Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Safety of Titanocenedichloride, Which mentioned a new discovery about 1271-19-8
The series of complexes Cp2TiY[(mu-OCH2C5H4)Cr(CO)2(NO)] (Y = C1 (1), Br (2), or CH3 (3)) and Cp2ZrY[(mu-OCH2C5H4)Cr(CO)2(NO)] (Y = CH2Ph (4) or (mu-OCH2C5H4)Cr(CO)2(NO) (5)) were prepared from the reactions of (HOCH2C5H4)Cr(CO)2(NO) with suitable Group 4 metallocene derivatives. The IR spectra of complexes 1-5 show that the v(CO) and v(NO) shift to lower frequencies relative to the values for (HOCH2C5H4)Cr(CO)2(NO). This observation indicates more pi-backbonding from the chromium metal center to the two CO and the NO ligands upon complexation of (OCH2C5H4)Cr(CO)2(NO) to the early metal. The complex 1 crystallizes in the monoclinic P 21/n space group with cell parameters a = 11.274(2) A, b = 13.135(3) A, c = 13.091(3) A, beta = 105.46(3), z = 4, R = 0.045, Rw = 0.054 and Gof = 1.23. The slightly long C-O and N-O distances, the considerably weak Ti-O bond and the upfield shift of the 1H and 13C chemical shifts of C5H4 group also support the argument of net electron flow from OCH2 group to C5H4 group in which the cumulated electron density would pass to the chromium metal center and then pi-backbonding to the CO and NO ligands for the observation of lower energies of v(CO) and v(NO) bands.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI