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, zirconium, hafni- um, niobium, tantalum (d°) 20-33, molybdenum, tung- sten (d1) 8-11 and iron (d5) 37, 38 complexes. Indeed, strongly splitted multiplets in the ranges 8 . 8 4 1 - 1 0 . 4 2 0 MHz and 6 . 4 3 8 - 1 0 . 3 3 8 MHz were found in the spectra of niobium and tantalum complexes, respectively; the high-lying frequencies should be assigned to the chlo- rine atoms involved in secondary bonding. Unfortunate- ly, this part of the spectrum could not be recorded for all complexes due to the low frequency intensity. Type III. Dimeric Complexes with a Chlorine