Thegem-Diol Form of (py)2CO as a Ligand in Cobalt(II) Carboxylate Clusters: A Cubane Complex and a Novel Nonanuclear Species with a Vertex-Sharing Double Square Pyramidal Structure

Abstract

A vertex-sharing double square pyramid of cobalt(II) ions (see picture) is present in the nonanuclear complex 1, obtained by treating cobalt acetate with 0.5 equivalents of (py )CO. The corresponding 1:1 reaction gave 2, which has a central core with a cubane structure. py=pyridine.

Secondary building units, nets and bonding in the chemistry of metal–organic frameworks

“…70). 168 However, the central Ni is replaced with a Na atom, and threecoordinated F atoms bridge the Na atom to the Ni atoms. The twist is such that the SBU is now a square antiprism.…”

A Nonanuclear Iron(II) Single‐Molecule Magnet

“…We had previously reported the synthesis of the nonanuclear cobalt( II ) complex [Co 9 (OH) 2 (O 2 CMe) 8 {(2‐py) 2 CO 2 } 4 ] ( 1 ),17 which comprises two μ 4 ‐OH − ions, and the replacement of these two bridges by two μ 4 :η 1 (that is, end‐on) N 3 − ions to yield the related azido complex18 [Co 9 (N 3 ) 2 (O 2 CMe) 8 {(2‐py) 2 CO 2 } 4 ]( 2 ). The latter retains all the structural features of the former, but exhibits a ground‐state spin seven times that of 1 , due to dominant ferromagnetic interactions introduced by the end‐on azido ligands.…”

Nona- and undecanuclear nickel phosphonate cages

“…When (2-(9H-carbazol-9-yl)propyl)phosphonic acid was used in the reaction system, no good crystals formed. The coligand (py) 2 CO shows the doubly deprotonated anion gem-diol form ((py) 2 CO 2 2À ) in both cages [13] The trying to obtain hemiketal form [(py) 2 C(OR)(OH)] of (py) 2 CO in other solvents such as MeOH does not succeed. Ligand (py) 2 CO is important for the formation of title nickel clusters.…”