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2 Homometallic Alkoxides

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Table 6.12 Potassium aryloxides<br />

Metal Aryloxides 515<br />

Bond length ( ˚A)<br />

Compound Aryloxide M–O Ref.<br />

[(dicyclohexano-18-crown-6)K2⊲ 2-<br />

OAr⊳2]n<br />

6-coord. K<br />

2-OC6H5 2.591 (1), 2.611 (2) i<br />

[(dicyclohexano-18-crown-<br />

6)K(OAr)(HOAr)]n<br />

8-coord. K, OAr hydrogen bonded to<br />

HOAr coordinated to next K-atom<br />

OC6H5.HOC6H5 3.103 (4) ii<br />

[K⊲ 2-OAr⊳⊲THF⊳3]2<br />

6-coord. K, bridging OAr and THF<br />

2-OC6H2⊲CF3⊳3-<br />

2,4,6<br />

2.752 (3), 2.833 (3) iii<br />

[K(OAr)]n<br />

8-coord. K, polymeric structure<br />

2-OC6H2⊲NO2⊳3-<br />

2,4,6<br />

2.738 (1) iv<br />

[(18-crown-6)K(OAr)]<br />

OC6H2⊲NO2⊳3-2,4,6 2.741 (3) v<br />

8-coord. K<br />

cis-syn-cis-[(dicyclohexano-18crown-6)K(OAr)]<br />

7-coord. K<br />

cis-syn-cis-[(dicyclohexane-18-<br />

crown-6)K(OAr)]<br />

cis-anti-cis-[(dicyclohexano-18crown-6)K(OAr)]<br />

7-coord. K<br />

OC6H4⊲NO2⊳-4 2.660 (?) vi<br />

OC6H4⊲NO2⊳-2 2.660 (?) vii<br />

OC6H4⊲NO2⊳-2 2.628 (?) vii<br />

i M.E. Fraser, S. Fortier, A. Rodrigue, and J.W. Bovenkamp, Can. J. Chem., 64, 816 (1986).<br />

ii M.E. Fraser, S. Fortier, M.K. Markiewicz, A. Rodrigue, and J.W. Bovenkamp, Can. J. Chem.,<br />

65, 2558 (1987).<br />

iii S. Brooker, F.T. Edelmann, T. Kottke, H.W. Roesky, G.M. Sheldrick, D. Stalke, and K.H.<br />

Whitmire, J. Chem. Soc., Chem. Commun., 144 (1991).<br />

iv J.M. Harrowfield, B.W. Skelton, and A.H. White, Aust. J. Chem., 48, 1311 (1995).<br />

v J.C. Barnes and J. Collard, Acta Cryst. C, 44, 565 (1988).<br />

vi L.R. Caswell, J.E. Hardcastle, T.A. Jordan, I. Alam, K.A. McDowell, C.A. Mahan, F.R. Fronczek,<br />

and R.D. Gandour, J. Inclusion Phenomena, 13, 37 (1992).<br />

vii F.R. Fronczek, R.D. Gandour, L.M.B. Gehrig, L.R. Caswell, K.A. McDowell, and I. Alam, J.<br />

Inclusion Phenomena, 5, 379 (1987).<br />

Table 6.13 Rubidium and caesium aryloxides<br />

Bond length ( ˚A)<br />

Compound Aryloxide M–O Ref.<br />

[Rb(OAr)]n<br />

8-coord. Rb, polymeric structure<br />

[Cs(OAr)]n<br />

8-coord. Cs, polymeric structure<br />

[Cs(OAr)]n<br />

infinite chains with Cs–O<br />

and Cs- 6-arene interactions<br />

2-OC6H2⊲NO2⊳3-2,4,6 2.927 (3), 3.189 (3) i<br />

2-OC6H2⊲NO2⊳3-2,4,6 3.087 (3), 3.372 (3) i<br />

2-OC6H3Pri 2-2,6 2.875 (4), 2.898 (5) ii<br />

iJ.M. Harrowfield, B.W. Skelton, and A.H. White, Aust. J. Chem., 48, 1311 (1995).<br />

iiD.L. Clark, D.R. Click, R.V. Hollis, B.L. Scott, and J.G. Watkin, Inorg. Chem., 37, 5700<br />

(1998).

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