Left hand resonance form best represents polarity, right hand resonance form best represents bond length and strength (triple bond).
Sources of information
edit- J. Phys. Chem. A (2005) 109, 5129–5135: "Thermodynamic Properties of Molecular Borane Amines and the [BH4−][NH4+] Salt for Chemical Hydrogen Storage Systems from ab Initio Electronic Structure Theory"
- J. Phys. Chem. (1991) 95, 3502–3506: "Infrared matrix isolation characterization of aminoborane and related compounds"
- J. Chem. Phys. (1987) 87, 6331-6333: "Detection of HBNH by infrared diode laser spectroscopy"