2. True/false questions. Decide whether each of the following statements is true

Question

2. True/false questions. Decide whether each of the following statements is true. For each answer, provide a short justification with 3 sentences or less. (total: 15 points) (0) All paramagnetic organometallic compounds cannot be detected by NMR spectroscopy because the paramagnetism relaxes all excited nuclei too rapidly. (5 points) m The organometallic complex shown below, Cardiolite, is an important heart imaging agent. if one of the isonitrile ligands is substituted by PMes, the C-N vibrational frequency of one of the remaining isonitriles should decrease. (5 points) MeoMe OMe Me MeO Me MeO (ili) Schrock carbynes are isolobal to organic nitriles. (S points)

Explanation / Answer

i) false. Because NMR SPECTROSCOPY is based upon magnetic moment of neucleus.but not on the propoties of electron.Nmr is not affected by the paramagnetic or diamagnetic of the complex.

ii) True. PMe3 is weak pi acceptor.hence it reduce the electron density less on metal.thus metal form back bonding effectively with cyanide ligang.so M-C bond order increases and C- N bond order decreases.hence C-N Vibrational frequency decreases.

iii) false.

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