Unusual parallel and inclined interlocking modes in polyrotaxane-like metal-organic frameworks

We describe here two unusual polyrotaxane-like metal-organic frameworks of [Co(2)(1,3-bix)(2)(bpea)(2)] 1 and [Cd(4)(1,4-bix)(4)(bpea)(4)] center dot 4H(2)O 2, where both species contain loops and rods that are interlaced in a highly rare parallel'' fashion in 1, but, uniquely, in an inclined'' fashion in 2.