Question

#1

The stretching frequencies for the dioxygen complexes of oxyhemocyanin and oxyhemerythrin are observed at 744 cm-1 and 844 cm-1 respectively. This means that the dioxygen oxyhemocyanin complex is __________, and the dioxygen oxyhemerythrin complex is __________.

peroxo, superoxo |

superoxo, peroxo |

superoxo, superoxo |

peroxo, peroxo |

#2

The following IR absorptions are measured for NO stretching in the following porphyrin complexes. Which of the following complexes would have the smallest M-N-O angle?

Complex A: 1720 cm-1 |

Complex B: 1689 cm-1 |

Complex C: 1625 cm-1 |

Complex D: 1780 cm-1 |

Complex E: 1610 cm-1 |

Answer #1

#1 The stretching frequencies for the dioxygen complexes of oxyhemocyanin and oxyhemerythrin are observed at 744 cm-1 and 844 cm-1 respectively. This means that the dioxygen oxyhemocyanin complex is __________, and the dioxygen oxyhemerythrin complex is __________.

peroxo, peroxo

#2 Given the following IR absorptions are measured for NO stretching in the following porphyrin complexes. The following complexes would have the smallest M-N-O angle

Complex A : 1720 cm-1

and

Complex D: 1780 cm-1

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