Citation: M. Senyel et al., An infrared spectroscopic study on the Hofmann-diam-type 1,9-diaminononanemetal(II) tetracyanonickelate(II)-aromatic guest clathrates: M(H2N(CH2)(9)NH2)Ni(CN)(4)center dot G (M = Cd or Ni; G = benzene, naphthalene, anthracene or phenanthrene, J INCL P MA, 39(1-2), 2001, pp. 169-174