Crystal structure end electron spin echo modulation (ESEEM) study of [Cu(II)(TEPA)NO2]PF6Crystal structure end electron spin echo modulation (ESEEM) study of [Cu(II)(TEPA)NO2]PF6 (TEPA)=Tris[2-(2-pyridyl)ethyl]amine): A model for the purported structure of the nitrite derivative of hemocyanin (TEPA)=Tris[2-(2-pyridyl)ethyl]amine): A model for the purported structure of the nitrite derivative of hemocyanin