The meeting on the sidelines of the UN General Assembly included US Ambassador Samantha Power, who attendees said noted how the recent violence in Kenya was the result of years-long neglect of the crisis in neighbouring Somalia.
Central African Republic borders some of the most tumultuous countries on the continent, and some fear the state of near-anarchy will allow rebels and other armed groups to flourish there.
She called it a "forgotten crisis" and said the country is collapsing outside the capital, Bangui.
The meeting followed a call from French President Francois Hollande on Tuesday for the UN Security Council to support a plan to authorise logistical and financial support for the African Union peacekeeping force in Central African Republic.
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French Foreign Minister Laurent Fabius yesterday said the country's situation threatens regional peace and security as a "gray zone, a stateless zone, a zone without backbone."
The country nestled among neighbours that include Congo, Chad and Sudan has a long history of chaos and coups.
In March, a coalition of rebel groups joined forces to overthrow the president and put their leader in charge. The rebels have been blamed for abuses including widespread looting, killings, rapes and conscription of child soldiers.
The diplomats emerged yesterday with "very clear commitments" to the urgency of building up the force, plus financial commitments including 10 million euros from France, Georgieva told reporters.
"I don't doubt that the meeting today represents a turning point in the future of my country," said Nicolas Tiangaye, a longtime opposition leader who is still serving as prime minister under rebel leader-turned-president Michel Djotodia. "There was a moment where we thought we were forgotten by the entire world.