Chatt

Analogous to the classification of Lewis acids and bases in hard and soft species, Ahrland et al. have su ested a division of donors and acceptors into classes a and 6. See Ahrland, S. Chatt, J. Davies, N.R. Quart. Rev. 1958, 77, 265... 

J. Chatt, P. L. Paulson, and L. M. Venanzi, "Metal Carbonyls and Related Compounds," io H. Zeiss, ed., Organometallic Chemisty, ACS Monograph 147, Reiohold Pubhshiog Corp., New York, 1960. 

J. Chatt and H. R. Watson, Complexe.s of zerovalent transition metals with the ditertiary phosphine, Me2PCH2CH2PMe2, J. Chem. Soc. 2545-9 (1962). 

Chatt, L M as C Pivu oil R L RcHaRls. Wen IrenJi ni lit CVie iiifjs of iVilneen FitttiA. Aiidenie Pre.v l.ondon, liXO. 2sa pp... 

First thionitrosyl (NS) complex isolated by J. Chatt and J. R. Dilwonh. 

These are of two main types compounds of M", which for platinum have been known since the beginning of this century and commonly involve the stable [PtMes] group and compounds of the divalent metals, which were first studied by J. Chatt and co-workers in the late 1950 s and are commonly of the type [MR2L2] (L = phosphine). In the Pt" compounds the metal is always octahedrally coordinated and this is frequently achieved in interesting ways. Thus the trimethyl halides, conveniently obtained... 

Features (2) and (3) are explicable in terms of the Dewar-Chatt-Duncanson model for bonding in alkene complexes (Figure 3.63), which involves... 

The chemistry of the disilenes (disilaethenes) has developed very rapidly since the discovery of stable compounds. It was an obvious challenge to explore also the possibility of a n-coordination of disilenes to transition metals. According to the Dewar-Chatt-Duncason bonding model, a high stability for a disilene complex should result. 

The lobes of electron density outside the C-O vector thus offer cr-donor lone-pair character. Surprisingly, carbon monoxide does not form particularly stable complexes with BF3 or with main group metals such as potassium or magnesium. Yet transition-metal complexes with carbon monoxide are known by the thousand. In all cases, the CO ligands are bound to the metal through the carbon atom and the complexes are called carbonyls. Furthermore, the metals occur most usually in low formal oxidation states. Dewar, Chatt and Duncanson have described a bonding scheme for the metal - CO interaction that successfully accounts for the formation and properties of these transition-metal carbonyls. 

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