123.45 is not a legal air to air 'chat' frequency - anywhere.
"VHF air-to-air frequencies enable aircraft engaged on flights over remote and oceanic areas out of range of VHF ground stations to exchange
necessary operational information and to facilitate the resolution of operational problems." Not baseball scores et.c.
The air bands are extremely congested, hence the need to split the bands up into smaller spacing between frequencies.
Try reading
this for instance.
Whilst in the military I occasionally needed to to use a VHF air-air frequency for large formation comm's. I had to get specific clearance from the CAA on a case by case basis, and when granted this was strictly limited by geographic and altitude limitations.