation in the distances of the centers of the Cp rings from the metal atoms can be easily explained. 

The case of C-coordinated oxazole, 21, was reported in organoiron chemistry (89JOM(372)287). Another example involves the interaction of the cyano complexes [M(CN)(Cp)(dppe)] (M = Fe, Ru) or [(rj -Cp)Fe(dppe)(CNH)]Br with gem-dicyanoepoxide to afford the oxazol-2-yl complexes with the C-coordination mode (96JCS(D)3231). 

The mode of binding was characterised by replotting experimental data obtained from binding isotherms in terms of the Scatchard representation, [Me +Jb / (Cp.[Me2+]f) vs [Me2+]b/Cp where [Me2+]f corresponds to the final ion concentration at equilibrium. Metal ion concentrations were here expressed in molarity and Cp in number of chain.l l (using the weight-average molecular weights M,). 

As anticipated by its ML2X2 formulation (Table 4.52), the computed structure of singlet nickelocene approximates a square-planar di-allylic coordination mode. We can deconstruct each r 3-Cp to Ni interaction into an electron-pair bond (M—X) with the radical carbon and a dative interaction (M—L) with the 7icc bond, symbolized as shown below with a half-filled circle ( >) to represent the radical site and a filled circle ( ) to represent the dative 7t-bond site ... 

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