Characterization of the charge-transfer reaction between decamethylferrocene and 7,7,8,8,-tetracyano-p-quinodimethane (1:1). The iron-57 Moessbauer spectra and structures of the paramagnetic dimeric and the metamagnetic one-dimensional salts and the molecular and electronic structures of (TCNQ)n(n = 0, -1, -2)