The hydrogen bonding between cis,cis,cis-1,3,5,7-tetrahydroxy-1,3,5,7-tetraisopropylcyclotetrasiloxan e and diisopropyl-silanediol results in the formation of a nano-sized tube-like aggregate. The outer diameter of the aggregate was 11.6 Angstrom and the tube-like structure extended infinitely parallel to the ac plane.