The Hurricanes were looking for help on the blue-line after losing veteran Bret Hedican to injury last week, joining the likes of Frantisek Kaberle and Tim Gleason on the sidelines and leaving Carolina short-handed.
"With some uncertainly concerning when our injured defencemen will be able to return, we needed to make this move now," said Hurricanes GM Jim Rutherford. "Dennis will be a good fit for us on defence. We thank Kevyn for his good service during his years in Carolina."
Seidenberg, 25, had been a healthy scratch in recent games with the Coyotes. With Nick Boynton set to come back Tuesday night for the Coyotes after missing six weeks with a broken foot, Phoenix needed to move a blue-liner.
"Dennis Seidenberg is a valuable NHL defenceman, he's young, and I'm sure has a lot of good years ahead of him," Coyotes GM Mike Barnett said Monday. "But if there's anywhere where we have any depth it's on the blue-line and it wasn't serving us any purpose having to pay him and make him a healthy scratch. And it wasn't helping his career, either."
Seidenberg had one goal and one assist in 32 games with the Coyotes this season. The German has 33 points (8-25) and 56 penalty minutes in 158 career NHL games with Philadelphia and Phoenix.
Adams, a checking centre, had 72 points (38-34) in 300 games with the Hurricanes over the past five years.
"Being in Carolina a number of years, winning a Stanley Cup and going through those things, it was an incredible experience and an incredible organization to play for," Adams told The Canadian Press during a break between flights. "But I'm very excited.
"I traded calls with Wayne Gretzky today and spoke to Mike Barnett and I'm just really excited to go to Phoenix. I think I can go in there and help them, on and off the ice.
"I'm just thrilled about it."
The gritty centre, a solid penalty killer, has two goals and two assists in 35 games this season.
"Kevyn Adams was a piece that was instrumental in Carolina winning the Stanley Cup last year," said Barnett. "He's a veteran, an aggressive, hungry forward that will bring more leadership to our group. And he's very versatile."