text: Yo, check it out, we got nitrate solutions,
  Mg(NO(3))(2), Ca(NO(3))(2), Sr(NO(3))(2), and Pb(NO(3))(2) in the house, no illusions.
  We're diggin' deep with Raman spectroscopy,
  And MD simulations bringin' free energy profiles, so you can see.
  
  Analyzing the modes, we got vibrations,
  In-plane deformation, symmetric and asymmetric sensations.
  Them nitrate ions feelin' the disturbance,
  From metal cations and water molecules, it's emergent.
  
  Pb(2+) be rockin' the contact ion pairs,
  With nitrate, it forms strong bonds, no one compares.
  Sr(2+), Ca(2+), and Mg(2+) laggin' behind,
  Contact ion pair formation, they can't find.
  
  Cation size decreasin', charge density increasin',
  Pb(2+) on top, the trend's pleasin'.
  Sr(2+), Ca(2+), Mg(2+), they fall short,
  Pb(2+) reigns supreme, holdin' down the fort.
  
  Mg(2+), it's a different story in the mix,
  Water molecules got it hydrated, no tricks.
  No contact ion pairin', no bondin' with nitrate,
  Mg(2+)-OH(2) modes showin' its fate.
  
  Free energy profiles backin' up the facts,
  Solvent-separated, solvent-shared, contact ion pairs attract.
  Especially for Mg(2+), it's clear to see,
  Distinguishing it from the other cations, that's the key.